265/60R20 vs 285/60R20

285/60R20 is 0.94 in (24.0 mm) taller than 265/60R20, a +2.91% diameter difference. With the speedometer set for 265/60R20, an indicated 60 mph is 61.7 mph on 285/60R20.

Is this a safe swap?

Diameter difference +2.91%: within the ±3% guideline

By overall diameter alone, 285/60R20 falls inside the ±3% range commonly used as a guideline when replacing 265/60R20. 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 285/60R20 differences
Measurement	265/60R20	285/60R20	Difference	% diff
Overall diameter	32.52 in (826.0 mm)	33.46 in (850.0 mm)	+0.94 in (+24.0 mm)	+2.91%
Sidewall height	6.26 in (159.0 mm)	6.73 in (171.0 mm)	+0.47 in (+12.0 mm)	+7.55%
Section width	10.43 in (265.0 mm)	11.22 in (285.0 mm)	+0.79 in (+20.0 mm)	+7.55%
Circumference	102.16 in (2,595.0 mm)	105.13 in (2,670.4 mm)	+2.97 in (+75.4 mm)	+2.91%
Revolutions per mile	620	603	−18	−2.82%

True speed with the speedometer calibrated for 265/60R20
Indicated	Actual on 265/60R20	Actual on 285/60R20	Difference
30 mph	30.0 mph	30.9 mph	+0.9 mph
60 mph	60.0 mph	61.7 mph	+1.7 mph
75 mph	75.0 mph	77.2 mph	+2.2 mph

Ride-height change: 285/60R20 raises the vehicle by 0.47 in (12.0 mm) at the axle (half the +24.0 mm diameter difference).

285/60R20 is 0.94 in taller than 265/60R20 and 20 mm wider, a 2.91% difference in overall diameter.

With the speedometer calibrated for 265/60R20, an indicated 60 mph is actually 61.7 mph on 285/60R20, and revolutions per mile change from 620 to 603.

Both sizes mount on 20-inch wheels.

Size pages

Other comparisons with 265/60R20

Other comparisons with 285/60R20

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