TireSizesFinder

295/70R18 vs 295/60R20

295/60R20 is 0.32 in (8.2 mm) shorter than 295/70R18, a −0.94% diameter difference. With the speedometer set for 295/70R18, an indicated 60 mph is 59.4 mph on 295/60R20.

Is this a safe swap?

Diameter difference −0.94%: under 1%

By overall diameter alone, 295/60R20 is a near match for 295/70R18; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 295/70R18 (34.26 in) vs 295/60R20 (33.94 in)295/70R1834.26 in × 11.61 in295/60R2033.94 in × 11.61 in
Side profile and tread width, drawn to the same scale.
295/70R18 vs 295/60R20 differences
Measurement295/70R18295/60R20Difference% diff
Overall diameter34.26 in (870.2 mm)33.94 in (862.0 mm)−0.32 in (−8.2 mm)−0.94%
Sidewall height8.13 in (206.5 mm)6.97 in (177.0 mm)−1.16 in (−29.5 mm)−14.29%
Section width11.61 in (295.0 mm)11.61 in (295.0 mm)0.00 in (0.0 mm)0.00%
Circumference107.63 in (2,733.8 mm)106.62 in (2,708.1 mm)−1.01 in (−25.8 mm)−0.94%
Revolutions per mile589594+6+0.95%
True speed with the speedometer calibrated for 295/70R18
IndicatedActual on 295/70R18Actual on 295/60R20Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.3 mph−0.7 mph

Ride-height change: 295/60R20 lowers the vehicle by 0.16 in (4.1 mm) at the axle (half the −8.2 mm diameter difference).

295/60R20 is 0.32 in shorter than 295/70R18 and the same width, a 0.94% difference in overall diameter.

With the speedometer calibrated for 295/70R18, an indicated 60 mph is actually 59.4 mph on 295/60R20, and revolutions per mile change from 589 to 594.

295/60R20 mounts on a 20-inch wheel, a plus-2 fitment from the 18-inch wheel of 295/70R18.

Size pages

Other comparisons with 295/70R18

Other comparisons with 295/60R20

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