Taller tires - computer recalibration

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"David Kelly" <[email protected]> wrote in message
news:p[email protected]...
> On Wed, 26 Nov 2003 20:39:26 -0500, Mike Romain wrote:
>
> > ROTFLMAO!!!!
> >
> > Man, so why would I want to divide the diameter in half to figure out
the
> > circumference?
>
> Because the tire is 2 * PI radians around. And the circumference is
> 2 * PI * R.
>
> > I don't want the area of the sucker, I want the circumference to figure
> > the % difference from the smaller tire to the larger.
>
> Punch some buttons on your calculator. For percent changed the radius
> works exactly as well as the diameter which works exactly as well as the
> circumference when comparing speedometer/odometer errors.
>
> A high school student in algebra class should be able to explain why.
> Because we are lacking HS algebra graduates I'll explain.
>
> The only difference between circumference and diameter is that diameter is
> multiplied by PI to get circumference. When comparing two tires the
> constant PI can be factored out from both sides of the equation.
>
> Same applies for radius and 2 * PI.
>

Boy I am glad someone else here understands 7th grade math. I was begining
to wonder! <wink>


 

"George" <[email protected]> wrote in message
news:Kqkxb.37179$gr.6848@okepread04...
> Well, Mike, you are right about the thread getting silly. I also don't
care
> about radius or diameter or circumference or any mathematical ****. So
> here's the only way for you to get it. Stand the tires against the wall.
> One tire is 2 inches taller than the other one. The taller tire will
raise
> the truck by ONE INCH!!! The other inch is at the top of the tire. Holy
> ****, this is getting to be some boring reading! However much taller the
> one tire is, divide by 2. It bolts on in the middle!!!!
> .


Which equals the radius, which in his example, equates to just over one half
inch (.6). phew. Perhaps he understands a non mathematical explanation.


 
actually, you should use the 'loaded radius', from the center of the axle to
the fround, with the truck's weight resting on the tire(s)

then compare and divide to get differences


"Mike Romain" <[email protected]> wrote in message
news:[email protected]...
> Ouch, ok.... I give up. LOL!
>
> I like simple stuff......
>
> You know, the 'KISS' principal.
>
> If I put a BFG P235/75 against a wall and a BFG P215/75 against a wall I
> have a 1.2" height difference.
>
> In my mind that makes one tire taller than the other. 'Lots taller'.
>
> The chart at BFG tells me this.
>
> http://www.bfgoodrichtires.com/assets/pdf/radial_long_trail_ta.pdf
>
> So I have a 'diameter' given to me from the tire maker, no radius
> mentioned there....
>
> WHY THE HECK SHOULD I DO ANY FANCY MATH CONVERSIONS WHEN THE FORMULA IS
> SO SIMPLE! (or even need to know more than basic, which I happen to
> anyway)
>
> Excuse me for shouting, but this thread is getting totally silly....
>
> PI times the diameter works for me......
>
> Radius does not come into the equation when figuring out a speedometer
> like the original poster asked about!!!!
>
> The tire makers don't give you radius on the tire charts, they give
> diameter!
>
> Crap guys....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> David Kelly wrote:
> >
> > On Wed, 26 Nov 2003 20:39:26 -0500, Mike Romain wrote:
> >
> > > ROTFLMAO!!!!
> > >
> > > Man, so why would I want to divide the diameter in half to figure out
the
> > > circumference?
> >
> > Because the tire is 2 * PI radians around. And the circumference is
> > 2 * PI * R.
> >
> > > I don't want the area of the sucker, I want the circumference to
figure
> > > the % difference from the smaller tire to the larger.
> >
> > Punch some buttons on your calculator. For percent changed the radius
> > works exactly as well as the diameter which works exactly as well as the
> > circumference when comparing speedometer/odometer errors.
> >
> > A high school student in algebra class should be able to explain why.
> > Because we are lacking HS algebra graduates I'll explain.
> >
> > The only difference between circumference and diameter is that diameter
is
> > multiplied by PI to get circumference. When comparing two tires the
> > constant PI can be factored out from both sides of the equation.
> >
> > Same applies for radius and 2 * PI.


 
'to the Ground'.........damn arthritis


"Gary Glaenzer" <[email protected]> wrote in message
news:eek:Xpxb.326650$Fm2.336021@attbi_s04...
> actually, you should use the 'loaded radius', from the center of the axle
to
> the fround, with the truck's weight resting on the tire(s)
>
> then compare and divide to get differences
>
>
> "Mike Romain" <[email protected]> wrote in message
> news:[email protected]...
> > Ouch, ok.... I give up. LOL!
> >
> > I like simple stuff......
> >
> > You know, the 'KISS' principal.
> >
> > If I put a BFG P235/75 against a wall and a BFG P215/75 against a wall I
> > have a 1.2" height difference.
> >
> > In my mind that makes one tire taller than the other. 'Lots taller'.
> >
> > The chart at BFG tells me this.
> >
> > http://www.bfgoodrichtires.com/assets/pdf/radial_long_trail_ta.pdf
> >
> > So I have a 'diameter' given to me from the tire maker, no radius
> > mentioned there....
> >
> > WHY THE HECK SHOULD I DO ANY FANCY MATH CONVERSIONS WHEN THE FORMULA IS
> > SO SIMPLE! (or even need to know more than basic, which I happen to
> > anyway)
> >
> > Excuse me for shouting, but this thread is getting totally silly....
> >
> > PI times the diameter works for me......
> >
> > Radius does not come into the equation when figuring out a speedometer
> > like the original poster asked about!!!!
> >
> > The tire makers don't give you radius on the tire charts, they give
> > diameter!
> >
> > Crap guys....
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > David Kelly wrote:
> > >
> > > On Wed, 26 Nov 2003 20:39:26 -0500, Mike Romain wrote:
> > >
> > > > ROTFLMAO!!!!
> > > >
> > > > Man, so why would I want to divide the diameter in half to figure
out
> the
> > > > circumference?
> > >
> > > Because the tire is 2 * PI radians around. And the circumference is
> > > 2 * PI * R.
> > >
> > > > I don't want the area of the sucker, I want the circumference to
> figure
> > > > the % difference from the smaller tire to the larger.
> > >
> > > Punch some buttons on your calculator. For percent changed the radius
> > > works exactly as well as the diameter which works exactly as well as
the
> > > circumference when comparing speedometer/odometer errors.
> > >
> > > A high school student in algebra class should be able to explain why.
> > > Because we are lacking HS algebra graduates I'll explain.
> > >
> > > The only difference between circumference and diameter is that
diameter
> is
> > > multiplied by PI to get circumference. When comparing two tires the
> > > constant PI can be factored out from both sides of the equation.
> > >
> > > Same applies for radius and 2 * PI.
>
>


 
Approximately 11/26/03 16:16, Mike Romain uttered for posterity:


> I have no urge to argue with someone that wants to talk in circles.

Eggshually if Jason could *accurately* talk in circles, you wouldn't
be so frustrated with his ignorance.

--
Still a Raiders fan, but no longer sure why.

 

"Lon Stowell" <[email protected]> wrote
>
> > I have no urge to argue with someone that wants to talk in circles.
>
> Eggshually if Jason could *accurately* talk in circles, you wouldn't
> be so frustrated with his ignorance.
>

nice one. How accurate a circle is a tire with weight on it tho?

rhys


 
Approximately 11/27/03 14:11, rnf2 uttered for posterity:

> nice one. How accurate a circle is a tire with weight on it tho?

Depends on how fast it is turning and the load. However given
two tires from the same manufacturer and model differing only
in size, isn't too much of a stretch to presume that these
would be more or less equal, allowing the larger diameter to
be a reasonable WAG for speedometer effect. With the disclaimer
that at higher speeds the circumference grows depending on
construction etc. etc. and that even the tire measurements
given by a manufacturer have a disclaimer that they are
averages and apply only in reference to the rim width
noted, etc. etc. etc. Or more simply, either a change in
radius or diameter may be used to calculate the percent
of speedometer nominal effect given that the other factors
all cancel out. Except for amount of air. And atmospheric
pressure. And pizzas consumed by the driver and passengers.
And fuel load. And speed. And temperature. And fudge
factors. etc.

--
Still a Raiders fan, but no longer sure why.

 

"Lon Stowell" <[email protected]> wrote in message
news:LFrxb.328178$Fm2.337315@attbi_s04...
> Approximately 11/26/03 16:16, Mike Romain uttered for posterity:
>
>
> > I have no urge to argue with someone that wants to talk in circles.
>
> Eggshually if Jason could *accurately* talk in circles, you wouldn't
> be so frustrated with his ignorance.
>


Funny, I have been 100% accurate. Why some people are so threatened by
intelligence is beyond me.



 
Approximately 11/27/03 18:07, Jason Cothran uttered for posterity:

> Funny, I have been 100% accurate. Why some people are so threatened by
> intelligence is beyond me.

Tsk, sad how a minimal level of intellect is required to even
be able to be aware that you have none. Sad.

 

"Lon Stowell" <[email protected]> wrote in message
news:19yxb.236710$mZ5.1792722@attbi_s54...
> Approximately 11/27/03 18:07, Jason Cothran uttered for posterity:
>
> > Funny, I have been 100% accurate. Why some people are so threatened by
> > intelligence is beyond me.
>
> Tsk, sad how a minimal level of intellect is required to even
> be able to be aware that you have none. Sad.
>

Still waiting for anything I have been wrong on instead of childish,
unfounded name calling. Of course that's what those with inferiority
complexes about ignorance do, I have found in my travels. Feel free to relay
any example to email, as I will not be returning to this board, since
knowledge seems to make some people upset (read as jealous?) here.


--

Remove the words 'NO' and 'SPAM' to reply


 
Lon

Don't feel bad about upsetting Jason.. this is a quote of his from
alt.trucks.chevy..

"I must travel on to more intelligent places, as some fools here are
intimidated by knowledge, and I so despise people getting bent out of shape
when they read actualities. I prefer everyone to just get along. Best of
luck, all with of your trucks, and keeps those tires turning!"

This was as a result of a discussion in the aforementioned newsgroup.. that
discussion was about tires too.. worst part is that he may end up in one of
the two Jeep newsgroups..


--
History is only the past if we choose to do nothing about it..

"Jason Cothran" <[email protected]> wrote in message
news:p[email protected]...
>
> "Lon Stowell" <[email protected]> wrote in message
> news:19yxb.236710$mZ5.1792722@attbi_s54...
> > Approximately 11/27/03 18:07, Jason Cothran uttered for posterity:
> >
> > > Funny, I have been 100% accurate. Why some people are so threatened by
> > > intelligence is beyond me.
> >
> > Tsk, sad how a minimal level of intellect is required to even
> > be able to be aware that you have none. Sad.
> >
>
> Still waiting for anything I have been wrong on instead of childish,
> unfounded name calling. Of course that's what those with inferiority
> complexes about ignorance do, I have found in my travels. Feel free to
relay
> any example to email, as I will not be returning to this board, since
> knowledge seems to make some people upset (read as jealous?) here.
>
>
> --
>
> Remove the words 'NO' and 'SPAM' to reply
>
>


 
Not bad post has lasted 5 days so far.
"Jukka" <[email protected]> wrote in message
news:[email protected]...
> Wed, 26 Nov 2003 12:04:05 -0500 Mike Romain <[email protected]>
> wrote:
>
> > Jason Cothran wrote:
> > > A lot taller? 15 mm (just over 1/2 inch) is a lot taller?
> >
> > Yo bud, don't know what the heck you are measuring, but in the BFG line,
> > a P215/75/R15 has a diameter of 27.8".
> >
> > The P235/75/R15 has a diameter of 29.0"
> >
> > Just a wee bit more than a 1/2" eh....
>
> Mike,
> determining tire height with radius suits better for those who
> want more academic conversation and more "convincing" formula.
> They have the joy of multiplying the radius by two to get what
> we know without multiplying, "how tall the tire is", diameter.
>
> --
> Jukka


 
In article <[email protected]>,
[email protected] says...
>
> "Mike Romain" <[email protected]> wrote in message
> news:[email protected]...
> > I would find someone with a GPS and clock it to see.
> >
> > When I went up from the stock 215's to 235's, my speedo was right on. it
> > was off before...
> >
> Going up from a 215 to a 235 will not change the speedo. That is the width
> of the tire in millimeters. The second number is what determines how tall
> the tire is.
>
>
>

75% percent of 235 is more than 75% of 215.
--
____________________
Remove "X" from email address to reply.
 
I work at a tire shop and can say that for Example, you have a 235/75R15,
and a 215/75R15, that the 235 will be TALLER!!!
It would in fact be quite a bit taller, by a couple Inches. Your moving up
2 sizes, since you skipped a 225/75R15.
If you had a 215/75/R15 before and wanted to keep the SAME Height but get a
little wider, then a 225/70R15 would be the tire to get. Or Wider yet with
a 235/65 or 60 R15 Depending on the Brand of tire since they do very from
different Manufactures.

I have P275/45R20 on my own truck. The Height is quite close to the Stock
Chevy P245/75R16" wheels that were on in. Much Wider tire but not a whole
lot of sidewall. Ignoring the Wheel Diameter or either 16" or 20", you
can see that the first number is going up and the Second Number is going
down. So while the height is the same, the tire is wider by quite a bit.
If I needed to replace the stock 245 tires, but want to keep the height but
a little wider, again I'd go with a P255/70R16. The height the same, the
Width a bit wider.

If someone says there want to go up from a 215 to a 235 and don't give the
second # then I and anyone else will assume that the second number is the
SAME. In which case the tire WILL BE A LOT TALLER! A couple inches is a
lot. Your jumping up 2 tire sizes.


"Chris Phillipo" <[email protected]> wrote in message
news:[email protected]...
> In article <[email protected]>,
> [email protected] says...
> >
> > "Mike Romain" <[email protected]> wrote in message
> > news:[email protected]...
> > > I would find someone with a GPS and clock it to see.
> > >
> > > When I went up from the stock 215's to 235's, my speedo was right on.
it
> > > was off before...
> > >
> > Going up from a 215 to a 235 will not change the speedo. That is the
width
> > of the tire in millimeters. The second number is what determines how
tall
> > the tire is.
> >
> >
> >
>
> 75% percent of 235 is more than 75% of 215.
> --
> ____________________
> Remove "X" from email address to reply.


 
Seeing as you are referring to metric sizes, and those numbers are of course
in millimeters.
Measured from widest point to widest point, usaully the sidewall bulge.
Using this example below, the tire will be 15 mm taller, or 1.5 cm, or .59"

"JBDragon" <[email protected]> wrote in message
news:[email protected]...
> I work at a tire shop and can say that for Example, you have a 235/75R15,
> and a 215/75R15, that the 235 will be TALLER!!!
> It would in fact be quite a bit taller, by a couple Inches. Your moving
up
> 2 sizes, since you skipped a 225/75R15.
> If you had a 215/75/R15 before and wanted to keep the SAME Height but get
a
> little wider, then a 225/70R15 would be the tire to get. Or Wider yet
with
> a 235/65 or 60 R15 Depending on the Brand of tire since they do very from
> different Manufactures.
>
> I have P275/45R20 on my own truck. The Height is quite close to the Stock
> Chevy P245/75R16" wheels that were on in. Much Wider tire but not a whole
> lot of sidewall. Ignoring the Wheel Diameter or either 16" or 20", you
> can see that the first number is going up and the Second Number is going
> down. So while the height is the same, the tire is wider by quite a bit.
> If I needed to replace the stock 245 tires, but want to keep the height
but
> a little wider, again I'd go with a P255/70R16. The height the same, the
> Width a bit wider.
>
> If someone says there want to go up from a 215 to a 235 and don't give the
> second # then I and anyone else will assume that the second number is the
> SAME. In which case the tire WILL BE A LOT TALLER! A couple inches is a
> lot. Your jumping up 2 tire sizes.
>
>
> "Chris Phillipo" <[email protected]> wrote in message
> news:[email protected]...
> > In article <[email protected]>,
> > [email protected] says...
> > >
> > > "Mike Romain" <[email protected]> wrote in message
> > > news:[email protected]...
> > > > I would find someone with a GPS and clock it to see.
> > > >
> > > > When I went up from the stock 215's to 235's, my speedo was right
on.
> it
> > > > was off before...
> > > >
> > > Going up from a 215 to a 235 will not change the speedo. That is the
> width
> > > of the tire in millimeters. The second number is what determines how
> tall
> > > the tire is.
> > >
> > >
> > >
> >
> > 75% percent of 235 is more than 75% of 215.
> > --
> > ____________________
> > Remove "X" from email address to reply.
>
>


 
You are mistaken.

On the tires I was referring to, the BFG line, there is a 1.2"
difference in height between a P215x75 and a P235x75 tire of the same
make and type.

See:
http://www.bfgoodrichtires.com/assets/pdf/radial_long_trail_ta.pdf

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Chevguy wrote:
>
> Seeing as you are referring to metric sizes, and those numbers are of course
> in millimeters.
> Measured from widest point to widest point, usaully the sidewall bulge.
> Using this example below, the tire will be 15 mm taller, or 1.5 cm, or .59"
>
> "JBDragon" <[email protected]> wrote in message
> news:[email protected]...
> > I work at a tire shop and can say that for Example, you have a 235/75R15,
> > and a 215/75R15, that the 235 will be TALLER!!!
> > It would in fact be quite a bit taller, by a couple Inches. Your moving
> up
> > 2 sizes, since you skipped a 225/75R15.
> > If you had a 215/75/R15 before and wanted to keep the SAME Height but get
> a
> > little wider, then a 225/70R15 would be the tire to get. Or Wider yet
> with
> > a 235/65 or 60 R15 Depending on the Brand of tire since they do very from
> > different Manufactures.
> >
> > I have P275/45R20 on my own truck. The Height is quite close to the Stock
> > Chevy P245/75R16" wheels that were on in. Much Wider tire but not a whole
> > lot of sidewall. Ignoring the Wheel Diameter or either 16" or 20", you
> > can see that the first number is going up and the Second Number is going
> > down. So while the height is the same, the tire is wider by quite a bit.
> > If I needed to replace the stock 245 tires, but want to keep the height
> but
> > a little wider, again I'd go with a P255/70R16. The height the same, the
> > Width a bit wider.
> >
> > If someone says there want to go up from a 215 to a 235 and don't give the
> > second # then I and anyone else will assume that the second number is the
> > SAME. In which case the tire WILL BE A LOT TALLER! A couple inches is a
> > lot. Your jumping up 2 tire sizes.
> >
> >
> > "Chris Phillipo" <[email protected]> wrote in message
> > news:[email protected]...
> > > In article <[email protected]>,
> > > [email protected] says...
> > > >
> > > > "Mike Romain" <[email protected]> wrote in message
> > > > news:[email protected]...
> > > > > I would find someone with a GPS and clock it to see.
> > > > >
> > > > > When I went up from the stock 215's to 235's, my speedo was right
> on.
> > it
> > > > > was off before...
> > > > >
> > > > Going up from a 215 to a 235 will not change the speedo. That is the
> > width
> > > > of the tire in millimeters. The second number is what determines how
> > tall
> > > > the tire is.
> > > >
> > > >
> > > >
> > >
> > > 75% percent of 235 is more than 75% of 215.
> > > --
> > > ____________________
> > > Remove "X" from email address to reply.
> >
> >
 
You say 6, I say a half dozen. It is 1.2" diameter, or .6" radius
difference.
I had said .59". Sorry I was off.

"Mike Romain" <[email protected]> wrote in message
news:[email protected]...
> You are mistaken.
>
> On the tires I was referring to, the BFG line, there is a 1.2"
> difference in height between a P215x75 and a P235x75 tire of the same
> make and type.
>
> See:
> http://www.bfgoodrichtires.com/assets/pdf/radial_long_trail_ta.pdf
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Chevguy wrote:
> >
> > Seeing as you are referring to metric sizes, and those numbers are of
course
> > in millimeters.
> > Measured from widest point to widest point, usaully the sidewall bulge.
> > Using this example below, the tire will be 15 mm taller, or 1.5 cm, or
..59"
> >
> > "JBDragon" <[email protected]> wrote in message
> > news:[email protected]...
> > > I work at a tire shop and can say that for Example, you have a
235/75R15,
> > > and a 215/75R15, that the 235 will be TALLER!!!
> > > It would in fact be quite a bit taller, by a couple Inches. Your
moving
> > up
> > > 2 sizes, since you skipped a 225/75R15.
> > > If you had a 215/75/R15 before and wanted to keep the SAME Height but
get
> > a
> > > little wider, then a 225/70R15 would be the tire to get. Or Wider yet
> > with
> > > a 235/65 or 60 R15 Depending on the Brand of tire since they do very
from
> > > different Manufactures.
> > >
> > > I have P275/45R20 on my own truck. The Height is quite close to the
Stock
> > > Chevy P245/75R16" wheels that were on in. Much Wider tire but not a
whole
> > > lot of sidewall. Ignoring the Wheel Diameter or either 16" or 20",
you
> > > can see that the first number is going up and the Second Number is
going
> > > down. So while the height is the same, the tire is wider by quite a
bit.
> > > If I needed to replace the stock 245 tires, but want to keep the
height
> > but
> > > a little wider, again I'd go with a P255/70R16. The height the same,
the
> > > Width a bit wider.
> > >
> > > If someone says there want to go up from a 215 to a 235 and don't give
the
> > > second # then I and anyone else will assume that the second number is
the
> > > SAME. In which case the tire WILL BE A LOT TALLER! A couple inches
is a
> > > lot. Your jumping up 2 tire sizes.
> > >
> > >
> > > "Chris Phillipo" <[email protected]> wrote in message
> > > news:[email protected]...
> > > > In article <[email protected]>,
> > > > [email protected] says...
> > > > >
> > > > > "Mike Romain" <[email protected]> wrote in message
> > > > > news:[email protected]...
> > > > > > I would find someone with a GPS and clock it to see.
> > > > > >
> > > > > > When I went up from the stock 215's to 235's, my speedo was
right
> > on.
> > > it
> > > > > > was off before...
> > > > > >
> > > > > Going up from a 215 to a 235 will not change the speedo. That is
the
> > > width
> > > > > of the tire in millimeters. The second number is what determines
how
> > > tall
> > > > > the tire is.
> > > > >
> > > > >
> > > > >
> > > >
> > > > 75% percent of 235 is more than 75% of 215.
> > > > --
> > > > ____________________
> > > > Remove "X" from email address to reply.
> > >
> > >


 
No, I am saying the word 'taller'.

..59 difference in radius is ALMOST the same as 1.2" diameter taller.

It is 'not' .59" 'taller' at all.

No ifs, ands, buts or maybes, the tire is 1.2" taller period!

I don't get why you folks are tossing in an unrelated term when trying
to figure how much 'taller' a tire is.

The manufacturers give the height of the tires to compare on their
charts.

You need this height difference 'that they give you'! to figure out the
circumference difference so you can figure out the speedo difference.

THEY DON'T GIVE A RADIUS MEASUREMENT!

Man it isn't rocket science, it is grade 6 math.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Joe Poitras wrote:
>
> You say 6, I say a half dozen. It is 1.2" diameter, or .6" radius
> difference.
> I had said .59". Sorry I was off.
>
> "Mike Romain" <[email protected]> wrote in message
> news:[email protected]...
> > You are mistaken.
> >
> > On the tires I was referring to, the BFG line, there is a 1.2"
> > difference in height between a P215x75 and a P235x75 tire of the same
> > make and type.
> >
> > See:
> > http://www.bfgoodrichtires.com/assets/pdf/radial_long_trail_ta.pdf
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Chevguy wrote:
> > >
> > > Seeing as you are referring to metric sizes, and those numbers are of
> course
> > > in millimeters.
> > > Measured from widest point to widest point, usaully the sidewall bulge.
> > > Using this example below, the tire will be 15 mm taller, or 1.5 cm, or
> .59"
> > >
> > > "JBDragon" <[email protected]> wrote in message
> > > news:[email protected]...
> > > > I work at a tire shop and can say that for Example, you have a
> 235/75R15,
> > > > and a 215/75R15, that the 235 will be TALLER!!!
> > > > It would in fact be quite a bit taller, by a couple Inches. Your
> moving
> > > up
> > > > 2 sizes, since you skipped a 225/75R15.
> > > > If you had a 215/75/R15 before and wanted to keep the SAME Height but
> get
> > > a
> > > > little wider, then a 225/70R15 would be the tire to get. Or Wider yet
> > > with
> > > > a 235/65 or 60 R15 Depending on the Brand of tire since they do very
> from
> > > > different Manufactures.
> > > >
> > > > I have P275/45R20 on my own truck. The Height is quite close to the
> Stock
> > > > Chevy P245/75R16" wheels that were on in. Much Wider tire but not a
> whole
> > > > lot of sidewall. Ignoring the Wheel Diameter or either 16" or 20",
> you
> > > > can see that the first number is going up and the Second Number is
> going
> > > > down. So while the height is the same, the tire is wider by quite a
> bit.
> > > > If I needed to replace the stock 245 tires, but want to keep the
> height
> > > but
> > > > a little wider, again I'd go with a P255/70R16. The height the same,
> the
> > > > Width a bit wider.
> > > >
> > > > If someone says there want to go up from a 215 to a 235 and don't give
> the
> > > > second # then I and anyone else will assume that the second number is
> the
> > > > SAME. In which case the tire WILL BE A LOT TALLER! A couple inches
> is a
> > > > lot. Your jumping up 2 tire sizes.
> > > >
> > > >
> > > > "Chris Phillipo" <[email protected]> wrote in message
> > > > news:[email protected]...
> > > > > In article <[email protected]>,
> > > > > [email protected] says...
> > > > > >
> > > > > > "Mike Romain" <[email protected]> wrote in message
> > > > > > news:[email protected]...
> > > > > > > I would find someone with a GPS and clock it to see.
> > > > > > >
> > > > > > > When I went up from the stock 215's to 235's, my speedo was
> right
> > > on.
> > > > it
> > > > > > > was off before...
> > > > > > >
> > > > > > Going up from a 215 to a 235 will not change the speedo. That is
> the
> > > > width
> > > > > > of the tire in millimeters. The second number is what determines
> how
> > > > tall
> > > > > > the tire is.
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > > 75% percent of 235 is more than 75% of 215.
> > > > > --
> > > > > ____________________
> > > > > Remove "X" from email address to reply.
> > > >
> > > >
 
Then you should know that you figure out circumference using the radius, not
diameter.

"Mike Romain" <[email protected]> wrote in message
news:[email protected]...
> No, I am saying the word 'taller'.
>
> .59 difference in radius is ALMOST the same as 1.2" diameter taller.
>
> It is 'not' .59" 'taller' at all.
>
> No ifs, ands, buts or maybes, the tire is 1.2" taller period!
>
> I don't get why you folks are tossing in an unrelated term when trying
> to figure how much 'taller' a tire is.
>
> The manufacturers give the height of the tires to compare on their
> charts.
>
> You need this height difference 'that they give you'! to figure out the
> circumference difference so you can figure out the speedo difference.
>
> THEY DON'T GIVE A RADIUS MEASUREMENT!
>
> Man it isn't rocket science, it is grade 6 math.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Joe Poitras wrote:
> >
> > You say 6, I say a half dozen. It is 1.2" diameter, or .6" radius
> > difference.
> > I had said .59". Sorry I was off.
> >
> > "Mike Romain" <[email protected]> wrote in message
> > news:[email protected]...
> > > You are mistaken.
> > >
> > > On the tires I was referring to, the BFG line, there is a 1.2"
> > > difference in height between a P215x75 and a P235x75 tire of the same
> > > make and type.
> > >
> > > See:
> > > http://www.bfgoodrichtires.com/assets/pdf/radial_long_trail_ta.pdf
> > >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > >
> > > Chevguy wrote:
> > > >
> > > > Seeing as you are referring to metric sizes, and those numbers are
of
> > course
> > > > in millimeters.
> > > > Measured from widest point to widest point, usaully the sidewall
bulge.
> > > > Using this example below, the tire will be 15 mm taller, or 1.5 cm,
or
> > .59"
> > > >
> > > > "JBDragon" <[email protected]> wrote in message
> > > > news:[email protected]...
> > > > > I work at a tire shop and can say that for Example, you have a
> > 235/75R15,
> > > > > and a 215/75R15, that the 235 will be TALLER!!!
> > > > > It would in fact be quite a bit taller, by a couple Inches. Your
> > moving
> > > > up
> > > > > 2 sizes, since you skipped a 225/75R15.
> > > > > If you had a 215/75/R15 before and wanted to keep the SAME Height
but
> > get
> > > > a
> > > > > little wider, then a 225/70R15 would be the tire to get. Or Wider
yet
> > > > with
> > > > > a 235/65 or 60 R15 Depending on the Brand of tire since they do
very
> > from
> > > > > different Manufactures.
> > > > >
> > > > > I have P275/45R20 on my own truck. The Height is quite close to
the
> > Stock
> > > > > Chevy P245/75R16" wheels that were on in. Much Wider tire but not
a
> > whole
> > > > > lot of sidewall. Ignoring the Wheel Diameter or either 16" or
20",
> > you
> > > > > can see that the first number is going up and the Second Number is
> > going
> > > > > down. So while the height is the same, the tire is wider by quite
a
> > bit.
> > > > > If I needed to replace the stock 245 tires, but want to keep the
> > height
> > > > but
> > > > > a little wider, again I'd go with a P255/70R16. The height the
same,
> > the
> > > > > Width a bit wider.
> > > > >
> > > > > If someone says there want to go up from a 215 to a 235 and don't
give
> > the
> > > > > second # then I and anyone else will assume that the second number
is
> > the
> > > > > SAME. In which case the tire WILL BE A LOT TALLER! A couple
inches
> > is a
> > > > > lot. Your jumping up 2 tire sizes.
> > > > >
> > > > >
> > > > > "Chris Phillipo" <[email protected]> wrote in message
> > > > > news:[email protected]...
> > > > > > In article <[email protected]>,
> > > > > > [email protected] says...
> > > > > > >
> > > > > > > "Mike Romain" <[email protected]> wrote in message
> > > > > > > news:[email protected]...
> > > > > > > > I would find someone with a GPS and clock it to see.
> > > > > > > >
> > > > > > > > When I went up from the stock 215's to 235's, my speedo was
> > right
> > > > on.
> > > > > it
> > > > > > > > was off before...
> > > > > > > >
> > > > > > > Going up from a 215 to a 235 will not change the speedo. That
is
> > the
> > > > > width
> > > > > > > of the tire in millimeters. The second number is what
determines
> > how
> > > > > tall
> > > > > > > the tire is.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > 75% percent of 235 is more than 75% of 215.
> > > > > > --
> > > > > > ____________________
> > > > > > Remove "X" from email address to reply.
> > > > >
> > > > >


 
In article <[email protected]>, [email protected]
says...
> Then you should know that you figure out circumference using the radius, not
> diameter.
>

You figure out height using the top, not the middle.
--
____________________
Remove "X" from email address to reply.
 
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