275/65R17 vs 285/65R17

285/65R17 is 0.51 in (13.0 mm) taller than 275/65R17, a +1.65% diameter difference. With the speedometer set for 275/65R17, an indicated 60 mph is 61.0 mph on 285/65R17.

Is this a safe swap?

Diameter difference +1.65%: within the ±3% guideline

By overall diameter alone, 285/65R17 falls inside the ±3% range commonly used as a guideline when replacing 275/65R17. 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.

275/65R17 vs 285/65R17 differences
Measurement	275/65R17	285/65R17	Difference	% diff
Overall diameter	31.07 in (789.3 mm)	31.59 in (802.3 mm)	+0.51 in (+13.0 mm)	+1.65%
Sidewall height	7.04 in (178.8 mm)	7.29 in (185.3 mm)	+0.26 in (+6.5 mm)	+3.64%
Section width	10.83 in (275.0 mm)	11.22 in (285.0 mm)	+0.39 in (+10.0 mm)	+3.64%
Circumference	97.62 in (2,479.7 mm)	99.23 in (2,520.5 mm)	+1.61 in (+40.8 mm)	+1.65%
Revolutions per mile	649	639	−11	−1.62%

True speed with the speedometer calibrated for 275/65R17
Indicated	Actual on 275/65R17	Actual on 285/65R17	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	61.0 mph	+1.0 mph
75 mph	75.0 mph	76.2 mph	+1.2 mph

Ride-height change: 285/65R17 raises the vehicle by 0.26 in (6.5 mm) at the axle (half the +13.0 mm diameter difference).

285/65R17 is 0.51 in taller than 275/65R17 and 10 mm wider, a 1.65% difference in overall diameter.

With the speedometer calibrated for 275/65R17, an indicated 60 mph is actually 61.0 mph on 285/65R17, and revolutions per mile change from 649 to 639.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 275/65R17

Other comparisons with 285/65R17

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