TireSizesFinder

265/55R19 vs 295/40R21

295/40R21 is 0.19 in (4.7 mm) shorter than 265/55R19, a −0.61% diameter difference. With the speedometer set for 265/55R19, an indicated 60 mph is 59.6 mph on 295/40R21.

Is this a safe swap?

Diameter difference −0.61%: under 1%

By overall diameter alone, 295/40R21 is a near match for 265/55R19; 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: 265/55R19 (30.48 in) vs 295/40R21 (30.29 in)265/55R1930.48 in × 10.43 in295/40R2130.29 in × 11.61 in
Side profile and tread width, drawn to the same scale.
265/55R19 vs 295/40R21 differences
Measurement265/55R19295/40R21Difference% diff
Overall diameter30.48 in (774.1 mm)30.29 in (769.4 mm)−0.19 in (−4.7 mm)−0.61%
Sidewall height5.74 in (145.8 mm)4.65 in (118.0 mm)−1.09 in (−27.7 mm)−19.04%
Section width10.43 in (265.0 mm)11.61 in (295.0 mm)+1.18 in (+30.0 mm)+11.32%
Circumference95.74 in (2,431.9 mm)95.16 in (2,417.1 mm)−0.58 in (−14.8 mm)−0.61%
Revolutions per mile662666+4+0.61%
True speed with the speedometer calibrated for 265/55R19
IndicatedActual on 265/55R19Actual on 295/40R21Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.5 mph−0.5 mph

Ride-height change: 295/40R21 lowers the vehicle by 0.09 in (2.3 mm) at the axle (half the −4.7 mm diameter difference).

295/40R21 is 0.19 in shorter than 265/55R19 and 30 mm wider, a 0.61% difference in overall diameter.

With the speedometer calibrated for 265/55R19, an indicated 60 mph is actually 59.6 mph on 295/40R21, and revolutions per mile change from 662 to 666.

295/40R21 mounts on a 21-inch wheel, a plus-2 fitment from the 19-inch wheel of 265/55R19.

Size pages

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