TireSizesFinder

265/35R21 vs 255/30R22

255/30R22 is 0.28 in (7.1 mm) shorter than 265/35R21, a −0.99% diameter difference. With the speedometer set for 265/35R21, an indicated 60 mph is 59.4 mph on 255/30R22.

Is this a safe swap?

Diameter difference −0.99%: under 1%

By overall diameter alone, 255/30R22 is a near match for 265/35R21; 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: 265/35R21 (28.30 in) vs 255/30R22 (28.02 in)265/35R2128.30 in × 10.43 in255/30R2228.02 in × 10.04 in
Side profile and tread width, drawn to the same scale.
265/35R21 vs 255/30R22 differences
Measurement265/35R21255/30R22Difference% diff
Overall diameter28.30 in (718.9 mm)28.02 in (711.8 mm)−0.28 in (−7.1 mm)−0.99%
Sidewall height3.65 in (92.8 mm)3.01 in (76.5 mm)−0.64 in (−16.2 mm)−17.52%
Section width10.43 in (265.0 mm)10.04 in (255.0 mm)−0.39 in (−10.0 mm)−3.77%
Circumference88.92 in (2,258.5 mm)88.04 in (2,236.2 mm)−0.88 in (−22.3 mm)−0.99%
Revolutions per mile713720+7+1.00%
True speed with the speedometer calibrated for 265/35R21
IndicatedActual on 265/35R21Actual on 255/30R22Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.3 mph−0.7 mph

Ride-height change: 255/30R22 lowers the vehicle by 0.14 in (3.6 mm) at the axle (half the −7.1 mm diameter difference).

255/30R22 is 0.28 in shorter than 265/35R21 and 10 mm narrower, a 0.99% difference in overall diameter.

With the speedometer calibrated for 265/35R21, an indicated 60 mph is actually 59.4 mph on 255/30R22, and revolutions per mile change from 713 to 720.

255/30R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 265/35R21.

Size pages

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