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TireRack.com - About - Tech Center
Speed Rating 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 Hydroplaning Resistance...What Direction Should Your Tires Go? Hydroplaning: The Role Tires Play Load Range/Ply Rating Identification…

Related Searches: Diameter Chart | Rim Width Chart | Tire Width Vs Wheel Width
 
Sumitomo Tires
…) Ultra High Performance Summer HTR Z (632) HTR Z II (1,055) Ultra High Performance All-Season HTR A/S P01 (W-Speed Rated) (174) High Performance All-Season HTR A/S P01 (H- or V-Speed Rated) (276) Standard Touring All-Season HTR T4 (80) Touring LS T (41) Grand Touring All-Season Touring LS H (25) Touring…

Related Searches: Sumitomo Touring Reviews | Sumitomo Htr A S P01 | Z Rated
 
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 Searches: Speed Rating | Speed Rating Letters | H Rating
 
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 Searches: Speed Rating Letters | Speed Rating | Z Rated
 
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 Searches: Tire Speed Ratings Explained | Speed Ratings Explained | Speed Rating
 
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 Searches: Yokohama Avid H4s | Top Rated Summer Tires | H 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 Searches: Zr Speed Rated | Zr Rating | Zr
 
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 Searches: Nail Damage | H Vs V Rated | Slow Air Leak
 
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 Searches: Speed Rating | V Rated | Lower Speed Rating
 
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 Searches: Tire Psi Chart | Z Rated
 
Ultra High Performance Summer Tires
…Tire Kumho Ecsta SPT Ecsta SPT XRP Michelin Pilot Exalto PE2 See Special Offer on this Tire Pirelli Cinturato P7 (W- or Y-Speed Rated) Cinturato P7 Run Flat (W- or Y-Speed Rated) Cinturato P7 with Seal Inside eufori@ Sumitomo HTR Z HTR Z II Toyo Proxes T1 Sport Proxes T1R Yokohama A008 ADVAN A10A ADVAN…

Related Searches: 17 Low Profile Tire | Sumitomo Run Flats | Toyo Proxes
 
Tire Tech Information - 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 Searches: Speed Ratings Explained | Rolling Radius | Sidewall Deflection
 
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