245/75R17 vs 285/65R17

285/65R17 is 0.12 in (3.0 mm) taller than 245/75R17, a +0.38% diameter difference. With the speedometer set for 245/75R17, an indicated 60 mph is 60.2 mph on 285/65R17.

Is this a safe swap?

Diameter difference +0.38%: under 1%

By overall diameter alone, 285/65R17 is a near match for 245/75R17; 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.

245/75R17 vs 285/65R17 differences
Measurement	245/75R17	285/65R17	Difference	% diff
Overall diameter	31.47 in (799.3 mm)	31.59 in (802.3 mm)	+0.12 in (+3.0 mm)	+0.38%
Sidewall height	7.23 in (183.8 mm)	7.29 in (185.3 mm)	+0.06 in (+1.5 mm)	+0.82%
Section width	9.65 in (245.0 mm)	11.22 in (285.0 mm)	+1.57 in (+40.0 mm)	+16.33%
Circumference	98.86 in (2,511.1 mm)	99.23 in (2,520.5 mm)	+0.37 in (+9.4 mm)	+0.38%
Revolutions per mile	641	639	−2	−0.37%

True speed with the speedometer calibrated for 245/75R17
Indicated	Actual on 245/75R17	Actual on 285/65R17	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.2 mph	+0.2 mph
75 mph	75.0 mph	75.3 mph	+0.3 mph

Ride-height change: 285/65R17 raises the vehicle by 0.06 in (1.5 mm) at the axle (half the +3.0 mm diameter difference).

285/65R17 is 0.12 in taller than 245/75R17 and 40 mm wider, a 0.38% difference in overall diameter.

With the speedometer calibrated for 245/75R17, an indicated 60 mph is actually 60.2 mph on 285/65R17, and revolutions per mile change from 641 to 639.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 245/75R17

Other comparisons with 285/65R17

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