235/75R15 vs 245/70R16

245/70R16 is 0.63 in (15.9 mm) taller than 235/75R15, a +2.17% diameter difference. With the speedometer set for 235/75R15, an indicated 60 mph is 61.3 mph on 245/70R16.

Is this a safe swap?

Diameter difference +2.17%: within the ±3% guideline

By overall diameter alone, 245/70R16 falls inside the ±3% range commonly used as a guideline when replacing 235/75R15. 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.

235/75R15 vs 245/70R16 differences
Measurement	235/75R15	245/70R16	Difference	% diff
Overall diameter	28.88 in (733.5 mm)	29.50 in (749.4 mm)	+0.63 in (+15.9 mm)	+2.17%
Sidewall height	6.94 in (176.3 mm)	6.75 in (171.5 mm)	−0.19 in (−4.7 mm)	−2.70%
Section width	9.25 in (235.0 mm)	9.65 in (245.0 mm)	+0.39 in (+10.0 mm)	+4.26%
Circumference	90.72 in (2,304.4 mm)	92.69 in (2,354.3 mm)	+1.97 in (+50.0 mm)	+2.17%
Revolutions per mile	698	684	−15	−2.12%

True speed with the speedometer calibrated for 235/75R15
Indicated	Actual on 235/75R15	Actual on 245/70R16	Difference
30 mph	30.0 mph	30.7 mph	+0.7 mph
60 mph	60.0 mph	61.3 mph	+1.3 mph
75 mph	75.0 mph	76.6 mph	+1.6 mph

Ride-height change: 245/70R16 raises the vehicle by 0.31 in (7.9 mm) at the axle (half the +15.9 mm diameter difference).

245/70R16 is 0.63 in taller than 235/75R15 and 10 mm wider, a 2.17% difference in overall diameter.

With the speedometer calibrated for 235/75R15, an indicated 60 mph is actually 61.3 mph on 245/70R16, and revolutions per mile change from 698 to 684.

245/70R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 235/75R15.

Size pages

Other comparisons with 235/75R15

Other comparisons with 245/70R16

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