Tire Size Calculator
This calculator will calculate tire diameter (height) from the standard information
given on the sidewall: width, aspect ratio, and wheel size. Keep the tire diameter under 26.5" for all front and 26.7" for all rear tires. Extra wide tires may have to be slightly smaller.
Tire width (mm):
145
155
165
175
185
195
205
215
225
235
245
255
265
275
285
295
305
315
325
335
345
355
365
375
385
395
400
Aspect ratio:
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
Wheel size (inches):
11
12
13
14
15
16
17
18
19
20
21
22
Tire diameter (inches) =
Tire section width (inches) =
Tire sidewall (inches) =