265/60R20 vs 33x12.50R20

33x12.50R20 is 0.48 in (12.2 mm) taller than 265/60R20, a +1.48% diameter difference. With the speedometer set for 265/60R20, an indicated 60 mph is 60.9 mph on 33x12.50R20.

Is this a safe swap?

Diameter difference +1.48%: within the ±3% guideline

By overall diameter alone, 33x12.50R20 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 33x12.50R20 differences
Measurement	265/60R20	33x12.50R20	Difference	% diff
Overall diameter	32.52 in (826.0 mm)	33.00 in (838.2 mm)	+0.48 in (+12.2 mm)	+1.48%
Sidewall height	6.26 in (159.0 mm)	6.50 in (165.1 mm)	+0.24 in (+6.1 mm)	+3.84%
Section width	10.43 in (265.0 mm)	12.50 in (317.5 mm)	+2.07 in (+52.5 mm)	+19.81%
Circumference	102.16 in (2,595.0 mm)	103.67 in (2,633.3 mm)	+1.51 in (+38.3 mm)	+1.48%
Revolutions per mile	620	611	−9	−1.46%

True speed with the speedometer calibrated for 265/60R20
Indicated	Actual on 265/60R20	Actual on 33x12.50R20	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.1 mph	+1.1 mph

Ride-height change: 33x12.50R20 raises the vehicle by 0.24 in (6.1 mm) at the axle (half the +12.2 mm diameter difference).

33x12.50R20 is 0.48 in taller than 265/60R20 and 53 mm wider, a 1.48% difference in overall diameter.

With the speedometer calibrated for 265/60R20, an indicated 60 mph is actually 60.9 mph on 33x12.50R20, and revolutions per mile change from 620 to 611.

Both sizes mount on 20-inch wheels.

Size pages

Other comparisons with 265/60R20

Other comparisons with 33x12.50R20

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