tyres

whitstella · Mar 19, 2015

Hi

Right I've got a few tyres knocking around and I was wondering if I could mix them a bit. I've got a 110 and I've got 235 70 16 mud tyres and I've got 2 235 70 16 and 2 245 70 16 all terrain will I be able to use these on different axles?

Cheers steve

tottot · Mar 19, 2015

mikescuba · Mar 20, 2015

tottot said:
Yes

!!!!!!!!!!!!!!. Err, are you sure mixing 235 with 245. I was always lead to believe you had to keep the same tire sizes with about the same amount of tread otherwise you would get transmission wind up.

zeaphod · Mar 20, 2015

The different types of 235/70 should be ok mixed. 245/70 will have a different rolling radius and should not be mixed with 235/70. IMHO.

MayorQuimby · Mar 20, 2015

They are the same profile. I rreckon the difference in rolling radius would be miniscule

FlyingPete · Mar 20, 2015

735mm diameter for the 235s, 750mm for the 245s, a difference of 2%. Should be ok with the diff lock off but the diff will be constantly compensating for the difference in speeds. Always best to keep the diameters the same.

boguing · Mar 20, 2015

Just done a bit of 'rithmetic that I've meant to do for a while.

If you do a full circle in a 90 the outside front will travel 50 Metres, whilst the rear inner will only travel 38.6 Metres. That's roughly 25% difference (and the centre diff will be dealing with 80% of that).

In other words, in normal use your front wheels will always do more miles than the rears.

I've just done a quick and dirty calc for my 10 Mile there and back trip into town, and the number of complete circles I've turned is nine, which gives a 1% difference in distance travelled front/rear.

The disappointing thing is that you can't 'average' the wear out, either on the tyres or the diffs, so although fitting FlyingPete's larger wheells on the front would reduce diff wear on the bends, it would increase it on the straights.

So there you have it. Same size tyres are best, but fit the largest on the front if you have to have different ones. Regardless of that, your fronts travel further, usually carry more weight and do more of the braking.

tottot · Mar 20, 2015

The diff is all ways compensating for different speeds like every
time when going around a corner, There will not be any wind up if diffs are open[unlocked] even if tires had a big size variance.

trax · Mar 20, 2015

tottot said:
The diff is all ways compensating for different speeds like every
time when going around a corner, There will not be any wind up if diffs are open[unlocked] even if tires had a big size variance.

afaik, the diff isn't designed for it. corners and small variations.. yes.

constant prolonged usage and the planetary gears (which are going much faster than the wheels) can overheat/wear/fail i believe.

i'm a bit unsure, so it would be interesting to hear from jm or anyone who knows

tottot · Mar 20, 2015

I am not saying the diff would not be subject to more work/wear,just there won't be any wind up.
Diffs work very hard in off road conditions when one wheel is spinning and the other is not, same goes for the center diff when not locked and only front or rear wheels are spinning. Of course center diff should be locked in such conditions but have often seen otherwise.
Never known a diff compleatly wear out, they bust before that happens.

tyres

whitstella

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tottot

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mikescuba

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zeaphod

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MayorQuimby

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FlyingPete

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boguing

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tottot

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trax

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tottot

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