TireSizesFinder

33x12.50R18 vs 295/60R20

295/60R20 is 0.94 in (23.8 mm) taller than 33x12.50R18, a +2.84% diameter difference. With the speedometer set for 33x12.50R18, an indicated 60 mph is 61.7 mph on 295/60R20.

Is this a safe swap?

Diameter difference +2.84%: within the ±3% guideline

By overall diameter alone, 295/60R20 falls inside the ±3% range commonly used as a guideline when replacing 33x12.50R18. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 33x12.50R18 (33.00 in) vs 295/60R20 (33.94 in)33x12.50R1833.00 in × 12.50 in295/60R2033.94 in × 11.61 in
Side profile and tread width, drawn to the same scale.
33x12.50R18 vs 295/60R20 differences
Measurement33x12.50R18295/60R20Difference% diff
Overall diameter33.00 in (838.2 mm)33.94 in (862.0 mm)+0.94 in (+23.8 mm)+2.84%
Sidewall height7.50 in (190.5 mm)6.97 in (177.0 mm)−0.53 in (−13.5 mm)−7.09%
Section width12.50 in (317.5 mm)11.61 in (295.0 mm)−0.89 in (−22.5 mm)−7.09%
Circumference103.67 in (2,633.3 mm)106.62 in (2,708.1 mm)+2.94 in (+74.8 mm)+2.84%
Revolutions per mile611594−17−2.76%
True speed with the speedometer calibrated for 33x12.50R18
IndicatedActual on 33x12.50R18Actual on 295/60R20Difference
30 mph30.0 mph30.9 mph+0.9 mph
60 mph60.0 mph61.7 mph+1.7 mph
75 mph75.0 mph77.1 mph+2.1 mph

Ride-height change: 295/60R20 raises the vehicle by 0.47 in (11.9 mm) at the axle (half the +23.8 mm diameter difference).

295/60R20 is 0.94 in taller than 33x12.50R18 and 23 mm narrower, a 2.84% difference in overall diameter.

With the speedometer calibrated for 33x12.50R18, an indicated 60 mph is actually 61.7 mph on 295/60R20, and revolutions per mile change from 611 to 594.

295/60R20 mounts on a 20-inch wheel, a plus-2 fitment from the 18-inch wheel of 33x12.50R18.

Size pages

Other comparisons with 33x12.50R18

Other comparisons with 295/60R20

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