Fitting conventional non-run flat tyres on the existing rims cures this but you need to carry a can of the temporary tyre repair stuff in case of a puncture or get a space saver spare if its not a Cooper S.
As MINIAC says it's tramlining. This is usually caused by heavy or wide rims. MINI's with the 17" S spokes are prone to this as they are so heavy. Not sure if swapping to none run flats alone will cure it, but swapping to lighter rims will. My old Cooper was terrible at it but my current one with lighter 17" wheels has never suffered from it.
I absolutely agree with Humph, I have a set of 17 inch S spokes which I use during the winter (with run-flat Blizzaks which are awesome for snow and ice) and they are much more prone to tramlining than the 17 inch 5-spoke Bullets that I use during the summer.
If you know how many MINIs you have you don't have enough ...
i have just come from a golf gti mk5 to a mini cooper s checkmate, and find the tramlining and twitchy steering really anoying, i have pirrelli runflats all 35psi. how do i get rid of this? poly bushes normal tyres?
Happens with regular tires as well, not just RF's. It does suck... I just switched to an All Season (Bridgestone Potenzas) and so far the trammeling has subsided. I reckon it will be back later though.
Do you have any pics of your 215 40 17 tyres on your car as id like to see how they fit.... i.e. side wall and tread width. Are you saying there as comfy as 205 45 17 non runflats as they are shallower?
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