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Old 07-13-2008, 05:26 AM
equ equ is offline
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Location: Dogville
Join Date: Aug 2004
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Mein Auto: Something or other
Originally Posted by Orient330iNYC View Post
being completely honest, i'm not too worried-- its not exact on any of the other models. and of course its a temporary spare.

there's even a varience between the front and rear wheels with staggered tires... as well as tire wear varience. the rears will wear out faster than the fronts.

most modern traction control systems can handle 2-3% differences in diameters.

a 125/80/17 spare tire would be almost spot on, but i dont think a 4" rim will take a 125 tire ok.

also-- a runflat tire running on zero pressure has more a diameter difference than the temp spare (the FTM system doesnt trip until there's about a 10-15% diameter difference)
Generally agreed, a few % off (ideally below 2-4) should be ok. 10-15% diameter difference is huge. I think you mean, 10-15% pressure/PSI difference.

Are you planning to mount/test?
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