265/60R20 vs 295/55R20

295/55R20 is 0.26 in (6.5 mm) taller than 265/60R20, a +0.79% diameter difference. With the speedometer set for 265/60R20, an indicated 60 mph is 60.5 mph on 295/55R20.

Is this a safe swap?

Diameter difference +0.79%: under 1%

By overall diameter alone, 295/55R20 is a near match for 265/60R20; 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.

265/60R20 vs 295/55R20 differences
Measurement	265/60R20	295/55R20	Difference	% diff
Overall diameter	32.52 in (826.0 mm)	32.78 in (832.5 mm)	+0.26 in (+6.5 mm)	+0.79%
Sidewall height	6.26 in (159.0 mm)	6.39 in (162.3 mm)	+0.13 in (+3.3 mm)	+2.04%
Section width	10.43 in (265.0 mm)	11.61 in (295.0 mm)	+1.18 in (+30.0 mm)	+11.32%
Circumference	102.16 in (2,595.0 mm)	102.97 in (2,615.4 mm)	+0.80 in (+20.4 mm)	+0.79%
Revolutions per mile	620	615	−5	−0.78%

True speed with the speedometer calibrated for 265/60R20
Indicated	Actual on 265/60R20	Actual on 295/55R20	Difference
30 mph	30.0 mph	30.2 mph	+0.2 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: 295/55R20 raises the vehicle by 0.13 in (3.3 mm) at the axle (half the +6.5 mm diameter difference).

295/55R20 is 0.26 in taller than 265/60R20 and 30 mm wider, a 0.79% difference in overall diameter.

With the speedometer calibrated for 265/60R20, an indicated 60 mph is actually 60.5 mph on 295/55R20, and revolutions per mile change from 620 to 615.

Both sizes mount on 20-inch wheels.

Size pages

Other comparisons with 265/60R20

Other comparisons with 295/55R20

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