Quote:
Originally Posted by OliH
Yeah but no but..... The stock tyre is a RFT, so has a harder sidewall, hence non RFT's will have to be run at different pressures,to compensate for not have the same sidewall!!!
|
Correct - remember that our cars are designed with more compliant suspension bushing to account for the rigidity in the runflat tyres - running non-RFT tyres too soft will only increase wallow as the suspension would then be 'soft'.
Incidentally Dave, the pressures of 36F & 38/39R are derived from the Alpina D3 and Alpina B3 cars, both of which use Michelin PS2 Non-RFT as standard on 19" wheels, and both of which ride supremely well...
I also double checked with Alpina to get their opinion on pressures on a regular 335i...