265/40R21 tire size

A 265/40R21 tire is 29.35 in (745.4 mm) tall and 10.43 in (265.0 mm) wide, and turns 687 revolutions per mile.

• 29.35 inOverall diameter
• 4.17 inSidewall height
• 687Revolutions per mile
• 29.3x10.4R21Flotation equivalent

265/40R21 is a 21-inch tire with a 265 mm (10.43 in) section width and a 40% aspect ratio, giving a 4.17-inch sidewall and a flotation-style size of about 29.3x10.4R21.

Its overall diameter is 29.35 inches, so it rolls 92.2 inches per revolution and turns about 687 times per mile.

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

Compare 265/40R21 with plausible swaps

• 255/50R19 vs 265/40R21 (−1.05%)
• 285/45R19 vs 265/40R21 (−0.85%)
• 235/55R19 vs 265/40R21 (−0.58%)
• 265/50R19 vs 265/40R21 (+0.30%)
• 245/55R19 vs 265/40R21 (+0.90%)
• 255/45R20 vs 265/40R21 (−1.06%)
• 295/40R20 vs 265/40R21 (−0.19%)
• 265/45R20 vs 265/40R21 (+0.15%)
• 305/40R20 vs 265/40R21 (+0.89%)
• 245/50R20 vs 265/40R21 (+1.02%)
• 265/35R21 vs 265/40R21 (−3.56%)
• 245/40R21 vs 265/40R21 (−2.15%)
• 255/40R21 vs 265/40R21 (−1.07%)
• 295/35R21 vs 265/40R21 (−0.74%)
• 235/45R21 vs 265/40R21 (−0.07%)
• 265/40R21 vs 275/40R21 (+1.07%)
• 265/40R21 vs 245/45R21 (+1.14%)
• 265/40R21 vs 315/35R21 (+1.14%)
• 265/40R21 vs 285/40R21 (+2.15%)
• 265/40R21 vs 265/45R21 (+3.56%)
• 265/40R21 vs 255/35R22 (−1.09%)
• 265/40R21 vs 265/35R22 (−0.15%)
• 265/40R21 vs 315/30R22 (+0.32%)

Sizes within 3% of 29.35 in diameter

• 235/45R21 29.33 in (−0.07%)
• 265/45R20 29.39 in (+0.15%)
• 265/35R22 29.30 in (−0.15%)
• 295/40R20 29.29 in (−0.19%)
• 225/75R16 29.29 in (−0.20%)
• 275/25R24 29.41 in (+0.23%)
• 265/50R19 29.43 in (+0.30%)
• 315/30R22 29.44 in (+0.32%)
• 245/75R15 29.47 in (+0.42%)
• 245/70R16 29.50 in (+0.54%)
• 235/55R19 29.18 in (−0.58%)
• 265/60R17 29.52 in (+0.59%)
• 245/65R17 29.54 in (+0.66%)
• 295/35R21 29.13 in (−0.74%)
• 245/60R18 29.57 in (+0.78%)
• 235/60R18 29.10 in (−0.83%)
• 285/45R19 29.10 in (−0.85%)
• 265/70R15 29.61 in (+0.89%)
• 305/40R20 29.61 in (+0.89%)
• 245/55R19 29.61 in (+0.90%)
• 255/70R15 29.06 in (−0.99%)
• 255/65R16 29.05 in (−1.01%)
• 255/60R17 29.05 in (−1.02%)
• 245/50R20 29.65 in (+1.02%)
• 255/55R18 29.04 in (−1.03%)
• 255/50R19 29.04 in (−1.05%)
• 255/45R20 29.04 in (−1.06%)
• 255/40R21 29.03 in (−1.07%)
• 275/40R21 29.66 in (+1.07%)
• 235/65R17 29.03 in (−1.09%)
• 255/35R22 29.03 in (−1.09%)
• 245/45R21 29.68 in (+1.14%)
• 315/35R21 29.68 in (+1.14%)
• 285/40R20 28.98 in (−1.26%)
• 295/30R22 28.97 in (−1.29%)
• 235/70R16 28.95 in (−1.34%)
• 275/45R20 29.74 in (+1.35%)
• 235/75R15 28.88 in (−1.60%)
• 275/50R19 29.83 in (+1.64%)
• 285/35R21 28.85 in (−1.68%)
• 285/35R22 29.85 in (+1.73%)
• 235/75R16 29.88 in (+1.81%)
• 275/55R18 29.91 in (+1.92%)
• 245/35R22 28.75 in (−2.03%)
• 225/55R19 28.74 in (−2.05%)
• 275/45R19 28.74 in (−2.05%)
• 235/70R17 29.95 in (+2.07%)
• 285/30R22 28.73 in (−2.09%)
• 245/40R21 28.72 in (−2.15%)
• 285/40R21 29.98 in (+2.15%)
• 275/60R17 29.99 in (+2.20%)
• 215/75R16 28.70 in (−2.21%)
• 30x9.50R15 30.00 in (+2.23%)
• 245/45R20 28.68 in (−2.27%)
• 315/35R20 28.68 in (−2.27%)
• 325/30R21 28.68 in (−2.28%)
• 235/65R18 30.03 in (+2.32%)
• 275/40R20 28.66 in (−2.33%)
• 255/40R22 30.03 in (+2.33%)
• 255/45R21 30.04 in (+2.35%)
• 255/50R20 30.04 in (+2.36%)
• 255/55R19 30.04 in (+2.37%)
• 255/60R18 30.05 in (+2.39%)
• 245/50R19 28.65 in (−2.39%)
• 255/65R17 30.05 in (+2.40%)
• 255/70R16 30.06 in (+2.41%)
• 225/60R18 28.63 in (−2.44%)
• 245/55R18 28.61 in (−2.51%)
• 285/45R20 30.10 in (+2.56%)
• 235/60R19 30.10 in (+2.58%)
• 275/35R21 28.58 in (−2.62%)
• 245/60R17 28.57 in (−2.63%)
• 245/65R16 28.54 in (−2.75%)
• 225/65R17 28.52 in (−2.83%)
• 235/55R20 30.18 in (+2.83%)
• 275/30R22 28.50 in (−2.90%)

Open 265/40R21 in the tire size calculator

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