225/50R19 vs 295/30R21

295/30R21 is 0.11 in (2.8 mm) taller than 225/50R19, a +0.40% diameter difference. With the speedometer set for 225/50R19, an indicated 60 mph is 60.2 mph on 295/30R21.

Is this a safe swap?

Diameter difference +0.40%: under 1%

By overall diameter alone, 295/30R21 is a near match for 225/50R19; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

225/50R19 vs 295/30R21 differences
Measurement	225/50R19	295/30R21	Difference	% diff
Overall diameter	27.86 in (707.6 mm)	27.97 in (710.4 mm)	+0.11 in (+2.8 mm)	+0.40%
Sidewall height	4.43 in (112.5 mm)	3.48 in (88.5 mm)	−0.94 in (−24.0 mm)	−21.33%
Section width	8.86 in (225.0 mm)	11.61 in (295.0 mm)	+2.76 in (+70.0 mm)	+31.11%
Circumference	87.52 in (2,223.0 mm)	87.87 in (2,231.8 mm)	+0.35 in (+8.8 mm)	+0.40%
Revolutions per mile	724	721	−3	−0.39%

True speed with the speedometer calibrated for 225/50R19
Indicated	Actual on 225/50R19	Actual on 295/30R21	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.2 mph	+0.2 mph
75 mph	75.0 mph	75.3 mph	+0.3 mph

Ride-height change: 295/30R21 raises the vehicle by 0.06 in (1.4 mm) at the axle (half the +2.8 mm diameter difference).

295/30R21 is 0.11 in taller than 225/50R19 and 70 mm wider, a 0.40% difference in overall diameter.

With the speedometer calibrated for 225/50R19, an indicated 60 mph is actually 60.2 mph on 295/30R21, and revolutions per mile change from 724 to 721.

295/30R21 mounts on a 21-inch wheel, a plus-2 fitment from the 19-inch wheel of 225/50R19.

Size pages

Other comparisons with 225/50R19

Other comparisons with 295/30R21

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.