TireSizesFinder

295/55R20 vs 285/60R20

285/60R20 is 0.69 in (17.5 mm) taller than 295/55R20, a +2.10% diameter difference. With the speedometer set for 295/55R20, an indicated 60 mph is 61.3 mph on 285/60R20.

Is this a safe swap?

Diameter difference +2.10%: within the ±3% guideline

By overall diameter alone, 285/60R20 falls inside the ±3% range commonly used as a guideline when replacing 295/55R20. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 295/55R20 (32.78 in) vs 285/60R20 (33.46 in)295/55R2032.78 in × 11.61 in285/60R2033.46 in × 11.22 in
Side profile and tread width, drawn to the same scale.
295/55R20 vs 285/60R20 differences
Measurement295/55R20285/60R20Difference% diff
Overall diameter32.78 in (832.5 mm)33.46 in (850.0 mm)+0.69 in (+17.5 mm)+2.10%
Sidewall height6.39 in (162.3 mm)6.73 in (171.0 mm)+0.34 in (+8.8 mm)+5.39%
Section width11.61 in (295.0 mm)11.22 in (285.0 mm)−0.39 in (−10.0 mm)−3.39%
Circumference102.97 in (2,615.4 mm)105.13 in (2,670.4 mm)+2.16 in (+55.0 mm)+2.10%
Revolutions per mile615603−13−2.06%
True speed with the speedometer calibrated for 295/55R20
IndicatedActual on 295/55R20Actual on 285/60R20Difference
30 mph30.0 mph30.6 mph+0.6 mph
60 mph60.0 mph61.3 mph+1.3 mph
75 mph75.0 mph76.6 mph+1.6 mph

Ride-height change: 285/60R20 raises the vehicle by 0.34 in (8.8 mm) at the axle (half the +17.5 mm diameter difference).

285/60R20 is 0.69 in taller than 295/55R20 and 10 mm narrower, a 2.10% difference in overall diameter.

With the speedometer calibrated for 295/55R20, an indicated 60 mph is actually 61.3 mph on 285/60R20, and revolutions per mile change from 615 to 603.

Both sizes mount on 20-inch wheels.

Size pages

Other comparisons with 295/55R20

Other comparisons with 285/60R20

Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.