TireSizesFinder

295/40R22 vs 305/30R24

305/30R24 is 0.09 in (2.2 mm) shorter than 295/40R22, a −0.28% diameter difference. With the speedometer set for 295/40R22, an indicated 60 mph is 59.8 mph on 305/30R24.

Is this a safe swap?

Diameter difference −0.28%: under 1%

By overall diameter alone, 305/30R24 is a near match for 295/40R22; 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: 295/40R22 (31.29 in) vs 305/30R24 (31.20 in)295/40R2231.29 in × 11.61 in305/30R2431.20 in × 12.01 in
Side profile and tread width, drawn to the same scale.
295/40R22 vs 305/30R24 differences
Measurement295/40R22305/30R24Difference% diff
Overall diameter31.29 in (794.8 mm)31.20 in (792.6 mm)−0.09 in (−2.2 mm)−0.28%
Sidewall height4.65 in (118.0 mm)3.60 in (91.5 mm)−1.04 in (−26.5 mm)−22.46%
Section width11.61 in (295.0 mm)12.01 in (305.0 mm)+0.39 in (+10.0 mm)+3.39%
Circumference98.30 in (2,496.9 mm)98.03 in (2,490.0 mm)−0.27 in (−6.9 mm)−0.28%
Revolutions per mile645646+2+0.28%
True speed with the speedometer calibrated for 295/40R22
IndicatedActual on 295/40R22Actual on 305/30R24Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.8 mph−0.2 mph
75 mph75.0 mph74.8 mph−0.2 mph

Ride-height change: 305/30R24 lowers the vehicle by 0.04 in (1.1 mm) at the axle (half the −2.2 mm diameter difference).

305/30R24 is 0.09 in shorter than 295/40R22 and 10 mm wider, a 0.28% difference in overall diameter.

With the speedometer calibrated for 295/40R22, an indicated 60 mph is actually 59.8 mph on 305/30R24, and revolutions per mile change from 645 to 646.

305/30R24 mounts on a 24-inch wheel, a plus-2 fitment from the 22-inch wheel of 295/40R22.

Size pages

Other comparisons with 295/40R22

Other comparisons with 305/30R24

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