Tire speed rating chart
The letter after the load index is the speed rating: the top speed the tire is built to carry its rated load. An S-rated tire is rated to 112 mph.
| Rating | Max speed | km/h |
|---|---|---|
| F | 50 mph | 80 km/h |
| G | 56 mph | 90 km/h |
| J | 62 mph | 100 km/h |
| K | 68 mph | 110 km/h |
| L | 75 mph | 120 km/h |
| M | 81 mph | 130 km/h |
| N | 87 mph | 140 km/h |
| P | 93 mph | 150 km/h |
| Q | 99 mph | 160 km/h |
| R | 106 mph | 170 km/h |
| S | 112 mph | 180 km/h |
| T | 118 mph | 190 km/h |
| U | 124 mph | 200 km/h |
| H | 130 mph | 210 km/h |
| V | 149 mph | 240 km/h |
| W | 168 mph | 270 km/h |
| Y | 186 mph | 300 km/h |
Note that H sits between U and V. km/h values from UN Regulation No. 30, §2.29.1 (2007-03-29) and UN Regulation No. 54, §2.28.2 (2004-04-16); mph converted at 1 mile = 1.609344 km and rounded.
Reading it on the tire
In 265/70R17 115T, 115 is the load index and T is the speed rating, 118 mph. A speed rating is a lab rating, not a recommended driving speed.
Printed from https://tiresizecalc.net/speed-rating-chart/. Figures as published on 2026-11-01. The sources are listed below.
Sources
- UN Regulation No. 30 - Uniform provisions concerning the approval of pneumatic tyres for motor vehicles and their trailers (Revision 3). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.29/Rev.3. 2007-03-29. Para 2.29.1: speed category symbols L to Y in km/h. Retrieved 2026-11-01.
- UN Regulation No. 54 - Uniform provisions concerning the approval of pneumatic tyres for commercial vehicles and their trailers (Revision 2). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.53/Rev.2. 2004-04-16. Para 2.28.1 and 2.28.2: speed category definition; symbols F to H in km/h. Retrieved 2026-11-01.
- Computed by tiresizecalc.net from the cited formula. Sri Murugan Systems. mph = km/h x 0.621371 (1 mile = 1.609344 km exactly), rounded. Retrieved 2026-11-01.
Last reviewed 2026-11-01. The full source list, with dates and file checksums, is in How the numbers are calculated. To report an error, email contactus@tiresizecalc.net.