265/45R22 vs 305/30R24

305/30R24 is 0.19 in (4.7 mm) shorter than 265/45R22, a −0.59% diameter difference. With the speedometer set for 265/45R22, an indicated 60 mph is 59.6 mph on 305/30R24.

Is this a safe swap?

Diameter difference −0.59%: under 1%

By overall diameter alone, 305/30R24 is a near match for 265/45R22; 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.

265/45R22 vs 305/30R24 differences
Measurement	265/45R22	305/30R24	Difference	% diff
Overall diameter	31.39 in (797.3 mm)	31.20 in (792.6 mm)	−0.19 in (−4.7 mm)	−0.59%
Sidewall height	4.69 in (119.3 mm)	3.60 in (91.5 mm)	−1.09 in (−27.7 mm)	−23.27%
Section width	10.43 in (265.0 mm)	12.01 in (305.0 mm)	+1.57 in (+40.0 mm)	+15.09%
Circumference	98.61 in (2,504.8 mm)	98.03 in (2,490.0 mm)	−0.58 in (−14.8 mm)	−0.59%
Revolutions per mile	643	646	+4	+0.59%

True speed with the speedometer calibrated for 265/45R22
Indicated	Actual on 265/45R22	Actual on 305/30R24	Difference
30 mph	30.0 mph	29.8 mph	−0.2 mph
60 mph	60.0 mph	59.6 mph	−0.4 mph
75 mph	75.0 mph	74.6 mph	−0.4 mph

Ride-height change: 305/30R24 lowers the vehicle by 0.09 in (2.4 mm) at the axle (half the −4.7 mm diameter difference).

305/30R24 is 0.19 in shorter than 265/45R22 and 40 mm wider, a 0.59% difference in overall diameter.

With the speedometer calibrated for 265/45R22, an indicated 60 mph is actually 59.6 mph on 305/30R24, and revolutions per mile change from 643 to 646.

305/30R24 mounts on a 24-inch wheel, a plus-2 fitment from the 22-inch wheel of 265/45R22.

Size pages

Other comparisons with 265/45R22

Other comparisons with 305/30R24

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