TireSizeCheck

235/75R15

Overall diameter

28.88″

733 mm

Sidewall height

6.94″

176.3 mm

Tread width

235 mm

9.3″

Circumference

90.72″

7.6 ft

Revs per mile

698

434 per km

Wheel diameter

15″

aspect ratio 75%

Cross-section

Overall diameter
28.88″
Sidewall (each side)
6.94″
Wheel
15″

235/75R15 compared with other sizes

All 20 practical swaps involving 235/75R15 — diameter change, speedometer impact and a fit verdict for each.

Common questions

What is the overall diameter of a 235/75R15 tire?
A 235/75R15 tire is about 28.88″ (733 mm) in overall diameter, with a sidewall height of 176.3 mm and a circumference of 90.72″.
How many revolutions per mile does a 235/75R15 tire turn?
A 235/75R15 turns roughly 698 revolutions per mile (434 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
What do the numbers in 235/75R15 mean?
235 is the tread width in millimetres, 75 is the aspect ratio — the sidewall height as a percentage of the tread width — and 15 is the wheel diameter in inches. So the sidewall is 235 × 75% = 176.3 mm tall.