245/70R16 vs 235/70R17

235/70R17 is 0.45 in (11.4 mm) taller than 245/70R16, a +1.52% diameter difference. With the speedometer set for 245/70R16, an indicated 60 mph is 60.9 mph on 235/70R17.

Is this a safe swap?

Diameter difference +1.52%: within the ±3% guideline

By overall diameter alone, 235/70R17 falls inside the ±3% range commonly used as a guideline when replacing 245/70R16. 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.

245/70R16 vs 235/70R17 differences
Measurement	245/70R16	235/70R17	Difference	% diff
Overall diameter	29.50 in (749.4 mm)	29.95 in (760.8 mm)	+0.45 in (+11.4 mm)	+1.52%
Sidewall height	6.75 in (171.5 mm)	6.48 in (164.5 mm)	−0.28 in (−7.0 mm)	−4.08%
Section width	9.65 in (245.0 mm)	9.25 in (235.0 mm)	−0.39 in (−10.0 mm)	−4.08%
Circumference	92.69 in (2,354.3 mm)	94.10 in (2,390.1 mm)	+1.41 in (+35.8 mm)	+1.52%
Revolutions per mile	684	673	−10	−1.50%

True speed with the speedometer calibrated for 245/70R16
Indicated	Actual on 245/70R16	Actual on 235/70R17	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.1 mph	+1.1 mph

Ride-height change: 235/70R17 raises the vehicle by 0.22 in (5.7 mm) at the axle (half the +11.4 mm diameter difference).

235/70R17 is 0.45 in taller than 245/70R16 and 10 mm narrower, a 1.52% difference in overall diameter.

With the speedometer calibrated for 245/70R16, an indicated 60 mph is actually 60.9 mph on 235/70R17, and revolutions per mile change from 684 to 673.

235/70R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 245/70R16.

Size pages

Other comparisons with 245/70R16

Other comparisons with 235/70R17

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