What is the overall diameter of a 265/75R15 tire?

A 265/75R15 tire is about 30.65″ (779 mm) in overall diameter, with a sidewall height of 198.8 mm and a circumference of 96.29″.

How many revolutions per mile does a 265/75R15 tire turn?

A 265/75R15 turns roughly 658 revolutions per mile (409 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.

What do the numbers in 265/75R15 mean?

265 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 265 × 75% = 198.8 mm tall.

265/75R15

Overall diameter

30.65″

779 mm

Sidewall height

7.82″

198.8 mm

Tread width

265 mm

10.4″

Circumference

96.29″

8.0 ft

Revs per mile

658

409 per km

Wheel diameter

15″

aspect ratio 75%

Compare vs 195/65R15 Compare with a custom size

Cross-section

Overall diameter: 30.65″
Sidewall (each side): 7.82″
Wheel: 15″

265/75R15 compared with other sizes

All 19 practical swaps involving 265/75R15 — diameter change, speedometer impact and a fit verdict for each.

265/75R15 → 245/75R16

245/75R16

Diameter +0.6% · Good fit

265/75R15 → 265/70R16

265/70R16

Diameter +0.1% · Good fit

265/75R15 → 265/70R15

265/70R15

Diameter +3.5% · Marginal fit — proceed with care

265/70R15 → 265/75R15

265/70R15

Diameter −3.4% · Marginal fit — proceed with care

265/70R16 → 265/75R15

265/70R16

Diameter −0.1% · Good fit

265/65R17 → 265/75R15

265/65R17

Diameter −0.3% · Good fit

245/70R17 → 265/75R15

245/70R17

Diameter −0.5% · Good fit

245/75R16 → 265/75R15

245/75R16

Diameter −0.6% · Good fit

255/70R17 → 265/75R15

255/70R17

Diameter +1.3% · Good fit

275/65R17 → 265/75R15

275/65R17

Diameter +1.4% · Good fit

265/70R17 → 265/75R15

265/70R17

Diameter +3.1% · Marginal fit — proceed with care

255/70R16 → 265/75R15

255/70R16

Diameter −1.9% · Good fit

255/65R17 → 265/75R15

255/65R17

Diameter −2.0% · Good fit

265/75R16 → 265/75R15

265/75R16

Diameter +3.3% · Marginal fit — proceed with care

245/75R17 → 265/75R15

245/75R17

Diameter +2.7% · Good fit

245/65R17 → 265/75R15

245/65R17

Diameter −3.6% · Marginal fit — proceed with care

245/70R16 → 265/75R15

245/70R16

Diameter −3.7% · Marginal fit — proceed with care

265/75R15 → 265/65R17

265/65R17

Diameter +0.3% · Good fit

265/75R15 → 195/65R15

195/65R15

Diameter +22.7% · Not recommended

Common questions

What is the overall diameter of a 265/75R15 tire?: A 265/75R15 tire is about 30.65″ (779 mm) in overall diameter, with a sidewall height of 198.8 mm and a circumference of 96.29″.
How many revolutions per mile does a 265/75R15 tire turn?: A 265/75R15 turns roughly 658 revolutions per mile (409 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
What do the numbers in 265/75R15 mean?: 265 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 265 × 75% = 198.8 mm tall.