TireSizesFinder

33x12.50R17 vs 285/75R17

285/75R17 is 0.83 in (21.1 mm) taller than 33x12.50R17, a +2.52% diameter difference. With the speedometer set for 33x12.50R17, an indicated 60 mph is 61.5 mph on 285/75R17.

Is this a safe swap?

Diameter difference +2.52%: within the ±3% guideline

By overall diameter alone, 285/75R17 falls inside the ±3% range commonly used as a guideline when replacing 33x12.50R17. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 33x12.50R17 (33.00 in) vs 285/75R17 (33.83 in)33x12.50R1733.00 in × 12.50 in285/75R1733.83 in × 11.22 in
Side profile and tread width, drawn to the same scale.
33x12.50R17 vs 285/75R17 differences
Measurement33x12.50R17285/75R17Difference% diff
Overall diameter33.00 in (838.2 mm)33.83 in (859.3 mm)+0.83 in (+21.1 mm)+2.52%
Sidewall height8.00 in (203.2 mm)8.42 in (213.8 mm)+0.42 in (+10.6 mm)+5.19%
Section width12.50 in (317.5 mm)11.22 in (285.0 mm)−1.28 in (−32.5 mm)−10.24%
Circumference103.67 in (2,633.3 mm)106.28 in (2,699.6 mm)+2.61 in (+66.3 mm)+2.52%
Revolutions per mile611596−15−2.46%
True speed with the speedometer calibrated for 33x12.50R17
IndicatedActual on 33x12.50R17Actual on 285/75R17Difference
30 mph30.0 mph30.8 mph+0.8 mph
60 mph60.0 mph61.5 mph+1.5 mph
75 mph75.0 mph76.9 mph+1.9 mph

Ride-height change: 285/75R17 raises the vehicle by 0.42 in (10.6 mm) at the axle (half the +21.1 mm diameter difference).

285/75R17 is 0.83 in taller than 33x12.50R17 and 33 mm narrower, a 2.52% difference in overall diameter.

With the speedometer calibrated for 33x12.50R17, an indicated 60 mph is actually 61.5 mph on 285/75R17, and revolutions per mile change from 611 to 596.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 33x12.50R17

Other comparisons with 285/75R17

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