305/45R20 tire size
A 305/45R20 tire is 30.81 in (782.5 mm) tall and 12.01 in (305.0 mm) wide, and turns 655 revolutions per mile.
- 30.81 inOverall diameter
- 5.40 inSidewall height
- 655Revolutions per mile
- 30.8x12.0R20Flotation equivalent
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter | 30.81 in | 782.5 mm |
| Section width | 12.01 in | 305.0 mm |
| Sidewall height | 5.40 in | 137.3 mm |
| Rim diameter | 20.00 in | 508.0 mm |
| Circumference | 96.78 in | 2,458 mm |
| Revolutions per mile | 655 | |
| Flotation equivalent | 30.8x12.0R20 (approx.) | |
305/45R20 is a 20-inch tire with a 305 mm (12.01 in) section width and a 45% aspect ratio, giving a 5.40-inch sidewall and a flotation-style size of about 30.8x12.0R20.
Its overall diameter is 30.81 inches, so it rolls 96.8 inches per revolution and turns about 655 times per mile.
65 other sizes in this list are within 3% of that diameter.
Compare 305/45R20 with plausible swaps
- 265/60R18 vs 305/45R20 (−0.93%)
- 245/65R18 vs 305/45R20 (−0.87%)
- 275/60R18 vs 305/45R20 (+0.60%)
- 255/65R18 vs 305/45R20 (+0.79%)
- 265/55R19 vs 305/45R20 (−1.07%)
- 275/55R19 vs 305/45R20 (+0.33%)
- 235/65R19 vs 305/45R20 (+0.72%)
- 255/60R19 vs 305/45R20 (+0.78%)
- 305/40R20 vs 305/45R20 (−3.90%)
- 285/45R20 vs 305/45R20 (−2.30%)
- 295/45R20 vs 305/45R20 (−1.15%)
- 245/55R20 vs 305/45R20 (−0.64%)
- 305/45R20 vs 275/50R20 (+0.06%)
- 305/45R20 vs 255/55R20 (+0.77%)
- 305/45R20 vs 305/50R20 (+3.90%)
- 305/45R20 vs 275/45R21 (−0.20%)
- 305/45R20 vs 255/50R21 (+0.75%)
- 305/45R20 vs 285/45R21 (+0.95%)
- 305/45R20 vs 275/40R22 (−0.47%)
- 305/45R20 vs 285/40R22 (+0.55%)
- 305/45R20 vs 295/40R22 (+1.57%)
Sizes within 3% of 30.81 in diameter
- 275/50R20 30.83 in (+0.06%)
- 275/45R21 30.74 in (−0.20%)
- 235/75R17 30.88 in (+0.23%)
- 285/30R24 30.73 in (−0.24%)
- 275/55R19 30.91 in (+0.33%)
- 275/40R22 30.66 in (−0.47%)
- 265/75R15 30.65 in (−0.51%)
- 285/40R22 30.98 in (+0.55%)
- 275/60R18 30.99 in (+0.60%)
- 31x10.50R15 31.00 in (+0.63%)
- 31x10.50R16 31.00 in (+0.63%)
- 245/55R20 30.61 in (−0.64%)
- 265/70R16 30.61 in (−0.65%)
- 235/65R19 31.03 in (+0.72%)
- 255/50R21 31.04 in (+0.75%)
- 255/55R20 31.04 in (+0.77%)
- 255/60R19 31.05 in (+0.78%)
- 265/65R17 30.56 in (−0.79%)
- 255/65R18 31.05 in (+0.79%)
- 255/70R17 31.06 in (+0.81%)
- 275/65R17 31.07 in (+0.87%)
- 245/65R18 30.54 in (−0.87%)
- 265/60R18 30.52 in (−0.93%)
- 285/45R21 31.10 in (+0.95%)
- 245/70R17 30.50 in (−0.98%)
- 265/55R19 30.48 in (−1.07%)
- 245/75R16 30.47 in (−1.10%)
- 295/45R20 30.45 in (−1.15%)
- 265/50R20 30.43 in (−1.21%)
- 305/30R24 31.20 in (+1.29%)
- 305/35R22 30.41 in (−1.30%)
- 285/50R20 31.22 in (+1.34%)
- 215/85R16 30.39 in (−1.35%)
- 265/45R21 30.39 in (−1.35%)
- 265/40R22 30.35 in (−1.50%)
- 295/40R22 31.29 in (+1.57%)
- 295/40R21 30.29 in (−1.67%)
- 225/75R17 30.29 in (−1.69%)
- 265/45R22 31.39 in (+1.89%)
- 265/50R21 31.43 in (+2.03%)
- 235/55R20 30.18 in (−2.04%)
- 285/60R18 31.46 in (+2.13%)
- 245/75R17 31.47 in (+2.15%)
- 265/55R20 31.48 in (+2.17%)
- 235/60R19 30.10 in (−2.29%)
- 285/45R20 30.10 in (−2.30%)
- 255/70R16 30.06 in (−2.44%)
- 255/65R17 30.05 in (−2.45%)
- 265/65R18 31.56 in (+2.45%)
- 255/60R18 30.05 in (−2.47%)
- 255/55R19 30.04 in (−2.48%)
- 255/50R20 30.04 in (−2.49%)
- 255/45R21 30.04 in (−2.50%)
- 255/40R22 30.03 in (−2.52%)
- 285/65R17 31.59 in (+2.53%)
- 235/65R18 30.03 in (−2.53%)
- 265/70R17 31.61 in (+2.59%)
- 305/40R22 31.61 in (+2.59%)
- 30x9.50R15 30.00 in (−2.62%)
- 275/60R17 29.99 in (−2.65%)
- 285/40R21 29.98 in (−2.70%)
- 265/75R16 31.65 in (+2.73%)
- 235/70R17 29.95 in (−2.77%)
- 275/55R18 29.91 in (−2.91%)
- 235/85R16 31.73 in (+2.99%)
Open 305/45R20 in the tire size calculator
Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.