TireSizesFinder

265/40R21 vs 255/35R22

255/35R22 is 0.32 in (8.1 mm) shorter than 265/40R21, a −1.09% diameter difference. With the speedometer set for 265/40R21, an indicated 60 mph is 59.3 mph on 255/35R22.

Is this a safe swap?

Diameter difference −1.09%: within the ±3% guideline

By overall diameter alone, 255/35R22 falls inside the ±3% range commonly used as a guideline when replacing 265/40R21. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 265/40R21 (29.35 in) vs 255/35R22 (29.03 in)265/40R2129.35 in × 10.43 in255/35R2229.03 in × 10.04 in
Side profile and tread width, drawn to the same scale.
265/40R21 vs 255/35R22 differences
Measurement265/40R21255/35R22Difference% diff
Overall diameter29.35 in (745.4 mm)29.03 in (737.3 mm)−0.32 in (−8.1 mm)−1.09%
Sidewall height4.17 in (106.0 mm)3.51 in (89.3 mm)−0.66 in (−16.7 mm)−15.80%
Section width10.43 in (265.0 mm)10.04 in (255.0 mm)−0.39 in (−10.0 mm)−3.77%
Circumference92.19 in (2,341.7 mm)91.19 in (2,316.3 mm)−1.00 in (−25.4 mm)−1.09%
Revolutions per mile687695+8+1.10%
True speed with the speedometer calibrated for 265/40R21
IndicatedActual on 265/40R21Actual on 255/35R22Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.3 mph−0.7 mph
75 mph75.0 mph74.2 mph−0.8 mph

Ride-height change: 255/35R22 lowers the vehicle by 0.16 in (4.1 mm) at the axle (half the −8.1 mm diameter difference).

255/35R22 is 0.32 in shorter than 265/40R21 and 10 mm narrower, a 1.09% difference in overall diameter.

With the speedometer calibrated for 265/40R21, an indicated 60 mph is actually 59.3 mph on 255/35R22, and revolutions per mile change from 687 to 695.

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

Size pages

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