275/40R20
Overall diameter
28.66″
728 mm
Sidewall height
4.33″
110.0 mm
Tread width
275 mm
10.8″
Circumference
90.04″
7.5 ft
Revs per mile
704
437 per km
Wheel diameter
20″
aspect ratio 40%
Cross-section
- Overall diameter
- 28.66″
- Sidewall (each side)
- 4.33″
- Wheel
- 20″
275/40R20 compared with other sizes
All 26 practical swaps involving 275/40R20 — diameter change, speedometer impact and a fit verdict for each.
275/40R20 → 255/45R20
255/45R20
Diameter −1.3% · Good fit
275/40R20 → 275/45R20
275/45R20
Diameter −3.6% · Marginal fit — proceed with care
275/40R20 → 295/35R20
295/35R20
Diameter +1.9% · Good fit
275/40R20 → 245/40R20
245/40R20
Diameter +3.4% · Marginal fit — proceed with care
275/40R20 → 245/45R20
245/45R20
Diameter −0.1% · Good fit
275/40R20 → 245/50R20
245/50R20
Diameter −3.3% · Marginal fit — proceed with care
275/40R20 → 255/50R20
255/50R20
Diameter −4.6% · Marginal fit — proceed with care
275/40R20 → 265/35R20
265/35R20
Diameter +5.0% · Marginal fit — proceed with care
275/40R20 → 265/45R20
265/45R20
Diameter −2.5% · Good fit
275/40R20 → 275/35R20
275/35R20
Diameter +3.9% · Marginal fit — proceed with care
245/45R20 → 275/40R20
245/45R20
Diameter +0.1% · Good fit
255/45R20 → 275/40R20
255/45R20
Diameter +1.3% · Good fit
295/35R20 → 275/40R20
295/35R20
Diameter −1.9% · Good fit
275/35R20 → 275/40R20
275/35R20
Diameter −3.8% · Marginal fit — proceed with care
275/45R20 → 275/40R20
275/45R20
Diameter +3.8% · Marginal fit — proceed with care
265/45R20 → 275/40R20
265/45R20
Diameter +2.5% · Good fit
245/40R20 → 275/40R20
245/40R20
Diameter −3.3% · Marginal fit — proceed with care
245/50R20 → 275/40R20
245/50R20
Diameter +3.4% · Marginal fit — proceed with care
265/35R20 → 275/40R20
265/35R20
Diameter −4.7% · Marginal fit — proceed with care
255/50R20 → 275/40R20
255/50R20
Diameter +4.8% · Marginal fit — proceed with care
255/50R19 → 275/40R20
255/50R19
Diameter +1.3% · Good fit
255/55R18 → 275/40R20
255/55R18
Diameter +1.3% · Good fit
235/50R19 → 275/40R20
235/50R19
Diameter −1.4% · Good fit
235/60R18 → 275/40R20
235/60R18
Diameter +1.5% · Good fit
275/40R20 → 265/40R21
265/40R21
Diameter −2.3% · Good fit
275/40R20 → 275/55R20
275/55R20
Diameter −10.2% · Not recommended
Common questions
- What is the overall diameter of a 275/40R20 tire?
- A 275/40R20 tire is about 28.66″ (728 mm) in overall diameter, with a sidewall height of 110.0 mm and a circumference of 90.04″.
- How many revolutions per mile does a 275/40R20 tire turn?
- A 275/40R20 turns roughly 704 revolutions per mile (437 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 275/40R20 mean?
- 275 is the tread width in millimetres, 40 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 275 × 40% = 110.0 mm tall.