275/40R20
A 275/40R20 tire is 28.66 inches tall and 10.8 inches wide, with a 4.33-inch sidewall, mounted on a 20-inch wheel.
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 in inches and millimeters
Every dimension of a 275/40R20, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 28.66″ | 728 mm |
| Tread width | 10.8″ | 275 mm |
| Sidewall height | 4.33″ | 110.0 mm |
| Wheel diameter | 20″ | 508 mm |
| Circumference | 90.04″ | 2287 mm |
Nominal dimensions from the size code. A real tire varies by a few millimeters between manufacturers, and a loaded tire sits slightly shorter than its free diameter.
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% · This fits
275/40R20 → 275/45R20
275/45R20
Diameter −3.6% · Borderline. Check clearance first
275/40R20 → 295/35R20
295/35R20
Diameter +1.9% · This fits
275/40R20 → 245/40R20
245/40R20
Diameter +3.4% · Borderline. Check clearance first
275/40R20 → 245/45R20
245/45R20
Diameter −0.1% · This fits
275/40R20 → 245/50R20
245/50R20
Diameter −3.3% · Borderline. Check clearance first
275/40R20 → 255/50R20
255/50R20
Diameter −4.6% · Borderline. Check clearance first
275/40R20 → 265/35R20
265/35R20
Diameter +5.0% · Borderline. Check clearance first
275/40R20 → 265/45R20
265/45R20
Diameter −2.5% · This fits
275/40R20 → 275/35R20
275/35R20
Diameter +3.9% · Borderline. Check clearance first
245/45R20 → 275/40R20
245/45R20
Diameter +0.1% · This fits
255/45R20 → 275/40R20
255/45R20
Diameter +1.3% · This fits
295/35R20 → 275/40R20
295/35R20
Diameter −1.9% · This fits
275/35R20 → 275/40R20
275/35R20
Diameter −3.8% · Borderline. Check clearance first
275/45R20 → 275/40R20
275/45R20
Diameter +3.8% · Borderline. Check clearance first
265/45R20 → 275/40R20
265/45R20
Diameter +2.5% · This fits
245/40R20 → 275/40R20
245/40R20
Diameter −3.3% · Borderline. Check clearance first
245/50R20 → 275/40R20
245/50R20
Diameter +3.4% · Borderline. Check clearance first
265/35R20 → 275/40R20
265/35R20
Diameter −4.7% · Borderline. Check clearance first
255/50R20 → 275/40R20
255/50R20
Diameter +4.8% · Borderline. Check clearance first
255/50R19 → 275/40R20
255/50R19
Diameter +1.3% · This fits
255/55R18 → 275/40R20
255/55R18
Diameter +1.3% · This fits
235/50R19 → 275/40R20
235/50R19
Diameter −1.4% · This fits
235/60R18 → 275/40R20
235/60R18
Diameter +1.5% · This fits
275/40R20 → 265/40R21
265/40R21
Diameter −2.3% · This fits
275/40R20 → 275/55R20
275/55R20
Diameter −10.2% · Too big a jump
Common questions
- What is 275/40R20 in inches?
- A 275/40R20 tire is 28.66 inches tall and 10.8 inches wide, with a 4.33-inch sidewall, mounted on a 20-inch wheel. In metric that is 728 mm tall and 275 mm wide. The circumference is 90.04 inches.
- How tall is a 275/40R20 tire?
- 28.66 inches, or 728 mm. That is the overall diameter, wheel included. It turns about 704 times per mile, which is what your speedometer counts.
- What do the numbers in 275/40R20 mean?
- 275 is the tread width in millimeters, 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.