265/75R16 vs 235/80R17

235/80R17 is 0.15 in (3.9 mm) taller than 265/75R16, a +0.49% diameter difference. With the speedometer set for 265/75R16, an indicated 60 mph is 60.3 mph on 235/80R17.

Is this a safe swap?

Diameter difference +0.49%: under 1%

By overall diameter alone, 235/80R17 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 235/80R17 differences
Measurement	265/75R16	235/80R17	Difference	% diff
Overall diameter	31.65 in (803.9 mm)	31.80 in (807.8 mm)	+0.15 in (+3.9 mm)	+0.49%
Sidewall height	7.82 in (198.8 mm)	7.40 in (188.0 mm)	−0.42 in (−10.7 mm)	−5.41%
Section width	10.43 in (265.0 mm)	9.25 in (235.0 mm)	−1.18 in (−30.0 mm)	−11.32%
Circumference	99.43 in (2,525.5 mm)	99.91 in (2,537.8 mm)	+0.48 in (+12.3 mm)	+0.49%
Revolutions per mile	637	634	−3	−0.48%

True speed with the speedometer calibrated for 265/75R16
Indicated	Actual on 265/75R16	Actual on 235/80R17	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.3 mph	+0.3 mph
75 mph	75.0 mph	75.4 mph	+0.4 mph

Ride-height change: 235/80R17 raises the vehicle by 0.08 in (1.9 mm) at the axle (half the +3.9 mm diameter difference).

235/80R17 is 0.15 in taller than 265/75R16 and 30 mm narrower, a 0.49% difference in overall diameter.

With the speedometer calibrated for 265/75R16, an indicated 60 mph is actually 60.3 mph on 235/80R17, and revolutions per mile change from 637 to 634.

235/80R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 265/75R16.

Size pages

Other comparisons with 265/75R16

Other comparisons with 235/80R17

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