4364038471701 31959632445537 4364038504469 31959632478305 4364038537237 31959632543841 18158519484513 31959646699617 18158519517281 31959646765153 18158519550049 31959646863457 53581328149 31942253543521 2264279744533 31942253576289 53581328341 31942253641825 35386850438 31960533237857 2264329846805 31960533270625 35386850502 31960533303393 5386807107 31960571314273 2264409571349 31960571379809 5386807171 31960571478113 15266927494 31960626954337 2264610177045 31960627052641 15266927558 31960627085409 12471587209313 32343771873377 32343779344481 32343813161057 32343849762913 32343861100641 4364126322709 31960675418209 4364126355477 31960675483745 4364126388245 31960675516513 18071724949601 31960742658145 18071724982369 31960742723681 18071725015137 31960742756449
Your Cart

There's nothing here yet!

Suggested Add-Ons:

Understanding Tire Speed Rating Charts

Understanding Tire Speed Rating Charts


The numbers you see on the sidewall of a tire, contain valuable details about the tire. The alphanumeric code holds in itself the complete description of the tires, which helps people decide whether a tire is suitable for their vehicle or not.

A typical code on a Light Truck & SUV tire looks like; 35(Diameter)x12.5(Width)R20(Rim Size) E(Ply Rating) and our tires will have another spot on the tire with Load Index and Speed Rating. A speed rating will be an alphabetic number ranging from L-Z stating how fast the tire is rated for. If you are driving then you should know that the code on the sidewall, contains details of the tire from the speed rating to the manufacture details. Reading and understanding the speed rating chart will let you know the service description of the tire.  The speed rating is usually located next to the load index, which will tell you how much weight the tire can hold. The load index will typically be first and then the speed rating. For instance, our Claw 35x12.5R20 E has a load index of 121 and a speed rating of Q.  To understand the actual meaning of the code, you need to read a tire speed rating chart. 

Understanding the Speed Rating and Reading the Speed Rating Chart

Speed rating on the tire displays the top-speed of the vehicle at which a tire safely functions, beyond this, it is not safe to use the tire, and it may burst. Locating a "Q" on a TreadWright sidewall would indicate the top of 99mph. The speed rating that you will find on the tires may be from the following; L, M, N, P, Q, R, S, T, H, V, W and Z. The tires with a rating from M to W, are designed to perform at top-speeds from 130mph to 186mph. For tires intended for vehicles with a top speed higher than 149mph, are assigned with a Z-speed rating.

Speed Rating Chart

 Understanding the Z-Speed Rating

When the manufacturers designed the Z-speed rating tires, they did not specify the top-speed at which these tires were capable of functioning perfectly, without wear-and-tear. To specify the maximum speed rating for Z-rated tires, the manufacturers began to add W, Y, and (Y) ratings to the code. Therefore, a tire with a Z-speed rating has a code similar to 225/50ZR16 91W. The Z in this code specifies that this tire is perfect for vehicles with a top speed higher than 149mph, and the additional W-rating displays that it is safe to use for a vehicle with a top speed of 168mph. A Y-speed rating on the tire is an indication that it is safe to use the tire for a vehicle with a top speed of 186mph, while (Y)-speed rating specifies that the tire is perfect for a vehicle with a top speed of 186mph.

Related Posts

What Are Off-Road Tires?
The primary purpose of tires is to generate traction between the road and the vehicle for propulsion. Standard highwa...
Read More
Does Aaron Kaufman Find A Job?
Does Aaron Kaufman Find A Job?
Gather ‘Round & Tune-in  Created from recycled materials using an environmentally responsible process, our tires ...
Read More

Leave a comment

Get "Traction" Or Get Left In The Dust

Sign up for our e-News "Traction" to receive the latest information, new product introduction's, and specials.