TireSizesFinder

295/40R21 vs 285/35R22

285/35R22 is 0.44 in (11.1 mm) shorter than 295/40R21, a −1.44% diameter difference. With the speedometer set for 295/40R21, an indicated 60 mph is 59.1 mph on 285/35R22.

Is this a safe swap?

Diameter difference −1.44%: within the ±3% guideline

By overall diameter alone, 285/35R22 falls inside the ±3% range commonly used as a guideline when replacing 295/40R21. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 295/40R21 (30.29 in) vs 285/35R22 (29.85 in)295/40R2130.29 in × 11.61 in285/35R2229.85 in × 11.22 in
Side profile and tread width, drawn to the same scale.
295/40R21 vs 285/35R22 differences
Measurement295/40R21285/35R22Difference% diff
Overall diameter30.29 in (769.4 mm)29.85 in (758.3 mm)−0.44 in (−11.1 mm)−1.44%
Sidewall height4.65 in (118.0 mm)3.93 in (99.8 mm)−0.72 in (−18.2 mm)−15.47%
Section width11.61 in (295.0 mm)11.22 in (285.0 mm)−0.39 in (−10.0 mm)−3.39%
Circumference95.16 in (2,417.1 mm)93.79 in (2,382.3 mm)−1.37 in (−34.9 mm)−1.44%
Revolutions per mile666676+10+1.46%
True speed with the speedometer calibrated for 295/40R21
IndicatedActual on 295/40R21Actual on 285/35R22Difference
30 mph30.0 mph29.6 mph−0.4 mph
60 mph60.0 mph59.1 mph−0.9 mph
75 mph75.0 mph73.9 mph−1.1 mph

Ride-height change: 285/35R22 lowers the vehicle by 0.22 in (5.6 mm) at the axle (half the −11.1 mm diameter difference).

285/35R22 is 0.44 in shorter than 295/40R21 and 10 mm narrower, a 1.44% difference in overall diameter.

With the speedometer calibrated for 295/40R21, an indicated 60 mph is actually 59.1 mph on 285/35R22, and revolutions per mile change from 666 to 676.

285/35R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 295/40R21.

Size pages

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