I bought a used 2003 bmw z4 roadster with the 3.0i and am extremely happy about it...love it in fact.
it seems that whomever had it before me put on 245 40 18's in the back and replace all the tires with non-runflats... which I would have done anyway.
Today I bought 255 35 18's (which the tire place told me is stock size for that vehicle, and I confirmed with tirrack.com) the only problem is now my tire pressure light is on and I dont know what to do...
what is the next step? how come this light was not on before when the previous owner removed the run-flats?
