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Interactive decoder

Tire Size & Speed Rating Decoder

Every tire sidewall carries a code. Type yours to see what each part means, plus diameter and age.

Quick answer

In P225/65R17 102H: P = passenger tire, 225 = width in mm, 65 = sidewall height as % of width, R = radial, 17 = wheel diameter in inches, 102 = load index (1,874 lbs per tire) and H = speed rating (130 mph).

Decode your tire size

Type the code from your sidewall or pick an example.

P225/65R17 102H

  • Overall diameter

    28.5"

    Revs per mile

    707

Speed rating chart

L

75 mph

M

81 mph

N

87 mph

P

93 mph

Q

99 mph

R

106 mph

S

112 mph

T

118 mph

U

124 mph

H

130 mph

V

149 mph

W

168 mph

Y

186 mph

"ZR" in the size means rated above 149 mph. Never fit a lower speed rating than your car's original tires.

How old are your tires?

Find the oval DOT code on the sidewall. The last four digits are the week and year it was made.

Made in week 23 of 2024 — about 2.4 years old.

Plenty of life left, age-wise.

Expert answers

Tire Codes FAQ

5 common questions

In P225/65R17 102H, P is the tire type, 225 is the width in millimeters, 65 is the aspect ratio, R means radial, 17 is the rim diameter in inches, 102 is the load index and H is the speed rating.

It is the maximum sustained speed the tire is rated for: for example S = 112 mph, T = 118 mph, H = 130 mph, V = 149 mph, W = 168 mph and Y = 186 mph.

Find the DOT code on the sidewall.

The last four digits show the week and year of manufacture — 2324 means the 23rd week of 2024.

Many carmakers recommend replacing tires six years after manufacture regardless of tread, and most tire makers say no more than ten years.

Stick to the size on your door-jamb placard.

Alternate sizes should stay within about 3% of the original overall diameter and match or exceed the load index and speed rating.

Before you buy

Was it maintained — or neglected?

Shopping for a used car? A VIN check shows accident, title, odometer and service history — so you know how the last owner treated it.

Enter Your VIN: Find your VIN on the driver-side dashboard, door jamb, or insurance card.

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