TireSizesFinder

285/75R16 vs 265/70R18

265/70R18 is 0.22 in (5.7 mm) shorter than 285/75R16, a −0.68% diameter difference. With the speedometer set for 285/75R16, an indicated 60 mph is 59.6 mph on 265/70R18.

Is this a safe swap?

Diameter difference −0.68%: under 1%

By overall diameter alone, 265/70R18 is a near match for 285/75R16; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 285/75R16 (32.83 in) vs 265/70R18 (32.61 in)285/75R1632.83 in × 11.22 in265/70R1832.61 in × 10.43 in
Side profile and tread width, drawn to the same scale.
285/75R16 vs 265/70R18 differences
Measurement285/75R16265/70R18Difference% diff
Overall diameter32.83 in (833.9 mm)32.61 in (828.2 mm)−0.22 in (−5.7 mm)−0.68%
Sidewall height8.42 in (213.8 mm)7.30 in (185.5 mm)−1.11 in (−28.2 mm)−13.22%
Section width11.22 in (285.0 mm)10.43 in (265.0 mm)−0.79 in (−20.0 mm)−7.02%
Circumference103.14 in (2,619.8 mm)102.44 in (2,601.9 mm)−0.71 in (−17.9 mm)−0.68%
Revolutions per mile614619+4+0.69%
True speed with the speedometer calibrated for 285/75R16
IndicatedActual on 285/75R16Actual on 265/70R18Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.5 mph−0.5 mph

Ride-height change: 265/70R18 lowers the vehicle by 0.11 in (2.8 mm) at the axle (half the −5.7 mm diameter difference).

265/70R18 is 0.22 in shorter than 285/75R16 and 20 mm narrower, a 0.68% difference in overall diameter.

With the speedometer calibrated for 285/75R16, an indicated 60 mph is actually 59.6 mph on 265/70R18, and revolutions per mile change from 614 to 619.

265/70R18 mounts on a 18-inch wheel, a plus-2 fitment from the 16-inch wheel of 285/75R16.

Size pages

Other comparisons with 285/75R16

Other comparisons with 265/70R18

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