What is the overall diameter of a 295/65R20 tire?

A 295/65R20 tire is about 35.10″ (891 mm) in overall diameter, with a sidewall height of 191.8 mm and a circumference of 110.26″.

How many revolutions per mile does a 295/65R20 tire turn?

A 295/65R20 turns roughly 575 revolutions per mile (357 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.

What do the numbers in 295/65R20 mean?

295 is the tread width in millimetres, 65 is the aspect ratio — the sidewall height as a percentage of the tread width — and 20 is the wheel diameter in inches. So the sidewall is 295 × 65% = 191.8 mm tall.

295/65R20

Overall diameter

35.10″

891 mm

Sidewall height

7.55″

191.8 mm

Tread width

295 mm

11.6″

Circumference

110.26″

9.2 ft

Revs per mile

575

357 per km

Wheel diameter

20″

aspect ratio 65%

Compare vs 275/55R20 Compare with a custom size

Cross-section

Overall diameter: 35.10″
Sidewall (each side): 7.55″
Wheel: 20″

295/65R20 compared with other sizes

All 14 practical swaps involving 295/65R20 — diameter change, speedometer impact and a fit verdict for each.

295/65R20 → 295/70R18

295/70R18

Diameter +2.4% · Good fit

295/65R20 → 275/65R20

275/65R20

Diameter +3.0% · Marginal fit — proceed with care

295/65R20 → 285/60R20

285/60R20

Diameter +4.9% · Marginal fit — proceed with care

295/65R20 → 285/65R20

285/65R20

Diameter +1.5% · Good fit

295/65R20 → 295/60R20

295/60R20

Diameter +3.4% · Marginal fit — proceed with care

285/65R20 → 295/65R20

285/65R20

Diameter −1.5% · Good fit

295/60R20 → 295/65R20

295/60R20

Diameter −3.3% · Marginal fit — proceed with care

275/65R20 → 295/65R20

275/65R20

Diameter −2.9% · Good fit

285/60R20 → 295/65R20

285/60R20

Diameter −4.7% · Marginal fit — proceed with care

305/55R20 → 295/65R20

305/55R20

Diameter −5.4% · Not recommended

295/70R18 → 295/65R20

295/70R18

Diameter −2.4% · Good fit

285/70R18 → 295/65R20

285/70R18

Diameter −4.0% · Marginal fit — proceed with care

285/50R22 → 295/65R20

285/50R22

Diameter −5.4% · Not recommended

295/65R20 → 275/55R20

275/55R20

Diameter +10.0% · Not recommended

Common questions

What is the overall diameter of a 295/65R20 tire?: A 295/65R20 tire is about 35.10″ (891 mm) in overall diameter, with a sidewall height of 191.8 mm and a circumference of 110.26″.
How many revolutions per mile does a 295/65R20 tire turn?: A 295/65R20 turns roughly 575 revolutions per mile (357 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
What do the numbers in 295/65R20 mean?: 295 is the tread width in millimetres, 65 is the aspect ratio — the sidewall height as a percentage of the tread width — and 20 is the wheel diameter in inches. So the sidewall is 295 × 65% = 191.8 mm tall.