TireSizesFinder

255/40R21 vs 265/35R22

265/35R22 is 0.27 in (6.9 mm) taller than 255/40R21, a +0.94% diameter difference. With the speedometer set for 255/40R21, an indicated 60 mph is 60.6 mph on 265/35R22.

Is this a safe swap?

Diameter difference +0.94%: under 1%

By overall diameter alone, 265/35R22 is a near match for 255/40R21; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 255/40R21 (29.03 in) vs 265/35R22 (29.30 in)255/40R2129.03 in × 10.04 in265/35R2229.30 in × 10.43 in
Side profile and tread width, drawn to the same scale.
255/40R21 vs 265/35R22 differences
Measurement255/40R21265/35R22Difference% diff
Overall diameter29.03 in (737.4 mm)29.30 in (744.3 mm)+0.27 in (+6.9 mm)+0.94%
Sidewall height4.02 in (102.0 mm)3.65 in (92.8 mm)−0.36 in (−9.2 mm)−9.07%
Section width10.04 in (255.0 mm)10.43 in (265.0 mm)+0.39 in (+10.0 mm)+3.92%
Circumference91.21 in (2,316.6 mm)92.06 in (2,338.3 mm)+0.85 in (+21.7 mm)+0.94%
Revolutions per mile695688−6−0.93%
True speed with the speedometer calibrated for 255/40R21
IndicatedActual on 255/40R21Actual on 265/35R22Difference
30 mph30.0 mph30.3 mph+0.3 mph
60 mph60.0 mph60.6 mph+0.6 mph
75 mph75.0 mph75.7 mph+0.7 mph

Ride-height change: 265/35R22 raises the vehicle by 0.14 in (3.4 mm) at the axle (half the +6.9 mm diameter difference).

265/35R22 is 0.27 in taller than 255/40R21 and 10 mm wider, a 0.94% difference in overall diameter.

With the speedometer calibrated for 255/40R21, an indicated 60 mph is actually 60.6 mph on 265/35R22, and revolutions per mile change from 695 to 688.

265/35R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 255/40R21.

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.