285/50R20
A 285/50R20 tire is 31.22 inches tall and 11.2 inches wide, with a 5.61-inch sidewall, mounted on a 20-inch wheel.
Overall diameter
31.22″
793 mm
Sidewall height
5.61″
142.5 mm
Tread width
285 mm
11.2″
Circumference
98.08″
8.2 ft
Revs per mile
646
401 per km
Wheel diameter
20″
aspect ratio 50%
Cross-section
- Overall diameter
- 31.22″
- Sidewall (each side)
- 5.61″
- Wheel
- 20″
285/50R20 in inches and millimeters
Every dimension of a 285/50R20, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 31.22″ | 793 mm |
| Tread width | 11.2″ | 285 mm |
| Sidewall height | 5.61″ | 142.5 mm |
| Wheel diameter | 20″ | 508 mm |
| Circumference | 98.08″ | 2491 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.
285/50R20 compared with other sizes
All 34 practical swaps involving 285/50R20 — diameter change, speedometer impact and a fit verdict for each.
285/50R20 → 275/45R20
275/45R20
Diameter +5.0% · Borderline. Check clearance first
285/50R20 → 275/55R20
275/55R20
Diameter −2.2% · This fits
285/50R20 → 285/60R18
285/60R18
Diameter −0.8% · This fits
285/50R20 → 255/60R19
255/60R19
Diameter +0.6% · This fits
285/50R20 → 275/55R19
275/55R19
Diameter +1.0% · This fits
285/50R20 → 245/50R20
245/50R20
Diameter +5.3% · Too big a jump
285/50R20 → 255/50R20
255/50R20
Diameter +3.9% · Borderline. Check clearance first
285/50R20 → 255/55R20
255/55R20
Diameter +0.6% · This fits
285/50R20 → 265/50R20
265/50R20
Diameter +2.6% · This fits
285/50R20 → 265/55R20
265/55R20
Diameter −0.8% · This fits
285/50R20 → 265/60R20
265/60R20
Diameter −4.0% · Borderline. Check clearance first
285/50R20 → 275/60R20
275/60R20
Diameter −5.4% · Too big a jump
255/55R20 → 285/50R20
255/55R20
Diameter −0.6% · This fits
265/55R20 → 285/50R20
265/55R20
Diameter +0.8% · This fits
275/55R20 → 285/50R20
275/55R20
Diameter +2.2% · This fits
285/55R20 → 285/50R20
285/55R20
Diameter +3.6% · Borderline. Check clearance first
265/50R20 → 285/50R20
265/50R20
Diameter −2.5% · This fits
305/50R20 → 285/50R20
305/50R20
Diameter +2.5% · This fits
255/50R20 → 285/50R20
255/50R20
Diameter −3.8% · Borderline. Check clearance first
285/45R21 → 285/50R20
285/45R21
Diameter −0.4% · This fits
265/60R20 → 285/50R20
265/60R20
Diameter +4.2% · Borderline. Check clearance first
285/60R18 → 285/50R20
285/60R18
Diameter +0.8% · This fits
285/40R22 → 285/50R20
285/40R22
Diameter −0.8% · This fits
275/45R20 → 285/50R20
275/45R20
Diameter −4.7% · Borderline. Check clearance first
245/50R20 → 285/50R20
245/50R20
Diameter −5.0% · Too big a jump
255/65R18 → 285/50R20
255/65R18
Diameter −0.5% · This fits
285/50R20 → 285/55R20
285/55R20
Diameter −3.5% · Borderline. Check clearance first
285/50R20 → 305/50R20
305/50R20
Diameter −2.5% · This fits
285/50R20 → 275/45R21
275/45R21
Diameter +1.5% · This fits
285/50R20 → 275/50R21
275/50R21
Diameter −1.9% · This fits
285/50R20 → 285/45R21
285/45R21
Diameter +0.4% · This fits
285/50R20 → 275/40R22
275/40R22
Diameter +1.8% · This fits
285/50R20 → 285/40R22
285/40R22
Diameter +0.8% · This fits
285/50R20 → 285/45R22
285/45R22
Diameter −2.7% · This fits
Common questions
- What is 285/50R20 in inches?
- A 285/50R20 tire is 31.22 inches tall and 11.2 inches wide, with a 5.61-inch sidewall, mounted on a 20-inch wheel. In metric that is 793 mm tall and 285 mm wide. The circumference is 98.08 inches.
- How tall is a 285/50R20 tire?
- 31.22 inches, or 793 mm. That is the overall diameter, wheel included. It turns about 646 times per mile, which is what your speedometer counts.
- What do the numbers in 285/50R20 mean?
- 285 is the tread width in millimeters, 50 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 285 × 50% = 142.5 mm tall.