245/45R21 tire size
A 245/45R21 tire is 29.68 in (753.9 mm) tall and 9.65 in (245.0 mm) wide, and turns 679 revolutions per mile.
- 29.68 inOverall diameter
- 4.34 inSidewall height
- 679Revolutions per mile
- 29.7x9.6R21Flotation equivalent
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter | 29.68 in | 753.9 mm |
| Section width | 9.65 in | 245.0 mm |
| Sidewall height | 4.34 in | 110.3 mm |
| Rim diameter | 21.00 in | 533.4 mm |
| Circumference | 93.25 in | 2,368 mm |
| Revolutions per mile | 679 | |
| Flotation equivalent | 29.7x9.6R21 (approx.) | |
245/45R21 is a 21-inch tire with a 245 mm (9.65 in) section width and a 45% aspect ratio, giving a 4.34-inch sidewall and a flotation-style size of about 29.7x9.6R21.
Its overall diameter is 29.68 inches, so it rolls 93.2 inches per revolution and turns about 679 times per mile.
72 other sizes in this list are within 3% of that diameter.
Compare 245/45R21 with plausible swaps
- 265/50R19 vs 245/45R21 (−0.84%)
- 245/55R19 vs 245/45R21 (−0.24%)
- 275/50R19 vs 245/45R21 (+0.49%)
- 265/45R20 vs 245/45R21 (−0.98%)
- 305/40R20 vs 245/45R21 (−0.25%)
- 245/50R20 vs 245/45R21 (−0.12%)
- 275/45R20 vs 245/45R21 (+0.21%)
- 245/40R21 vs 245/45R21 (−3.25%)
- 235/45R21 vs 245/45R21 (−1.19%)
- 265/40R21 vs 245/45R21 (−1.13%)
- 275/40R21 vs 245/45R21 (−0.07%)
- 245/45R21 vs 315/35R21 (0.00%)
- 245/45R21 vs 285/40R21 (+0.99%)
- 245/45R21 vs 255/45R21 (+1.19%)
- 245/45R21 vs 265/45R21 (+2.39%)
- 245/45R21 vs 315/30R22 (−0.81%)
- 245/45R21 vs 285/35R22 (+0.58%)
- 245/45R21 vs 255/40R22 (+1.18%)
Sizes within 3% of 29.68 in diameter
- 315/35R21 29.68 in (0.00%)
- 275/40R21 29.66 in (−0.07%)
- 245/50R20 29.65 in (−0.12%)
- 275/45R20 29.74 in (+0.21%)
- 245/55R19 29.61 in (−0.24%)
- 265/70R15 29.61 in (−0.25%)
- 305/40R20 29.61 in (−0.25%)
- 245/60R18 29.57 in (−0.36%)
- 245/65R17 29.54 in (−0.48%)
- 275/50R19 29.83 in (+0.49%)
- 265/60R17 29.52 in (−0.54%)
- 285/35R22 29.85 in (+0.58%)
- 245/70R16 29.50 in (−0.60%)
- 235/75R16 29.88 in (+0.66%)
- 245/75R15 29.47 in (−0.72%)
- 275/55R18 29.91 in (+0.77%)
- 315/30R22 29.44 in (−0.81%)
- 265/50R19 29.43 in (−0.84%)
- 275/25R24 29.41 in (−0.90%)
- 235/70R17 29.95 in (+0.92%)
- 265/45R20 29.39 in (−0.98%)
- 285/40R21 29.98 in (+0.99%)
- 275/60R17 29.99 in (+1.05%)
- 30x9.50R15 30.00 in (+1.07%)
- 265/40R21 29.35 in (−1.13%)
- 235/65R18 30.03 in (+1.17%)
- 255/40R22 30.03 in (+1.18%)
- 235/45R21 29.33 in (−1.19%)
- 255/45R21 30.04 in (+1.19%)
- 255/50R20 30.04 in (+1.21%)
- 255/55R19 30.04 in (+1.22%)
- 255/60R18 30.05 in (+1.23%)
- 255/65R17 30.05 in (+1.25%)
- 255/70R16 30.06 in (+1.26%)
- 265/35R22 29.30 in (−1.27%)
- 295/40R20 29.29 in (−1.31%)
- 225/75R16 29.29 in (−1.33%)
- 285/45R20 30.10 in (+1.41%)
- 235/60R19 30.10 in (+1.42%)
- 235/55R20 30.18 in (+1.67%)
- 235/55R19 29.18 in (−1.70%)
- 295/35R21 29.13 in (−1.86%)
- 235/60R18 29.10 in (−1.95%)
- 285/45R19 29.10 in (−1.96%)
- 225/75R17 30.29 in (+2.04%)
- 295/40R21 30.29 in (+2.06%)
- 255/70R15 29.06 in (−2.11%)
- 255/65R16 29.05 in (−2.12%)
- 255/60R17 29.05 in (−2.14%)
- 255/55R18 29.04 in (−2.15%)
- 255/50R19 29.04 in (−2.16%)
- 255/45R20 29.04 in (−2.18%)
- 255/40R21 29.03 in (−2.19%)
- 235/65R17 29.03 in (−2.20%)
- 255/35R22 29.03 in (−2.20%)
- 265/40R22 30.35 in (+2.24%)
- 285/40R20 28.98 in (−2.37%)
- 215/85R16 30.39 in (+2.39%)
- 265/45R21 30.39 in (+2.39%)
- 295/30R22 28.97 in (−2.40%)
- 305/35R22 30.41 in (+2.44%)
- 235/70R16 28.95 in (−2.45%)
- 265/50R20 30.43 in (+2.53%)
- 295/45R20 30.45 in (+2.60%)
- 245/75R16 30.47 in (+2.65%)
- 265/55R19 30.48 in (+2.68%)
- 235/75R15 28.88 in (−2.71%)
- 245/70R17 30.50 in (+2.77%)
- 285/35R21 28.85 in (−2.79%)
- 265/60R18 30.52 in (+2.83%)
- 245/65R18 30.54 in (+2.89%)
- 265/65R17 30.56 in (+2.97%)
Open 245/45R21 in the tire size calculator
Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.