Quote:
Originally Posted by serendib
Thanks for the very informative post Dave
E92 M3 ZCP
I have a set of 18" Apex PS7's that match the OEM ZCP rim WIDTHs (9" fr, 10" rear staggered rim widths) with RE71R 275/35/18 square. Fronts are rubbing slights on the struts under very heavy cornering loads. Will be adding 5mm spacers and this will definitely provide sufficient clearance. Rears clear without spacers.
I am also running the Pzero OEM sizes on the ZCP 19" wheels and will be changing those out to Pzero 275 fr and 295/30/19 rear.
HOWEVER - There are many versions of the Pzero 295/30/19 on Tire Rack.
295/30ZR19 100Y XL Sect 11.6", Tread 11.5"
R01 Audi
295/30ZR19 100Y XL Sect 11.6", Tread NA (does anyone know the tread width?) i.e. Will these fit without rubbing?
N2 Porsche
295/30ZR19 100Y XL Sect 11.9", Tread 11.7"
(Assume this is the tire you refer to in the above post as viable on ZCP rim)
295/30ZR19 100Y XL Sect 11.9", Tread 12.5"
(Assume that these will rub)
Anyone know how this tire is so much more tread on the ground?
BMW
295/35ZR19 104Y XL Sect NA, Tread 9.9"
Due to the reduction in tread wouldn't want these anyway but assume these are too tall AND also may rub
Any advice is greatly appreciated.
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I was always confused with the difference in tread width between tires of the same size and model but then I saw the following article which basically explains how Tirerack.com measures tires. The difference in tread measurement may have more to do with the shape of the tire than actual width of the tread. Changing the shape of a tire apparently changes how it handles with more round shaped tread making it more progressive at break away. I suspect car manufactures are likely asking for tires that are more round so they are more predictable and better for normal drivers.
http://www.tirerack.com/tires/tirete...jsp?techid=201