TireSizesFinder

255/40R22 vs 275/25R24

275/25R24 is 0.62 in (15.7 mm) shorter than 255/40R22, a −2.06% diameter difference. With the speedometer set for 255/40R22, an indicated 60 mph is 58.8 mph on 275/25R24.

Is this a safe swap?

Diameter difference −2.06%: within the ±3% guideline

By overall diameter alone, 275/25R24 falls inside the ±3% range commonly used as a guideline when replacing 255/40R22. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 255/40R22 (30.03 in) vs 275/25R24 (29.41 in)255/40R2230.03 in × 10.04 in275/25R2429.41 in × 10.83 in
Side profile and tread width, drawn to the same scale.
255/40R22 vs 275/25R24 differences
Measurement255/40R22275/25R24Difference% diff
Overall diameter30.03 in (762.8 mm)29.41 in (747.1 mm)−0.62 in (−15.7 mm)−2.06%
Sidewall height4.02 in (102.0 mm)2.71 in (68.8 mm)−1.31 in (−33.2 mm)−32.60%
Section width10.04 in (255.0 mm)10.83 in (275.0 mm)+0.79 in (+20.0 mm)+7.84%
Circumference94.35 in (2,396.4 mm)92.40 in (2,347.1 mm)−1.94 in (−49.3 mm)−2.06%
Revolutions per mile672686+14+2.10%
True speed with the speedometer calibrated for 255/40R22
IndicatedActual on 255/40R22Actual on 275/25R24Difference
30 mph30.0 mph29.4 mph−0.6 mph
60 mph60.0 mph58.8 mph−1.2 mph
75 mph75.0 mph73.5 mph−1.5 mph

Ride-height change: 275/25R24 lowers the vehicle by 0.31 in (7.9 mm) at the axle (half the −15.7 mm diameter difference).

275/25R24 is 0.62 in shorter than 255/40R22 and 20 mm wider, a 2.06% difference in overall diameter.

With the speedometer calibrated for 255/40R22, an indicated 60 mph is actually 58.8 mph on 275/25R24, and revolutions per mile change from 672 to 686.

275/25R24 mounts on a 24-inch wheel, a plus-2 fitment from the 22-inch wheel of 255/40R22.

Size pages

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