265/75R16 vs 285/60R18

285/60R18 is 0.19 in (4.7 mm) shorter than 265/75R16, a −0.58% diameter difference. With the speedometer set for 265/75R16, an indicated 60 mph is 59.6 mph on 285/60R18.

Is this a safe swap?

Diameter difference −0.58%: under 1%

By overall diameter alone, 285/60R18 is a near match for 265/75R16; 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.

265/75R16 vs 285/60R18 differences
Measurement	265/75R16	285/60R18	Difference	% diff
Overall diameter	31.65 in (803.9 mm)	31.46 in (799.2 mm)	−0.19 in (−4.7 mm)	−0.58%
Sidewall height	7.82 in (198.8 mm)	6.73 in (171.0 mm)	−1.09 in (−27.7 mm)	−13.96%
Section width	10.43 in (265.0 mm)	11.22 in (285.0 mm)	+0.79 in (+20.0 mm)	+7.55%
Circumference	99.43 in (2,525.5 mm)	98.85 in (2,510.8 mm)	−0.58 in (−14.8 mm)	−0.58%
Revolutions per mile	637	641	+4	+0.59%

True speed with the speedometer calibrated for 265/75R16
Indicated	Actual on 265/75R16	Actual on 285/60R18	Difference
30 mph	30.0 mph	29.8 mph	−0.2 mph
60 mph	60.0 mph	59.6 mph	−0.4 mph
75 mph	75.0 mph	74.6 mph	−0.4 mph

Ride-height change: 285/60R18 lowers the vehicle by 0.09 in (2.3 mm) at the axle (half the −4.7 mm diameter difference).

285/60R18 is 0.19 in shorter than 265/75R16 and 20 mm wider, a 0.58% difference in overall diameter.

With the speedometer calibrated for 265/75R16, an indicated 60 mph is actually 59.6 mph on 285/60R18, and revolutions per mile change from 637 to 641.

285/60R18 mounts on a 18-inch wheel, a plus-2 fitment from the 16-inch wheel of 265/75R16.

Size pages

Other comparisons with 265/75R16

Other comparisons with 285/60R18

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