Originally Posted by devo
CUPs are street tires, as are Corsas, which also come standard on GT3s/RSs, too include the RS2. It's not like the GT-R comes with regular street tires either. There isn't much difference between what comes OEM on the RS or which comes OEM on a GT-R when it comes to grip.
You have no clue then what a CUP tire is... They are nothing like the GTR or other 'Normal' high performance street tire, offered on BMW's and other performance machines.
A CUP tire is a 6/32nd, 80 Treadware DOT legal race tire.
The GTR, and other standard performance street tires on these other cars are 10/32 200 Treadwear rated tires... and in the GTR's case... even a Runflat!