i just noticed that on my new coupe. hmmm. that cant be good with a 330 hp rwd sports car i've read lots of members on here change to 245/40/19 f and 275/35/19 r tires, but what brand???

 

The tires are either w or y rated, which is actually faster than a z rating.

 

the speed rating has nothing to do with the hp of the vehicle....

 

i dont think people really care what rating it is as long as it isn't H rated or something cheap

 

Yeah, Z-rating is old school. I believe the sport wheels come with tires rated to something like 186mph. I wouldn't worry about the tires

 

M 81 mph 130 km/h
N 87 mph 140km/h Temporary Spare Tires
P 93 mph 150 km/h
Q 99 mph 160 km/h Studless & Studdable Winter Tires
R 106 mph 170 km/h H.D. Light Truck Tires
S 112 mph 180 km/h Family Sedans & Vans
T 118 mph 190 km/h Family Sedans & Vans
U 124 mph 200 km/h
H 130 mph 210 km/h Sport Sedans & Coupes
V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars
W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars
Z 149mph 240km/h

You're not gonna hit 168 anytime soon.

 

w & Y were just recently added due to the need for higher speed rated tires. Z is outdated.

 

Ha! I'm a noob then . So the Potenzas that came with the Sport model are actually decent? After they wear out, what brands are most popular for g37s? I'd like to go a little wider for the next set (245/40 f and 275/35 r)