275/50R21 tire size

A 275/50R21 tire is 31.83 in (808.4 mm) tall and 10.83 in (275.0 mm) wide, and turns 634 revolutions per mile.

• 31.83 inOverall diameter
• 5.41 inSidewall height
• 634Revolutions per mile
• 31.8x10.8R21Flotation equivalent

275/50R21 is a 21-inch tire with a 275 mm (10.83 in) section width and a 50% aspect ratio, giving a 5.41-inch sidewall and a flotation-style size of about 31.8x10.8R21.

Its overall diameter is 31.83 inches, so it rolls 100.0 inches per revolution and turns about 634 times per mile.

48 other sizes in this list are within 3% of that diameter.

Compare 275/50R21 with plausible swaps

• 285/50R20 vs 275/50R21 (−1.90%)
• 265/55R20 vs 275/50R21 (−1.10%)
• 275/55R20 vs 275/50R21 (+0.26%)
• 305/50R20 vs 275/50R21 (+0.57%)
• 255/60R20 vs 275/50R21 (+0.69%)
• 285/55R20 vs 275/50R21 (+1.62%)
• 265/60R20 vs 275/50R21 (+2.18%)
• 275/45R21 vs 275/50R21 (−3.40%)
• 255/50R21 vs 275/50R21 (−2.47%)
• 285/45R21 vs 275/50R21 (−2.29%)
• 265/50R21 vs 275/50R21 (−1.24%)
• 275/50R21 vs 295/40R22 (−1.68%)
• 275/50R21 vs 265/45R22 (−1.37%)
• 275/50R21 vs 305/40R22 (−0.69%)
• 275/50R21 vs 275/45R22 (−0.26%)
• 275/50R21 vs 285/45R22 (+0.85%)

Sizes within 3% of 31.83 in diameter

• 235/80R17 31.80 in (−0.07%)
• 275/55R20 31.91 in (+0.26%)
• 275/45R22 31.74 in (−0.26%)
• 235/85R16 31.73 in (−0.31%)
• 32x11.50R15 32.00 in (+0.54%)
• 265/75R16 31.65 in (−0.56%)
• 305/50R20 32.01 in (+0.57%)
• 265/70R17 31.61 in (−0.69%)
• 255/60R20 32.05 in (+0.69%)
• 305/40R22 31.61 in (−0.69%)
• 255/70R18 32.06 in (+0.72%)
• 255/75R17 32.06 in (+0.73%)
• 285/65R17 31.59 in (−0.75%)
• 275/65R18 32.07 in (+0.78%)
• 265/65R18 31.56 in (−0.83%)
• 285/45R22 32.10 in (+0.85%)
• 295/35R24 32.13 in (+0.95%)
• 275/70R17 32.16 in (+1.04%)
• 265/55R20 31.48 in (−1.10%)
• 245/75R17 31.47 in (−1.13%)
• 285/60R18 31.46 in (−1.14%)
• 265/50R21 31.43 in (−1.24%)
• 265/45R22 31.39 in (−1.37%)
• 285/55R20 32.34 in (+1.62%)
• 295/40R22 31.29 in (−1.68%)
• 305/35R24 32.41 in (+1.82%)
• 285/50R20 31.22 in (−1.90%)
• 305/30R24 31.20 in (−1.95%)
• 265/60R20 32.52 in (+2.18%)
• 285/45R21 31.10 in (−2.29%)
• 275/65R17 31.07 in (−2.36%)
• 285/65R18 32.59 in (+2.39%)
• 255/70R17 31.06 in (−2.42%)
• 255/65R18 31.05 in (−2.44%)
• 265/70R18 32.61 in (+2.45%)
• 255/60R19 31.05 in (−2.45%)
• 305/65R17 32.61 in (+2.46%)
• 255/55R20 31.04 in (−2.46%)
• 255/50R21 31.04 in (−2.47%)
• 235/65R19 31.03 in (−2.51%)
• 31x10.50R15 31.00 in (−2.60%)
• 31x10.50R16 31.00 in (−2.60%)
• 275/60R18 30.99 in (−2.62%)
• 285/40R22 30.98 in (−2.67%)
• 285/70R17 32.71 in (+2.77%)
• 275/55R19 30.91 in (−2.88%)
• 235/75R17 30.88 in (−2.98%)
• 295/55R20 32.78 in (+2.98%)

Open 275/50R21 in the tire size calculator

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.