275/35R21 tire size

A 275/35R21 tire is 28.58 in (725.9 mm) tall and 10.83 in (275.0 mm) wide, and turns 706 revolutions per mile.

• 28.58 inOverall diameter
• 3.79 inSidewall height
• 706Revolutions per mile
• 28.6x10.8R21Flotation equivalent

275/35R21 is a 21-inch tire with a 275 mm (10.83 in) section width and a 35% aspect ratio, giving a 3.79-inch sidewall and a flotation-style size of about 28.6x10.8R21.

Its overall diameter is 28.58 inches, so it rolls 89.8 inches per revolution and turns about 706 times per mile.

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

Compare 275/35R21 with plausible swaps

• 265/45R19 vs 275/35R21 (−0.66%)
• 245/50R19 vs 275/35R21 (+0.23%)
• 225/55R19 vs 275/35R21 (+0.58%)
• 275/45R19 vs 275/35R21 (+0.58%)
• 235/45R20 vs 275/35R21 (−0.88%)
• 265/40R20 vs 275/35R21 (−0.81%)
• 275/40R20 vs 275/35R21 (+0.29%)
• 245/45R20 vs 275/35R21 (+0.36%)
• 315/35R20 vs 275/35R21 (+0.36%)
• 275/30R21 vs 275/35R21 (−3.79%)
• 255/35R21 vs 275/35R21 (−1.93%)
• 265/35R21 vs 275/35R21 (−0.96%)
• 275/35R21 vs 325/30R21 (+0.34%)
• 275/35R21 vs 245/40R21 (+0.48%)
• 275/35R21 vs 285/35R21 (+0.96%)
• 275/35R21 vs 295/35R21 (+1.93%)
• 275/35R21 vs 275/40R21 (+3.79%)
• 275/35R21 vs 265/30R22 (−1.12%)
• 275/35R21 vs 275/30R22 (−0.29%)
• 275/35R21 vs 285/30R22 (+0.54%)
• 275/35R21 vs 245/35R22 (+0.61%)

Sizes within 3% of 28.58 in diameter

• 245/60R17 28.57 in (−0.01%)
• 245/55R18 28.61 in (+0.11%)
• 245/65R16 28.54 in (−0.14%)
• 225/60R18 28.63 in (+0.18%)
• 225/65R17 28.52 in (−0.22%)
• 245/50R19 28.65 in (+0.23%)
• 275/40R20 28.66 in (+0.29%)
• 275/30R22 28.50 in (−0.29%)
• 325/30R21 28.68 in (+0.34%)
• 245/45R20 28.68 in (+0.36%)
• 315/35R20 28.68 in (+0.36%)
• 215/75R16 28.70 in (+0.41%)
• 245/40R21 28.72 in (+0.48%)
• 265/50R18 28.43 in (−0.51%)
• 285/30R22 28.73 in (+0.54%)
• 225/55R19 28.74 in (+0.58%)
• 275/45R19 28.74 in (+0.58%)
• 245/35R22 28.75 in (+0.61%)
• 225/70R16 28.40 in (−0.62%)
• 265/45R19 28.39 in (−0.66%)
• 265/40R20 28.35 in (−0.81%)
• 235/45R20 28.33 in (−0.88%)
• 265/35R21 28.30 in (−0.96%)
• 285/35R21 28.85 in (+0.96%)
• 295/40R19 28.29 in (−1.01%)
• 225/75R15 28.29 in (−1.02%)
• 235/75R15 28.88 in (+1.05%)
• 265/30R22 28.26 in (−1.12%)
• 235/50R19 28.25 in (−1.14%)
• 235/70R16 28.95 in (+1.31%)
• 305/30R21 28.20 in (−1.31%)
• 295/30R22 28.97 in (+1.36%)
• 285/40R20 28.98 in (+1.39%)
• 235/55R18 28.18 in (−1.41%)
• 235/65R17 29.03 in (+1.57%)
• 295/35R20 28.13 in (−1.57%)
• 255/35R22 29.03 in (+1.57%)
• 255/40R21 29.03 in (+1.58%)
• 255/45R20 29.04 in (+1.60%)
• 255/50R19 29.04 in (+1.61%)
• 255/55R18 29.04 in (+1.63%)
• 255/60R17 29.05 in (+1.64%)
• 205/75R16 28.11 in (−1.65%)
• 255/65R16 29.05 in (+1.65%)
• 255/70R15 29.06 in (+1.67%)
• 235/60R17 28.10 in (−1.67%)
• 285/45R18 28.10 in (−1.68%)
• 285/45R19 29.10 in (+1.82%)
• 235/60R18 29.10 in (+1.83%)
• 255/50R18 28.04 in (−1.89%)
• 255/45R19 28.04 in (−1.90%)
• 255/40R20 28.03 in (−1.91%)
• 235/65R16 28.03 in (−1.93%)
• 255/35R21 28.03 in (−1.93%)
• 295/35R21 29.13 in (+1.93%)
• 255/30R22 28.02 in (−1.94%)
• 215/65R17 28.00 in (−2.01%)
• 235/55R19 29.18 in (+2.09%)
• 285/40R19 27.98 in (−2.11%)
• 295/30R21 27.97 in (−2.14%)
• 235/70R15 27.95 in (−2.19%)
• 225/75R16 29.29 in (+2.48%)
• 295/40R20 29.29 in (+2.49%)
• 225/50R19 27.86 in (−2.52%)
• 285/35R20 27.85 in (−2.53%)
• 265/35R22 29.30 in (+2.53%)
• 215/70R16 27.85 in (−2.55%)
• 235/45R21 29.33 in (+2.62%)
• 265/40R21 29.35 in (+2.69%)
• 295/25R22 27.81 in (−2.70%)
• 245/30R22 27.79 in (−2.77%)
• 265/45R20 29.39 in (+2.84%)
• 245/35R21 27.75 in (−2.89%)
• 225/55R18 27.74 in (−2.92%)
• 275/45R18 27.74 in (−2.92%)
• 275/25R24 29.41 in (+2.92%)
• 265/50R19 29.43 in (+2.99%)

Open 275/35R21 in the tire size calculator

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