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News:
2015.08.25
  Two cars related tables released today: Tire codes - speed ratings and Tire codes - load index
2015.07.30
2015.04.06
  This time 3 new calculators for fractions: Fractions: adding and subtracting, Fractions: 4 operations and Fractions: inverse (reciprocal). Each of them shows all sub-steps needed to compute common denominators, create improper fraction (if needed), reduce the fraction etc.
2015.03.29
  You love it or you hate it. You understand it or don't have a clue. Percents, percentage is a powerful tool to say about part of something. We made the Percentage calculator to make your life easier.

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Tire codes - speed ratings
The table of tire speed rating codes. And also explanation of meaning of tire markings (bit by bit) with simple infographic.
Some facts
We explained below, how to read tire markings. The things you can read from symbol on a tire are:
  • Nominal section width - this is a width of tire in milimeteres.
  • Aspect ratio - this is a relation beetwen tire's high and width in percentages. Less ratio means wider tire. Historically, the most common was the profile 100% (equal width and height), but there are many different ratios popular nowadays like 80, 70, 60, 55 or 50 etc.
  • Tire construction - this parameter says what is internal construction of the tire. Most common symbols are:
    • R - for radial construction. It's the most popular type for cars.
    • D - for diagonal construction. This type of tires is popular for example in agricultural machinery.
    • B - for bias belt construction. This is special hybrid beetwen radial and diagonal construction. We can found this type of tires for example in the motorbikes.
  • Diameter - for example 17'' diameter means that given tire fits a 17" diameter wheel.
  • Load index - this parameter determines the maximum allowed load, which can be handled by single tire safely. It's a two or three digit symbol denoting maximum load in pounds or kilograms. For example load index 97 is related to maximum load of 730 kg (1,610 lb) per single tire. The table showing how to find maximum load in lb/kg (when we know load index) can be found in the calculator: Tire codes - load index.
  • Speed rating - this parameter determines the maximum speed, which can be applied to the tire safely with load given by load index. In most common case it's a single letter symbol. For example single letter Q means, that maximum allowed speed is 100 mph (160km/h). The table showing how to find maximum speed (when we know the tire speed rating) can be found in the calculator: Tire codes - speed ratings.
Example
There is example symbol, which we can found on the car tire below. We can read from it, that:
  • The tire has 225 mm of width.
  • Its aspect ratio (height divided by width) is 55%. So, it's rather "wide" tire.
  • The tire has radial construction.
  • The tire fits a 17" diameter wheel.
  • The load index of this tire is 97. It means, that its maximum load is 1,610 lb (730 kg). The table showing how to convert load index value into load in kilograms or pounds can be found in the calculator: Tire codes - load index.
  • Its speed rating is W, which means that we can drive with maximum speed 168 mph (270 km/h). The table showing how to convert speed rating symbol into speed in mph or km/h can be found in the calculator: Tire codes - speed ratings.

Setup table:
Speed symbol - letter symbol printed on your tire
Approx mph - aproximately the maximum speed at which the tire can carry the load corresponding with its load index in miles per hours
Approx km/h - aproximately the maximum speed at which the tire can carry the load corresponding with its load index in kilometers per seconds
Show all / Clear all


Speed SymbolApprox mphAprox km/h
A135
A2610
A3915
A41220
A51625
A61930
A72235
A82540
B3150
C3760
D4065
E4370
F5080
G5690
J62100
Speed SymbolApprox mphAprox km/h
K68110
L75120
M81130
N87140
P94150
Q100160
R106170
S112180
T118190
H131210
V149240
VR131210
W168270
Y186300
ZR149240