TireSizesFinder

235/60R19 vs 295/40R21

295/40R21 is 0.19 in (4.8 mm) taller than 235/60R19, a +0.63% diameter difference. With the speedometer set for 235/60R19, an indicated 60 mph is 60.4 mph on 295/40R21.

Is this a safe swap?

Diameter difference +0.63%: under 1%

By overall diameter alone, 295/40R21 is a near match for 235/60R19; 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: 235/60R19 (30.10 in) vs 295/40R21 (30.29 in)235/60R1930.10 in × 9.25 in295/40R2130.29 in × 11.61 in
Side profile and tread width, drawn to the same scale.
235/60R19 vs 295/40R21 differences
Measurement235/60R19295/40R21Difference% diff
Overall diameter30.10 in (764.6 mm)30.29 in (769.4 mm)+0.19 in (+4.8 mm)+0.63%
Sidewall height5.55 in (141.0 mm)4.65 in (118.0 mm)−0.91 in (−23.0 mm)−16.31%
Section width9.25 in (235.0 mm)11.61 in (295.0 mm)+2.36 in (+60.0 mm)+25.53%
Circumference94.57 in (2,402.1 mm)95.16 in (2,417.1 mm)+0.59 in (+15.1 mm)+0.63%
Revolutions per mile670666−4−0.62%
True speed with the speedometer calibrated for 235/60R19
IndicatedActual on 235/60R19Actual on 295/40R21Difference
30 mph30.0 mph30.2 mph+0.2 mph
60 mph60.0 mph60.4 mph+0.4 mph
75 mph75.0 mph75.5 mph+0.5 mph

Ride-height change: 295/40R21 raises the vehicle by 0.09 in (2.4 mm) at the axle (half the +4.8 mm diameter difference).

295/40R21 is 0.19 in taller than 235/60R19 and 60 mm wider, a 0.63% difference in overall diameter.

With the speedometer calibrated for 235/60R19, an indicated 60 mph is actually 60.4 mph on 295/40R21, and revolutions per mile change from 670 to 666.

295/40R21 mounts on a 21-inch wheel, a plus-2 fitment from the 19-inch wheel of 235/60R19.

Size pages

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