275/50R21
A 275/50R21 tire is 31.83 inches tall and 10.8 inches wide, with a 5.41-inch sidewall, mounted on a 21-inch wheel.
Overall diameter
31.83″
808 mm
Sidewall height
5.41″
137.5 mm
Tread width
275 mm
10.8″
Circumference
99.99″
8.3 ft
Revs per mile
634
394 per km
Wheel diameter
21″
aspect ratio 50%
Cross-section
- Overall diameter
- 31.83″
- Sidewall (each side)
- 5.41″
- Wheel
- 21″
275/50R21 in inches and millimeters
Every dimension of a 275/50R21, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 31.83″ | 808 mm |
| Tread width | 10.8″ | 275 mm |
| Sidewall height | 5.41″ | 137.5 mm |
| Wheel diameter | 21″ | 533 mm |
| Circumference | 99.99″ | 2540 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.
275/50R21 compared with other sizes
All 26 practical swaps involving 275/50R21 — diameter change, speedometer impact and a fit verdict for each.
275/50R21 → 275/55R20
275/55R20
Diameter −0.3% · This fits
275/50R21 → 265/55R20
265/55R20
Diameter +1.1% · This fits
275/50R21 → 305/50R20
305/50R20
Diameter −0.6% · This fits
275/50R21 → 265/45R21
265/45R21
Diameter +4.7% · Borderline. Check clearance first
275/50R21 → 275/45R21
275/45R21
Diameter +3.5% · Borderline. Check clearance first
275/45R21 → 275/50R21
275/45R21
Diameter −3.4% · Borderline. Check clearance first
285/45R21 → 275/50R21
285/45R21
Diameter −2.3% · This fits
275/55R20 → 275/50R21
275/55R20
Diameter +0.3% · This fits
265/45R21 → 275/50R21
265/45R21
Diameter −4.5% · Borderline. Check clearance first
305/50R20 → 275/50R21
305/50R20
Diameter +0.6% · This fits
285/45R22 → 275/50R21
285/45R22
Diameter +0.9% · This fits
265/55R20 → 275/50R21
265/55R20
Diameter −1.1% · This fits
285/55R20 → 275/50R21
285/55R20
Diameter +1.6% · This fits
275/55R19 → 275/50R21
275/55R19
Diameter −2.9% · This fits
275/50R22 → 275/50R21
275/50R22
Diameter +3.1% · Borderline. Check clearance first
285/50R20 → 275/50R21
285/50R20
Diameter −1.9% · This fits
265/60R20 → 275/50R21
265/60R20
Diameter +2.2% · This fits
275/60R20 → 275/50R21
275/60R20
Diameter +3.7% · Borderline. Check clearance first
275/40R22 → 275/50R21
275/40R22
Diameter −3.7% · Borderline. Check clearance first
275/50R21 → 285/45R21
285/45R21
Diameter +2.3% · This fits
275/50R21 → 275/40R22
275/40R22
Diameter +3.8% · Borderline. Check clearance first
275/50R21 → 275/50R22
275/50R22
Diameter −3.0% · Borderline. Check clearance first
275/50R21 → 285/40R22
285/40R22
Diameter +2.7% · This fits
275/50R21 → 285/45R22
285/45R22
Diameter −0.8% · This fits
275/50R21 → 285/50R22
285/50R22
Diameter −4.2% · Borderline. Check clearance first
275/50R21 → 305/45R22
305/45R22
Diameter −3.0% · This fits
Common questions
- What is 275/50R21 in inches?
- A 275/50R21 tire is 31.83 inches tall and 10.8 inches wide, with a 5.41-inch sidewall, mounted on a 21-inch wheel. In metric that is 808 mm tall and 275 mm wide. The circumference is 99.99 inches.
- How tall is a 275/50R21 tire?
- 31.83 inches, or 808 mm. That is the overall diameter, wheel included. It turns about 634 times per mile, which is what your speedometer counts.
- What do the numbers in 275/50R21 mean?
- 275 is the tread width in millimeters, 50 is the aspect ratio — the sidewall height as a percentage of the tread width — and 21 is the wheel diameter in inches. So the sidewall is 275 × 50% = 137.5 mm tall.