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A tire’s certified speed rating is given a letter from A to Z, ranging from 5km/h (3mph) to above 300 km/h (186 mph). This rating system (see below) shows the top speed for which a tire is certified. It does not indicate the total performance capability of a tire.
A tire’s speed rating, also call its speed index, tells you the maximum speed a tire can safely maintain over time while carrying its maximum load (which is specified in the tire load index). It is marked using a letter from A to Z, which you can then use to look up the maximum speed in miles per hour or kilometers per hour.
W. A W means the tire is approved for speeds up to 168 mph (270 km/h) under optimal conditions. W speed rated tires land firmly at the performance end of the speed rating spectrum. Ws are suitable for performance coupes and sedans, and even street driven exotic sports cars.
Wondering what your tire speed rating is? From W speed rating to V speed rating, we’ve got you covered. Use our chart to learn what speed rating means for your tire.
Tire Conversion Charts. Size Conversion Tables: Use these tables to convert your older style inch size to the new metric sizing. The load index/speed symbol indicates the speed at which the tire can carry a load corresponding to its load index under conditions specified by the tire manufacturer.
24 Σεπ 2020 · A tire speed rating testing device is used by tire makers to determine a tire's heat and speed tolerance. Testing Speed rating on tires is performed by using a scale based on kilometers per hour (km/h) to ensure compliance with ECE (Economic Commission for Europe) standards.
speed rating chart. Speed rating Code mph km/h Code mph km/h 120 130 140 150 160 170 180 190 200 210 Al A2 AS A7 B c D E G J K 3 6 9 12 16 19 22 25 31 37 40 43 50 56 62 68 20 25 30 35 40 50 60 65 70 80 90 100 110 L M N P Q R s U 11 z W Y (Y) 75 81 87 94 100 106 112 118 124 130 149 over 149 over 240 168 270 over 168 over 270 186 over 186 over ...
