315/75R16 vs 315/75R17

315/75R17 is 1.00 in (25.4 mm) taller than 315/75R16, a +2.89% diameter difference. With the speedometer set for 315/75R16, an indicated 60 mph is 61.7 mph on 315/75R17.

Is this a safe swap?

Diameter difference +2.89%: within the ±3% guideline

By overall diameter alone, 315/75R17 falls inside the ±3% range commonly used as a guideline when replacing 315/75R16. 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.

315/75R16 vs 315/75R17 differences
Measurement	315/75R16	315/75R17	Difference	% diff
Overall diameter	34.60 in (878.9 mm)	35.60 in (904.3 mm)	+1.00 in (+25.4 mm)	+2.89%
Sidewall height	9.30 in (236.3 mm)	9.30 in (236.3 mm)	0.00 in (0.0 mm)	0.00%
Section width	12.40 in (315.0 mm)	12.40 in (315.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	108.71 in (2,761.1 mm)	111.85 in (2,840.9 mm)	+3.14 in (+79.8 mm)	+2.89%
Revolutions per mile	583	566	−16	−2.81%

True speed with the speedometer calibrated for 315/75R16
Indicated	Actual on 315/75R16	Actual on 315/75R17	Difference
30 mph	30.0 mph	30.9 mph	+0.9 mph
60 mph	60.0 mph	61.7 mph	+1.7 mph
75 mph	75.0 mph	77.2 mph	+2.2 mph

Ride-height change: 315/75R17 raises the vehicle by 0.50 in (12.7 mm) at the axle (half the +25.4 mm diameter difference).

315/75R17 is 1.00 in taller than 315/75R16 and the same width, a 2.89% difference in overall diameter.

With the speedometer calibrated for 315/75R16, an indicated 60 mph is actually 61.7 mph on 315/75R17, and revolutions per mile change from 583 to 566.

315/75R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 315/75R16.

Size pages

Other comparisons with 315/75R16

Other comparisons with 315/75R17

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