Published by Rims & Tires
Compiled & checked by the site's publisher from manufacturer, NHTSA & USTMA data · Updated 2026-08-12
The speed rating is a letter that tells you the maximum sustained speed a tire is built to handle safely. You will find it right in the size string. In 225/55R17 97H, the H is the speed rating. Here is what each letter means and why it matters beyond bragging rights.
What does each tire speed rating letter mean?
S (112 mph / 180 km/h): common on light trucks, SUVs, and some sedans.
T (118 mph / 190 km/h): standard all-season tires for passenger cars.
H (130 mph / 210 km/h): the most common rating on sports sedans, coupes, and sportier passenger cars.
V (149 mph / 240 km/h): entry-level performance cars and sporty sedans.
W (168 mph / 270 km/h): performance cars.
Y (186 mph / 300 km/h): high-performance and ultra-performance vehicles.
ZR: a designation for tires built for speeds above 149 mph, with the exact limit set by a paired W or Y.
Why does speed rating matter if you never drive that fast?
Because the rating is really about heat, not speed. A speed rating reflects how well a tire sheds heat at sustained speed, and higher-rated tires use compounds and construction that get rid of that heat more effectively.
At interstate speeds in Georgia summer heat, a tire approaching its speed rating limits will build heat faster than one well below its limit. A T-rated tire on a performance car that is pushed hard will degrade faster and is more prone to failure than an H or V-rated tire.
The rating tracks with handling, too. Higher-rated tires generally have sharper response, more grip, and better lateral stability.
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What happens if you use the wrong speed rating?
Going lower: putting a T-rated tire on a car that calls for H is technically unsafe at the vehicle's designed limits, and it shows up a lot on budget tires. At Georgia highway speeds the day-to-day risk is low, but it is not what the engineers signed off on.
Going higher: no problem at all. A V-rated tire on a car that only asks for H just means you have more headroom than you are using.
Mixing ratings on the same axle: not recommended. Tires with different ratings behave differently at speed, which can create handling imbalances.
Where do you find your vehicle's required speed rating?
On the door-jamb sticker, alongside the tire size and pressure, and again in the owner's manual. The U.S. Tire Manufacturers Association's replacement rule covers it too: replacement tires should carry the same size, load index, and speed rating designation the vehicle or tire manufacturer recommends.
Match or exceed the specified rating. Do not go below it.
Frequently asked
Does speed rating affect ride quality?
Yes, indirectly. Higher-rated tires use harder compounds that handle heat better but tend to ride slightly firmer. Lower-rated tires with softer compounds often ride more comfortably but wear faster under demanding use.
Do I need a high speed rating for driving in Georgia?
The speed limit on most Georgia interstates is 70 mph — well within what a T or H rated tire handles. For normal driving, any tire at or above the vehicle's specification is adequate. If you drive a performance car or push your vehicle hard, sticking to the H, V, or higher ratings your car specifies is the right call.
What does ZR mean on a tire?
ZR is an older designation indicating a tire designed for speeds above 149 mph. Modern high-performance tires use ZR in combination with W or Y to specify the exact limit (e.g., 285/30ZR20 99W means the ZR construction with a W-rated 168 mph limit). You will also see the Z written parenthetically, as in 225/45(Z)R18 — same designation, and it still means the tire sits above V. If your vehicle specifies a ZR tire, a plain V-rated replacement is a step down, not an equivalent.
What is the difference between speed rating and load index?
They sit next to each other in the size string and measure different things. In 225/55R17 97H, the 97 is the load index (how much weight one tire can carry) and the H is the speed rating (the sustained speed the tire is built for). A tire can be strong enough for your truck and still be rated for a lower speed than your car needs, so match both, not just one.
Do winter tires have lower speed ratings?
Often, yes. Dedicated winter tires use softer compounds that stay pliable in the cold, and that same softness generates more heat at sustained speed, so many carry Q, R, or T ratings rather than the H or V a performance sedan came with. It is a real tradeoff rather than a defect — check the rating on the winter set and keep your highway speeds inside it.
Does a higher speed-rated tire last longer?
Not necessarily. Higher speed ratings often ride on softer compounds, which grip better but wear faster. Longevity tracks the treadwear rating far more than the speed rating. A T-rated touring tire can outlast a V-rated performance tire by 30,000 miles or more.
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Last updated 2026-08-12. General guidance only — confirm specifics with a local shop for your exact vehicle.