195/60R16 vs 265/35R18

265/35R18 is 0.09 in (2.3 mm) taller than 195/60R16, a +0.36% diameter difference. With the speedometer set for 195/60R16, an indicated 60 mph is 60.2 mph on 265/35R18.

Is this a safe swap?

Diameter difference +0.36%: under 1%

By overall diameter alone, 265/35R18 is a near match for 195/60R16; 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.

195/60R16 vs 265/35R18 differences
Measurement	195/60R16	265/35R18	Difference	% diff
Overall diameter	25.21 in (640.4 mm)	25.30 in (642.7 mm)	+0.09 in (+2.3 mm)	+0.36%
Sidewall height	4.61 in (117.0 mm)	3.65 in (92.8 mm)	−0.95 in (−24.2 mm)	−20.73%
Section width	7.68 in (195.0 mm)	10.43 in (265.0 mm)	+2.76 in (+70.0 mm)	+35.90%
Circumference	79.21 in (2,011.9 mm)	79.49 in (2,019.1 mm)	+0.28 in (+7.2 mm)	+0.36%
Revolutions per mile	800	797	−3	−0.36%

True speed with the speedometer calibrated for 195/60R16
Indicated	Actual on 195/60R16	Actual on 265/35R18	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: 265/35R18 raises the vehicle by 0.05 in (1.2 mm) at the axle (half the +2.3 mm diameter difference).

265/35R18 is 0.09 in taller than 195/60R16 and 70 mm wider, a 0.36% difference in overall diameter.

With the speedometer calibrated for 195/60R16, an indicated 60 mph is actually 60.2 mph on 265/35R18, and revolutions per mile change from 800 to 797.

265/35R18 mounts on a 18-inch wheel, a plus-2 fitment from the 16-inch wheel of 195/60R16.

Size pages

Other comparisons with 195/60R16

Other comparisons with 265/35R18

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