TireSizesFinder

305/45R20 vs 295/40R22

295/40R22 is 0.48 in (12.3 mm) taller than 305/45R20, a +1.57% diameter difference. With the speedometer set for 305/45R20, an indicated 60 mph is 60.9 mph on 295/40R22.

Is this a safe swap?

Diameter difference +1.57%: within the ±3% guideline

By overall diameter alone, 295/40R22 falls inside the ±3% range commonly used as a guideline when replacing 305/45R20. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 305/45R20 (30.81 in) vs 295/40R22 (31.29 in)305/45R2030.81 in × 12.01 in295/40R2231.29 in × 11.61 in
Side profile and tread width, drawn to the same scale.
305/45R20 vs 295/40R22 differences
Measurement305/45R20295/40R22Difference% diff
Overall diameter30.81 in (782.5 mm)31.29 in (794.8 mm)+0.48 in (+12.3 mm)+1.57%
Sidewall height5.40 in (137.3 mm)4.65 in (118.0 mm)−0.76 in (−19.2 mm)−14.03%
Section width12.01 in (305.0 mm)11.61 in (295.0 mm)−0.39 in (−10.0 mm)−3.28%
Circumference96.78 in (2,458.3 mm)98.30 in (2,496.9 mm)+1.52 in (+38.6 mm)+1.57%
Revolutions per mile655645−10−1.55%
True speed with the speedometer calibrated for 305/45R20
IndicatedActual on 305/45R20Actual on 295/40R22Difference
30 mph30.0 mph30.5 mph+0.5 mph
60 mph60.0 mph60.9 mph+0.9 mph
75 mph75.0 mph76.2 mph+1.2 mph

Ride-height change: 295/40R22 raises the vehicle by 0.24 in (6.1 mm) at the axle (half the +12.3 mm diameter difference).

295/40R22 is 0.48 in taller than 305/45R20 and 10 mm narrower, a 1.57% difference in overall diameter.

With the speedometer calibrated for 305/45R20, an indicated 60 mph is actually 60.9 mph on 295/40R22, and revolutions per mile change from 655 to 645.

295/40R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 305/45R20.

Size pages

Other comparisons with 305/45R20

Other comparisons with 295/40R22

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