TireSizesFinder

315/75R16 vs 295/70R18

295/70R18 is 0.34 in (8.7 mm) shorter than 315/75R16, a −0.99% diameter difference. With the speedometer set for 315/75R16, an indicated 60 mph is 59.4 mph on 295/70R18.

Is this a safe swap?

Diameter difference −0.99%: under 1%

By overall diameter alone, 295/70R18 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 295/70R18 (34.26 in)315/75R1634.60 in × 12.40 in295/70R1834.26 in × 11.61 in
Side profile and tread width, drawn to the same scale.
315/75R16 vs 295/70R18 differences
Measurement315/75R16295/70R18Difference% diff
Overall diameter34.60 in (878.9 mm)34.26 in (870.2 mm)−0.34 in (−8.7 mm)−0.99%
Sidewall height9.30 in (236.3 mm)8.13 in (206.5 mm)−1.17 in (−29.7 mm)−12.59%
Section width12.40 in (315.0 mm)11.61 in (295.0 mm)−0.79 in (−20.0 mm)−6.35%
Circumference108.71 in (2,761.1 mm)107.63 in (2,733.8 mm)−1.08 in (−27.3 mm)−0.99%
Revolutions per mile583589+6+1.00%
True speed with the speedometer calibrated for 315/75R16
IndicatedActual on 315/75R16Actual on 295/70R18Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.3 mph−0.7 mph

Ride-height change: 295/70R18 lowers the vehicle by 0.17 in (4.3 mm) at the axle (half the −8.7 mm diameter difference).

295/70R18 is 0.34 in shorter than 315/75R16 and 20 mm narrower, a 0.99% difference in overall diameter.

With the speedometer calibrated for 315/75R16, an indicated 60 mph is actually 59.4 mph on 295/70R18, and revolutions per mile change from 583 to 589.

295/70R18 mounts on a 18-inch wheel, a plus-2 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.