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Overall, I think the 1M will be an incredible car but I'm a bit dissapointed that it is 1/2" taller than the 135i.
I looked up the stock 135i and M3 tires on Tirerack.com the diameters are
135i
F: 215/40R18 diameter = 24.8"
R: 245/35R18 diameter = 25.0"
M3
F: 245/35ZR19 diameter = 25.8"
R: 265/35ZR19 diameter = 26.3"
So the 1M tire diameter, assuming it uses the the same tires as the M3, is 1"+ larger than the 135i tire diameter.
The increase in radius coincidentally (?) matches the difference in height. Of course not all things are equal (suspension different, wheel width has small affect on tire diameter, etc).
Anyway, I will eventually consider lowering the 1M a little if some good prings are offered and there is enough clearance.
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