tire speed rating

I would ask a tire shop which tires are best for your car. They deal in tires all day long.

well the 1996 cadillac tops out at 130mph factory chipped so there is no point on getting a tire rating up to 180 mph. Tire speed ratings should never be associated with the ability of the vehicle to handle the speed for which the tire is rated

Tire Ratings
Y** - 186 mph
ZR - 183 mph
W** - 168 mph
* - 149 mph
V - 149 mph
H - 130 mph
U- 124 mph
T- 118 mph
S - 112 mph
Q - 99 mph
p - 93 mph
N - 87 mph
M - 81 mph