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)
Past: 2001 330i ZSP/ZPP/Step
Past: 2004 S60R 6MT Sport
Past: 2007 335i 6MT ZSP/ZCW/322/655
Past: 2010 335xi ZMP/ZCW/ZPP/PPK/PE
Present: 2013 335i 6MT ZMM/ZDH/ZTP/3AG/494/508
Current Homeland Threat Level:
Last edited by Orient330iNYC; 07-10-2008 at 01:30 PM.