The codes on tires at the faster end of the scale can appear with some variations. Michelin and General Tire place a Z in front of the R in the size code for tires with speed ratings of W or Y ...

Your Guide to Tire Speed Rating. When it comes to selecting new tires for your car, truck, or SUV, the tires' speed rating is just one of many factors you should consider.

Question: I am buying a set of performance tires for my Chevrolet Camaro, and I have been told some different things at tire stores about speed ratings on tires. Some explanation of what they mean ...

Some tires have speed ratings of W, 168 mph and Y, 186 mph. While such speeds may seem wildly impractical, tires with higher speed ratings tend to provide better handling at legal speed limits.

Toyo says its tires may be repaired and returned to service, but any tire rated W (more than 168 m.p.h.), V, Z or VR (a V-rated radial) should be considered to have an H rating.

The ratings run from M for 130 km/h to Y for 300 km/h. In North America, where the maximum legal limit is 75 mph or 122 km/h in some U.S. states, virtually every passenger car tire sold exceeds ...

Last fall, we joined Continental Tires at the Nardo proving ground in Italy, where eighteen tuner cars were invited to show off their top speeds on the 7.8-mile circular track. Read the full story ...

Some tires have speed ratings of W, 168 mph and Y, 186 mph. While such speeds may seem wildly impractical, tires with higher speed ratings tend to provide better handling at legal speed limits.

The next specification we'll look at is the speed rating of a tire. This speed is calculated in a laboratory to determine the highest speed a tire can safely and repeatedly travel while under load.

Common ratings for passenger cars are T, H, and V, and faster tires earn ratings of W, Y, or Z (there is no "X" tire speed rating). You might find speed ratings of L through R on some temporary ...