[jackliu0527]

I want to ditch my crappy oem dunlop rft tires soon on my 650 xdrive, and was doing some research and found something interesting

20inch oem tire size is 245/35/20FR and 275/30/20RR, according to factory setup the rear tire has 1.1% less diameter than the front same goes for rolling circumference, which is weird i thought BMW dont recommend >1% difference?

so if i want wider tires do i got with 255/35/20FR and 285/30/20RR? this setup also have 1.1% difference between front and rear

but with 245/35/20FR and 285/30/20RR the diameter is exactly the same between front and rear tires

or 40FR and 35RR aspect ratio? i dont think there is enough clearance for it

has anyone tried any of these setups?