275/55R20 vs 295/55R20

295/55R20 is 0.87 in (22.0 mm) taller than 275/55R20, a +2.71% diameter difference. With the speedometer set for 275/55R20, an indicated 60 mph is 61.6 mph on 295/55R20.

Is this a safe swap?

Diameter difference +2.71%: within the ±3% guideline

By overall diameter alone, 295/55R20 falls inside the ±3% range commonly used as a guideline when replacing 275/55R20. 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.

275/55R20 vs 295/55R20 differences
Measurement	275/55R20	295/55R20	Difference	% diff
Overall diameter	31.91 in (810.5 mm)	32.78 in (832.5 mm)	+0.87 in (+22.0 mm)	+2.71%
Sidewall height	5.95 in (151.3 mm)	6.39 in (162.3 mm)	+0.43 in (+11.0 mm)	+7.27%
Section width	10.83 in (275.0 mm)	11.61 in (295.0 mm)	+0.79 in (+20.0 mm)	+7.27%
Circumference	100.25 in (2,546.3 mm)	102.97 in (2,615.4 mm)	+2.72 in (+69.1 mm)	+2.71%
Revolutions per mile	632	615	−17	−2.64%

True speed with the speedometer calibrated for 275/55R20
Indicated	Actual on 275/55R20	Actual on 295/55R20	Difference
30 mph	30.0 mph	30.8 mph	+0.8 mph
60 mph	60.0 mph	61.6 mph	+1.6 mph
75 mph	75.0 mph	77.0 mph	+2.0 mph

Ride-height change: 295/55R20 raises the vehicle by 0.43 in (11.0 mm) at the axle (half the +22.0 mm diameter difference).

295/55R20 is 0.87 in taller than 275/55R20 and 20 mm wider, a 2.71% difference in overall diameter.

With the speedometer calibrated for 275/55R20, an indicated 60 mph is actually 61.6 mph on 295/55R20, and revolutions per mile change from 632 to 615.

Both sizes mount on 20-inch wheels.

Size pages

Other comparisons with 275/55R20

Other comparisons with 295/55R20

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