245/75R16 vs 265/60R18

265/60R18 is 0.05 in (1.3 mm) taller than 245/75R16, a +0.17% diameter difference. With the speedometer set for 245/75R16, an indicated 60 mph is 60.1 mph on 265/60R18.

Is this a safe swap?

Diameter difference +0.17%: under 1%

By overall diameter alone, 265/60R18 is a near match for 245/75R16; 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.

245/75R16 vs 265/60R18 differences
Measurement	245/75R16	265/60R18	Difference	% diff
Overall diameter	30.47 in (773.9 mm)	30.52 in (775.2 mm)	+0.05 in (+1.3 mm)	+0.17%
Sidewall height	7.23 in (183.8 mm)	6.26 in (159.0 mm)	−0.97 in (−24.7 mm)	−13.47%
Section width	9.65 in (245.0 mm)	10.43 in (265.0 mm)	+0.79 in (+20.0 mm)	+8.16%
Circumference	95.72 in (2,431.3 mm)	95.88 in (2,435.4 mm)	+0.16 in (+4.1 mm)	+0.17%
Revolutions per mile	662	661	−1	−0.17%

True speed with the speedometer calibrated for 245/75R16
Indicated	Actual on 245/75R16	Actual on 265/60R18	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.1 mph	+0.1 mph
75 mph	75.0 mph	75.1 mph	+0.1 mph

Ride-height change: 265/60R18 raises the vehicle by 0.03 in (0.7 mm) at the axle (half the +1.3 mm diameter difference).

265/60R18 is 0.05 in taller than 245/75R16 and 20 mm wider, a 0.17% difference in overall diameter.

With the speedometer calibrated for 245/75R16, an indicated 60 mph is actually 60.1 mph on 265/60R18, and revolutions per mile change from 662 to 661.

265/60R18 mounts on a 18-inch wheel, a plus-2 fitment from the 16-inch wheel of 245/75R16.

Size pages

Other comparisons with 245/75R16

Other comparisons with 265/60R18

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