TireSizesFinder

315/75R16 vs 315/70R17

315/70R17 is 0.24 in (6.1 mm) shorter than 315/75R16, a −0.69% diameter difference. With the speedometer set for 315/75R16, an indicated 60 mph is 59.6 mph on 315/70R17.

Is this a safe swap?

Diameter difference −0.69%: under 1%

By overall diameter alone, 315/70R17 is a near match for 315/75R16; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 315/75R16 (34.60 in) vs 315/70R17 (34.36 in)315/75R1634.60 in × 12.40 in315/70R1734.36 in × 12.40 in
Side profile and tread width, drawn to the same scale.
315/75R16 vs 315/70R17 differences
Measurement315/75R16315/70R17Difference% diff
Overall diameter34.60 in (878.9 mm)34.36 in (872.8 mm)−0.24 in (−6.1 mm)−0.69%
Sidewall height9.30 in (236.3 mm)8.68 in (220.5 mm)−0.62 in (−15.7 mm)−6.67%
Section width12.40 in (315.0 mm)12.40 in (315.0 mm)0.00 in (0.0 mm)0.00%
Circumference108.71 in (2,761.1 mm)107.95 in (2,742.0 mm)−0.75 in (−19.2 mm)−0.69%
Revolutions per mile583587+4+0.70%
True speed with the speedometer calibrated for 315/75R16
IndicatedActual on 315/75R16Actual on 315/70R17Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.5 mph−0.5 mph

Ride-height change: 315/70R17 lowers the vehicle by 0.12 in (3.1 mm) at the axle (half the −6.1 mm diameter difference).

315/70R17 is 0.24 in shorter than 315/75R16 and the same width, a 0.69% difference in overall diameter.

With the speedometer calibrated for 315/75R16, an indicated 60 mph is actually 59.6 mph on 315/70R17, and revolutions per mile change from 583 to 587.

315/70R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 315/75R16.

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.