TireSizesFinder

285/40R21 vs 265/40R22

265/40R22 is 0.37 in (9.4 mm) taller than 285/40R21, a +1.23% diameter difference. With the speedometer set for 285/40R21, an indicated 60 mph is 60.7 mph on 265/40R22.

Is this a safe swap?

Diameter difference +1.23%: within the ±3% guideline

By overall diameter alone, 265/40R22 falls inside the ±3% range commonly used as a guideline when replacing 285/40R21. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 285/40R21 (29.98 in) vs 265/40R22 (30.35 in)285/40R2129.98 in × 11.22 in265/40R2230.35 in × 10.43 in
Side profile and tread width, drawn to the same scale.
285/40R21 vs 265/40R22 differences
Measurement285/40R21265/40R22Difference% diff
Overall diameter29.98 in (761.4 mm)30.35 in (770.8 mm)+0.37 in (+9.4 mm)+1.23%
Sidewall height4.49 in (114.0 mm)4.17 in (106.0 mm)−0.31 in (−8.0 mm)−7.02%
Section width11.22 in (285.0 mm)10.43 in (265.0 mm)−0.79 in (−20.0 mm)−7.02%
Circumference94.17 in (2,392.0 mm)95.34 in (2,421.5 mm)+1.16 in (+29.5 mm)+1.23%
Revolutions per mile673665−8−1.22%
True speed with the speedometer calibrated for 285/40R21
IndicatedActual on 285/40R21Actual on 265/40R22Difference
30 mph30.0 mph30.4 mph+0.4 mph
60 mph60.0 mph60.7 mph+0.7 mph
75 mph75.0 mph75.9 mph+0.9 mph

Ride-height change: 265/40R22 raises the vehicle by 0.19 in (4.7 mm) at the axle (half the +9.4 mm diameter difference).

265/40R22 is 0.37 in taller than 285/40R21 and 20 mm narrower, a 1.23% difference in overall diameter.

With the speedometer calibrated for 285/40R21, an indicated 60 mph is actually 60.7 mph on 265/40R22, and revolutions per mile change from 673 to 665.

265/40R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 285/40R21.

Size pages

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