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Related Categories: Speed Rating Letters | Z Rated Tires | Speed Rating Chart | Sumitomo Touring Reviews | Speed Rating | What Does Z Mean On The Tires | Lower Speed Rating | H Speed Rating | Zr Speed Rated | Best Z Rated Tires

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What's in a letter?


T, Z, W...These letters appear on a tire, but what do they mean? Speed ratings can be a little confusing. I get many calls like this one: "I have an 08 BMW 328i and I need a Z-rated tire." To be honest, Z-rated used to mean a lot more than it does now. When speed ratings first came out, Z was thought…

Related Products: Speed Rating Chart | What Does Z Mean On The Tires | T Speed Rating
 

Speed Rating. Why is it Important?


Speed ratings are as follows: S: 112 mph T: 118 mph U: 124 mph H: 130 mph V: 149 mph Z: Was the highest rating in the 1980s at 150 + mph With the advent of new sports cars that well exceeded the 150 mph barrier, the tire industry adopted a few new speed ratings: W: 168 mph Y: 186 mph Every tire that…

Related Products: Lower Speed Rating | H Speed Rating | V Speed Rating
 

Understanding Speed Ratings


…means? For example, the "Z" in 245/45ZR17 or the "H" in 205/55R16 89H. This letter is the speed rating of the tire. Tires are tested in laboratory conditions under load by tire manufacturers to determine the maximum speed capability of the tire. Shown below is what the speed rating letter equates to in MPH…

Related Products: Q Speed Rating | Speed Rating | H Speed Rating
 

Winter Tech - Air Pressure/Load Adjustment for High Speed Driving


…order to surpass high speed driving stresses. In order to accomplish this, the tire inflation pressure recommendations and the tire's rated load capacities are customized when speeds exceed 160 km/h (99 mph) for all tires up to and including a V-speed rating, and when speeds exceed 190 km/h (118 mph…

Related Products: Tire Psi Chart | Best Z Rated Tires | Revolutions Per Mile
 

Tire Test Results : BFGoodrich Brings Sport to the High Performance All-Season Tire Category


…high grip levels. And while a tire's speed rating isn't a true performance rating, overall tire performance levels tend to climb or fall with higher or lower speed ratings. High Performance All-Season tires, on the other hand, are H- (or sometimes V-) speed rated, deliver a blend of reasonable road manners…

Related Products: Yokohama Avid H4s Reviews | Comparison Chart | H V T Rating
 

Z-speed rated tires. Where have they gone? No worries; they're still here.


…and they're not Z-speed rated? What's the deal here? Back in the day, high performance tires were all Z-speed rated. They were tested at some speed above 149 mph. In order to be more precise, tire manufacturers started testing at 168 mph (W-speed rating) and 186 mph (Y-speed rating). In the above picture…

Related Products: Z Rated Tires | Zr Speed Rated | Zr Rating
 

Sumitomo Tires


…Performance All-Season HTR A/S P01 (W-Speed Rated) (185) High Performance All-Season HTR A/S P01 (H- or V-Speed Rated) (284) Standard Touring All-Season HTR Enhance L/X (T-Speed Rated) (0) Touring LS T (50) Grand Touring All-Season HTR Enhance L/X (H-, V-, or W-Speed Rated) (3) Touring LS H (29) Touring LS…

Related Products: Sumitomo Touring Reviews | Sumitomo Reviews | Z Rated Tires
 

TireRack.com - About - Tech Center


…Return Flat Tire Repairs Effect on Speed Rating Flat-Spotted Tires (Due to Brake Lockup/Slide) Flat-Spotted Tires (Due to Parking/Storage) Government Tire Approval Marks How Do I Compare Price vs. Value? How to Install Your Tire & Wheel Package How to Read Speed Rating, Load Index & Service Descriptions…

Related Products: Diameter Chart | Plus Size Calculator | Equivalent Tire Sizes
 

Tire Tech Information - How to Read Speed Rating, Load Index & Service Descriptions


…ability to manufacturer tires capable of high speeds, none of them recommend the use of their products in excess of legal speed limits. The maximum operating speed of a vehicle must be limited to the lowest speed rated tire on the vehicle. Speed ratings are based on laboratory tests where the tire is…

Related Products: Speed Rating | Speed Rating Chart | Speed Ratings Explained
 

Tire Tech - Air Pressure/Load Adjustment for High Speed Driving Z-Speed


…Adjustment for High Speed Driving Recommended High Speed Pressure & Load Capacity Adjustments For Z-Speed Rated Tires (tire manufacturer must confirm speed capability beyond 149 mph) Vehicle Top Speed Required Tire Pressure Increase Tire Load Capacity % of Branded Maximum Z-Speed Rated Tire 35 psi O.E.…

Related Products: Tire Psi Chart | Z Rated
 

Tire Tech Information - Flat Tire Repairs Effect on Speed Rating


…specified multi-step procedure. Several other manufacturers specify their highest speed-rated tires (originally V-, Z-, W- or Y-speed rated) can be driven no faster than the 130 mph speeds permitted of a lower H-speed rating. However, most tire manufacturers reason that since they have no control over the…

Related Products: Slow Air Leak | Speed Ratings Explained | Slow Leak
 

Ultra High Performance Summer Tires


…Eagle F1 GS EMT Kumho Ecsta SPT Ecsta SPT XRP Michelin Pilot Exalto PE2 Pirelli Cinturato P7 (W- or Y-Speed Rated) Cinturato P7 with Seal Inside eufori@ Cinturato P7 Run Flat (W- or Y-Speed Rated) Sumitomo HTR Z HTR Z II Toyo Proxes T1R Proxes T1 Sport Yokohama ADVAN A10F ADVAN A10A S.drive A008 ADVAN…

Related Products: 215 60 15 Ultra High Performance | Z Rated Tires | Potenza Re 01
 
Related Categories: Speed Rating Letters | Z Rated Tires | Speed Rating Chart | Sumitomo Touring Reviews | Speed Rating | What Does Z Mean On The Tires | Lower Speed Rating | H Speed Rating | Zr Speed Rated | Best Z Rated Tires
 
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