245/75R16 vs 245/70R17

245/70R17 is 0.04 in (0.9 mm) taller than 245/75R16, a +0.12% diameter difference. With the speedometer set for 245/75R16, an indicated 60 mph is 60.1 mph on 245/70R17.

Is this a safe swap?

Diameter difference +0.12%: under 1%

By overall diameter alone, 245/70R17 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 245/70R17 differences
Measurement	245/75R16	245/70R17	Difference	% diff
Overall diameter	30.47 in (773.9 mm)	30.50 in (774.8 mm)	+0.04 in (+0.9 mm)	+0.12%
Sidewall height	7.23 in (183.8 mm)	6.75 in (171.5 mm)	−0.48 in (−12.2 mm)	−6.67%
Section width	9.65 in (245.0 mm)	9.65 in (245.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	95.72 in (2,431.3 mm)	95.83 in (2,434.1 mm)	+0.11 in (+2.8 mm)	+0.12%
Revolutions per mile	662	661	−1	−0.12%

True speed with the speedometer calibrated for 245/75R16
Indicated	Actual on 245/75R16	Actual on 245/70R17	Difference
30 mph	30.0 mph	30.0 mph	0.0 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: 245/70R17 raises the vehicle by 0.02 in (0.4 mm) at the axle (half the +0.9 mm diameter difference).

245/70R17 is 0.04 in taller than 245/75R16 and the same width, a 0.12% difference in overall diameter.

With the speedometer calibrated for 245/75R16, an indicated 60 mph is actually 60.1 mph on 245/70R17, and revolutions per mile change from 662 to 661.

245/70R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 245/75R16.

Size pages

Other comparisons with 245/75R16

Other comparisons with 245/70R17

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