different tyre diam front and back?

[predator]

This is probably a silly question, but can I get away with slightly wider *diameter* (not width) tyres on the back?

I have 205/60R15's on the front on my old R31, and I have a 'give away' price on some 205/65R15's.. On my calculations that would make the rears 2cm larger rolling diameter.

Would this totally stuff up my steering geometry and handling ? I have a feeling its not a good idea, but I really just need to put these on to pass a RWC so I can sell the car..

[C_DawG]

A 5% profile difference wont cause any problems.

[RiverSide]

Won't be an issue........I have had 17" rims on front and 18" rims on rear woth quite a substanstial overall rolling diameter difference and it never posed a problem.

[Whale_Ryda]

give it a whirl!

[predator]

yeah, I picked up a pair of 205/65R15's yesterday.. will get them puton friday.. I wonder whether the tyre shop will whinge at me when they go to balance it all..

[predator]

got them installed the other day..

No problems at all. I can't notice any difference in handling at all. The car does sit a little bit higher at the back than the front if you really look at it, but that kind of suits the wedginess of an R31 anyway

At a couple of tyre shops - looks like more common size is 205/65 anyhow.. 205/60 i think is a bit of an oddity.