295/35R24 vs 305/35R24

305/35R24 is 0.28 in (7.0 mm) taller than 295/35R24, a +0.86% diameter difference. With the speedometer set for 295/35R24, an indicated 60 mph is 60.5 mph on 305/35R24.

Is this a safe swap?

Diameter difference +0.86%: under 1%

By overall diameter alone, 305/35R24 is a near match for 295/35R24; 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.

295/35R24 vs 305/35R24 differences
Measurement	295/35R24	305/35R24	Difference	% diff
Overall diameter	32.13 in (816.1 mm)	32.41 in (823.1 mm)	+0.28 in (+7.0 mm)	+0.86%
Sidewall height	4.06 in (103.3 mm)	4.20 in (106.8 mm)	+0.14 in (+3.5 mm)	+3.39%
Section width	11.61 in (295.0 mm)	12.01 in (305.0 mm)	+0.39 in (+10.0 mm)	+3.39%
Circumference	100.94 in (2,563.9 mm)	101.80 in (2,585.8 mm)	+0.87 in (+22.0 mm)	+0.86%
Revolutions per mile	628	622	−5	−0.85%

True speed with the speedometer calibrated for 295/35R24
Indicated	Actual on 295/35R24	Actual on 305/35R24	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.5 mph	+0.5 mph
75 mph	75.0 mph	75.6 mph	+0.6 mph

Ride-height change: 305/35R24 raises the vehicle by 0.14 in (3.5 mm) at the axle (half the +7.0 mm diameter difference).

305/35R24 is 0.28 in taller than 295/35R24 and 10 mm wider, a 0.86% difference in overall diameter.

With the speedometer calibrated for 295/35R24, an indicated 60 mph is actually 60.5 mph on 305/35R24, and revolutions per mile change from 628 to 622.

Both sizes mount on 24-inch wheels.

Size pages

Other comparisons with 295/35R24

Other comparisons with 305/35R24

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