275/45R20
A 275/45R20 tire is 29.74 inches tall and 10.8 inches wide, with a 4.87-inch sidewall, mounted on a 20-inch wheel.
Common fitments: Tahoe, Expedition, Grand Cherokee
Overall diameter
29.74″
756 mm
Sidewall height
4.87″
123.8 mm
Tread width
275 mm
10.8″
Circumference
93.44″
7.8 ft
Revs per mile
678
421 per km
Wheel diameter
20″
aspect ratio 45%
Cross-section
- Overall diameter
- 29.74″
- Sidewall (each side)
- 4.87″
- Wheel
- 20″
275/45R20 in inches and millimeters
Every dimension of a 275/45R20, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 29.74″ | 756 mm |
| Tread width | 10.8″ | 275 mm |
| Sidewall height | 4.87″ | 123.8 mm |
| Wheel diameter | 20″ | 508 mm |
| Circumference | 93.44″ | 2373 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.
275/45R20 compared with other sizes
All 32 practical swaps involving 275/45R20 — diameter change, speedometer impact and a fit verdict for each.
275/45R20 → 265/50R19
265/50R19
Diameter +1.1% · This fits
275/45R20 → 255/45R20
255/45R20
Diameter +2.4% · This fits
245/50R20 → 275/45R20
245/50R20
Diameter −0.3% · This fits
255/50R20 → 275/45R20
255/50R20
Diameter +1.0% · This fits
265/45R20 → 275/45R20
265/45R20
Diameter −1.2% · This fits
265/50R20 → 275/45R20
265/50R20
Diameter +2.3% · This fits
255/45R20 → 275/45R20
255/45R20
Diameter −2.4% · This fits
275/40R20 → 275/45R20
275/40R20
Diameter −3.6% · Borderline. Check clearance first
245/45R20 → 275/45R20
245/45R20
Diameter −3.6% · Borderline. Check clearance first
255/55R20 → 275/45R20
255/55R20
Diameter +4.4% · Borderline. Check clearance first
285/50R20 → 275/45R20
285/50R20
Diameter +5.0% · Borderline. Check clearance first
295/35R20 → 275/45R20
295/35R20
Diameter −5.4% · Too big a jump
245/55R19 → 275/45R20
245/55R19
Diameter −0.5% · This fits
245/60R18 → 275/45R20
245/60R18
Diameter −0.6% · This fits
285/40R21 → 275/45R20
285/40R21
Diameter +0.8% · This fits
235/65R18 → 275/45R20
235/65R18
Diameter +1.0% · This fits
275/45R20 → 235/65R18
235/65R18
Diameter −0.9% · This fits
275/45R20 → 245/55R19
245/55R19
Diameter +0.5% · This fits
275/45R20 → 245/45R20
245/45R20
Diameter +3.7% · Borderline. Check clearance first
275/45R20 → 245/50R20
245/50R20
Diameter +0.3% · This fits
275/45R20 → 255/50R20
255/50R20
Diameter −1.0% · This fits
275/45R20 → 255/55R20
255/55R20
Diameter −4.2% · Borderline. Check clearance first
275/45R20 → 265/45R20
265/45R20
Diameter +1.2% · This fits
275/45R20 → 265/50R20
265/50R20
Diameter −2.3% · This fits
275/45R20 → 275/40R20
275/40R20
Diameter +3.8% · Borderline. Check clearance first
275/45R20 → 285/50R20
285/50R20
Diameter −4.7% · Borderline. Check clearance first
275/45R20 → 265/40R21
265/40R21
Diameter +1.4% · This fits
275/45R20 → 265/45R21
265/45R21
Diameter −2.1% · This fits
275/45R20 → 275/45R21
275/45R21
Diameter −3.3% · Borderline. Check clearance first
275/45R20 → 285/40R21
285/40R21
Diameter −0.8% · This fits
275/45R20 → 275/40R22
275/40R22
Diameter −3.0% · This fits
275/45R20 → 275/55R20
275/55R20
Diameter −6.8% · Too big a jump
Common questions
- What is 275/45R20 in inches?
- A 275/45R20 tire is 29.74 inches tall and 10.8 inches wide, with a 4.87-inch sidewall, mounted on a 20-inch wheel. In metric that is 756 mm tall and 275 mm wide. The circumference is 93.44 inches.
- How tall is a 275/45R20 tire?
- 29.74 inches, or 756 mm. That is the overall diameter, wheel included. It turns about 678 times per mile, which is what your speedometer counts.
- What do the numbers in 275/45R20 mean?
- 275 is the tread width in millimeters, 45 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 × 45% = 123.8 mm tall.