33x12.50R15 vs 285/75R16

285/75R16 is 0.17 in (4.3 mm) shorter than 33x12.50R15, a −0.51% diameter difference. With the speedometer set for 33x12.50R15, an indicated 60 mph is 59.7 mph on 285/75R16.

Is this a safe swap?

Diameter difference −0.51%: under 1%

By overall diameter alone, 285/75R16 is a near match for 33x12.50R15; the speedometer changes by less than 1%. 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.

33x12.50R15 vs 285/75R16 differences
Measurement	33x12.50R15	285/75R16	Difference	% diff
Overall diameter	33.00 in (838.2 mm)	32.83 in (833.9 mm)	−0.17 in (−4.3 mm)	−0.51%
Sidewall height	9.00 in (228.6 mm)	8.42 in (213.8 mm)	−0.58 in (−14.8 mm)	−6.50%
Section width	12.50 in (317.5 mm)	11.22 in (285.0 mm)	−1.28 in (−32.5 mm)	−10.24%
Circumference	103.67 in (2,633.3 mm)	103.14 in (2,619.8 mm)	−0.53 in (−13.5 mm)	−0.51%
Revolutions per mile	611	614	+3	+0.52%

True speed with the speedometer calibrated for 33x12.50R15
Indicated	Actual on 33x12.50R15	Actual on 285/75R16	Difference
30 mph	30.0 mph	29.8 mph	−0.2 mph
60 mph	60.0 mph	59.7 mph	−0.3 mph
75 mph	75.0 mph	74.6 mph	−0.4 mph

Ride-height change: 285/75R16 lowers the vehicle by 0.08 in (2.2 mm) at the axle (half the −4.3 mm diameter difference).

285/75R16 is 0.17 in shorter than 33x12.50R15 and 33 mm narrower, a 0.51% difference in overall diameter.

With the speedometer calibrated for 33x12.50R15, an indicated 60 mph is actually 59.7 mph on 285/75R16, and revolutions per mile change from 611 to 614.

285/75R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 33x12.50R15.

Size pages

Other comparisons with 33x12.50R15

Other comparisons with 285/75R16

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