I hope the OP doesn't mind if I expand on this. I have a 2013 F30 xDrive Sportline on order with 225/45-18 tires and 18 x 8 wheels all around. I opted for performance summer tires and will be getting the increased top speed limiter.
If I want to switch to high performance all-seasons, would you recommend the RE960AS in the closest available size, 245/40-18? Their diameter is 25.7 while the OEM 225/45-18's are 25.9. If so, would you recommend I go with wider wheels, and would that fit on the F30?
If I was willing to forego run flats, what high performance all season tires would you recommend in the 225/45-18 OEM size?
2013 335i xDrive, Mineral Grey, Sportline, Black/Red leather, Dynamic Handling, Shockware, Sport AT, Performance Tires, Increased Top Speed, Premium Pkg, Cold Weather Pkg, HK audio
2011 X3 35i, Titanium Silver, Black Nevada, Fineline Wave Wood, Premium, Technology, Cold Weather, Dynamic Handling, Sport Activity, 19" wheels, Premium Hi-Fi, Sat Radio