TireSizesFinder

305/35R22 vs 275/40R22

275/40R22 is 0.26 in (6.5 mm) taller than 305/35R22, a +0.84% diameter difference. With the speedometer set for 305/35R22, an indicated 60 mph is 60.5 mph on 275/40R22.

Is this a safe swap?

Diameter difference +0.84%: under 1%

By overall diameter alone, 275/40R22 is a near match for 305/35R22; 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: 305/35R22 (30.41 in) vs 275/40R22 (30.66 in)305/35R2230.41 in × 12.01 in275/40R2230.66 in × 10.83 in
Side profile and tread width, drawn to the same scale.
305/35R22 vs 275/40R22 differences
Measurement305/35R22275/40R22Difference% diff
Overall diameter30.41 in (772.3 mm)30.66 in (778.8 mm)+0.26 in (+6.5 mm)+0.84%
Sidewall height4.20 in (106.8 mm)4.33 in (110.0 mm)+0.13 in (+3.3 mm)+3.04%
Section width12.01 in (305.0 mm)10.83 in (275.0 mm)−1.18 in (−30.0 mm)−9.84%
Circumference95.52 in (2,426.3 mm)96.33 in (2,446.7 mm)+0.80 in (+20.4 mm)+0.84%
Revolutions per mile663658−6−0.83%
True speed with the speedometer calibrated for 305/35R22
IndicatedActual on 305/35R22Actual on 275/40R22Difference
30 mph30.0 mph30.3 mph+0.3 mph
60 mph60.0 mph60.5 mph+0.5 mph
75 mph75.0 mph75.6 mph+0.6 mph

Ride-height change: 275/40R22 raises the vehicle by 0.13 in (3.3 mm) at the axle (half the +6.5 mm diameter difference).

275/40R22 is 0.26 in taller than 305/35R22 and 30 mm narrower, a 0.84% difference in overall diameter.

With the speedometer calibrated for 305/35R22, an indicated 60 mph is actually 60.5 mph on 275/40R22, and revolutions per mile change from 663 to 658.

Both sizes mount on 22-inch wheels.

Size pages

Other comparisons with 305/35R22

Other comparisons with 275/40R22

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