TireSizesFinder

315/75R17 vs 37x13.50R17

37x13.50R17 is 1.40 in (35.5 mm) taller than 315/75R17, a +3.93% diameter difference. With the speedometer set for 315/75R17, an indicated 60 mph is 62.4 mph on 37x13.50R17.

Is this a safe swap?

Diameter difference +3.93%: outside the ±3% guideline

By overall diameter alone, 37x13.50R17 falls outside the ±3% range commonly used as a guideline when replacing 315/75R17; speedometer and ride-height changes are larger. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 315/75R17 (35.60 in) vs 37x13.50R17 (37.00 in)315/75R1735.60 in × 12.40 in37x13.50R1737.00 in × 13.50 in
Side profile and tread width, drawn to the same scale.
315/75R17 vs 37x13.50R17 differences
Measurement315/75R1737x13.50R17Difference% diff
Overall diameter35.60 in (904.3 mm)37.00 in (939.8 mm)+1.40 in (+35.5 mm)+3.93%
Sidewall height9.30 in (236.3 mm)10.00 in (254.0 mm)+0.70 in (+17.8 mm)+7.51%
Section width12.40 in (315.0 mm)13.50 in (342.9 mm)+1.10 in (+27.9 mm)+8.86%
Circumference111.85 in (2,840.9 mm)116.24 in (2,952.5 mm)+4.39 in (+111.5 mm)+3.93%
Revolutions per mile566545−21−3.78%
True speed with the speedometer calibrated for 315/75R17
IndicatedActual on 315/75R17Actual on 37x13.50R17Difference
30 mph30.0 mph31.2 mph+1.2 mph
60 mph60.0 mph62.4 mph+2.4 mph
75 mph75.0 mph77.9 mph+2.9 mph

Ride-height change: 37x13.50R17 raises the vehicle by 0.70 in (17.8 mm) at the axle (half the +35.5 mm diameter difference).

37x13.50R17 is 1.40 in taller than 315/75R17 and 28 mm wider, a 3.93% difference in overall diameter.

With the speedometer calibrated for 315/75R17, an indicated 60 mph is actually 62.4 mph on 37x13.50R17, and revolutions per mile change from 566 to 545.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 315/75R17

Other comparisons with 37x13.50R17

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