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ishmael

New Member

• Feb 23, 2006

• #1

hiya, another stupid question... my landy (series 3, 109, ex military) has bridgestone 235/85R16 tyres fitted, which look a fair bit bigger than others i have seen. i *think* that 205/75R16 is standard, which i think means my gearing is increased by 14%. now i understand this to mean that i should go faster for a given number of revs, but with less "power". also, my speedo will be wrong, surely? and by how much? 14% i can manage, but is it likely to be more than that?

there'll be another stupid question along in a bit.

 

Gareth Coe

New Member

• Feb 23, 2006

• #2

Standard military 109 tyres are 7.50 x 16. That's the old way of describing it - I'm not sure how this translates into the new speak.
You're right in principle, though: bigger (diameter) than standard tyres will give you more speed and less power. Haven't a clue about that percentage thingy. Bigger front tyres could also foul the bodywork when steering.

 

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ishmael

New Member

• Feb 23, 2006

• #3

found a site that reckoned that older spec tyres couldn't manage profiles less than 1, so a 7.50R16 has a width and a depth of 7.5 inches. this would give a total diameter of 31 inches. my bridgestones have a diameter of just under 32 i reckon, so there should be very little difference. i can stop worrying about that now and start finding something else. like why have i got an 88" brake system on my 109"?

cool site, btw gareth.

 

Ashoofack

New Member

• Feb 23, 2006

• #4

Ishmael, where was the site that you got the tyre info from? sound interesting. Although not as interesting as your brakes! What year is your 109?

 

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ishmael

New Member

• Feb 24, 2006

• #5

Ashoofack said:

Ishmael, where was the site that you got the tyre info from? sound interesting. Although not as interesting as your brakes! What year is your 109?

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i'll have to have a look on monday when i'm in work (in work looking at landrover websites, that is...) my 109 is 73, but it wasn't released from the MoD until 86(?) - M Reg. hence all sorts of "interesting" features - like the 88" braking system...

 

Gareth Coe

New Member

• Feb 24, 2006

• #6

ishmael said:

cool site, btw gareth.

Click to expand...

Heidi says "Thank you" Now, why didn't you leave a message in the guestbook?

 

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ishmael

New Member

• Mar 2, 2006

• #7

Ashoofack said:

Ishmael, where was the site that you got the tyre info from? sound interesting. Although not as interesting as your brakes! What year is your 109?

Click to expand...

i know i said monday, but anyway:

http://www.4wdonline.com/Wheels/Tyres.html