tread depths

mattfletcher · Dec 22, 2010

Hi guys, this has probably been asked before, but done a search and nothing come up.
Just bought some wheels for my p38, only 18s but better than the 16s on it. Ive got two tyres at 6mm of tread and two tyres at 3mm of tread, just wondering whether its likely to cause transmission failure if I fit them? I'm asking as the evo I had was running different tread depths front to back and it cost me a diff. Thanks in advance, as I really want to get them fitted but obviously aint going to if my transmission will fail. lol

Ridesafe · Dec 22, 2010

mattfletcher said:
Hi guys, this has probably been asked before, but done a search and nothing come up.
Just bought some wheels for my p38, only 18s but better than the 16s on it. Ive got two tyres at 6mm of tread and two tyres at 3mm of tread, just wondering whether its likely to cause transmission failure if I fit them? I'm asking as the evo I had was running different tread depths front to back and it cost me a diff. Thanks in advance, as I really want to get them fitted but obviously aint going to if my transmission will fail. lol

It might cause diff probs being so far out; the legal limit is only 1.6mm, but recommended safe minimum is actually 3 (grip, load and braking). If it were my money and safety I'd be putting 2 new tyres on - most are about 7-8mm new so far safer and less likely to cause diff issues as closer in circumference. IMHO !!

zzr1200 · Dec 22, 2010

3mm of tread depth difference will not effect a diff.

If your still worried mix the treads depth's on an axle.

I presume you purchased a set of 4 wheels all the same rim diameter (18") with the same make/size tyres, but different tread depth's........

sharplessb · Dec 22, 2010

are all 4 tyres the same make and model? only ask because 2 different tyres could have different tread depths, the rolling radius should always b the same!

mattfletcher · Dec 23, 2010

The tyres are all pirelli scorpions

wammers · Dec 23, 2010

Will make very little difference and not damage diffs. Put the low treads on the back. Don't forget even with four brand new tyres the TPs in the front are 10 psi less that the rear. So the rolling radius of the rear tyres is always greater than that of the fronts as standard. The centre diff should cope easily. I do have a pet theory that if the TPs were the same front and back you would not see as many VCs failing. But that's another story.

Ridesafe · Dec 23, 2010

wammers said:
Will make very little difference and not damage diffs. Put the low treads on the back. Don't forget even with four brand new tyres the TPs in the front are 10 psi less that the rear. So the rolling radius of the rear tyres is always greater than that of the fronts as standard. The centre diff should cope easily. I do have a pet theory that if the TPs were the same front and back you would not see as many VCs failing. But that's another story.

FWIW ..... I run mine at just 5psi different; Most weight and steering always at front, although rear weight increased when boot full. Tyres are wearing very evenly, handling purrrrrrfik!

mattfletcher · Dec 23, 2010

Thanks for the advice guys, looks like Ill be fitting them tomorrow night in the snow in the dark. Woop woop!!

tread depths

mattfletcher

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Ridesafe

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zzr1200

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sharplessb

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mattfletcher

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wammers

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Ridesafe

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mattfletcher

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