TireSizesFinder

35x12.50R17 vs 315/75R17

315/75R17 is 0.60 in (15.3 mm) taller than 35x12.50R17, a +1.72% diameter difference. With the speedometer set for 35x12.50R17, an indicated 60 mph is 61.0 mph on 315/75R17.

Is this a safe swap?

Diameter difference +1.72%: within the ±3% guideline

By overall diameter alone, 315/75R17 falls inside the ±3% range commonly used as a guideline when replacing 35x12.50R17. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 35x12.50R17 (35.00 in) vs 315/75R17 (35.60 in)35x12.50R1735.00 in × 12.50 in315/75R1735.60 in × 12.40 in
Side profile and tread width, drawn to the same scale.
35x12.50R17 vs 315/75R17 differences
Measurement35x12.50R17315/75R17Difference% diff
Overall diameter35.00 in (889.0 mm)35.60 in (904.3 mm)+0.60 in (+15.3 mm)+1.72%
Sidewall height9.00 in (228.6 mm)9.30 in (236.3 mm)+0.30 in (+7.7 mm)+3.35%
Section width12.50 in (317.5 mm)12.40 in (315.0 mm)−0.10 in (−2.5 mm)−0.79%
Circumference109.96 in (2,792.9 mm)111.85 in (2,840.9 mm)+1.89 in (+48.1 mm)+1.72%
Revolutions per mile576566−10−1.69%
True speed with the speedometer calibrated for 35x12.50R17
IndicatedActual on 35x12.50R17Actual on 315/75R17Difference
30 mph30.0 mph30.5 mph+0.5 mph
60 mph60.0 mph61.0 mph+1.0 mph
75 mph75.0 mph76.3 mph+1.3 mph

Ride-height change: 315/75R17 raises the vehicle by 0.30 in (7.6 mm) at the axle (half the +15.3 mm diameter difference).

315/75R17 is 0.60 in taller than 35x12.50R17 and 3 mm narrower, a 1.72% difference in overall diameter.

With the speedometer calibrated for 35x12.50R17, an indicated 60 mph is actually 61.0 mph on 315/75R17, and revolutions per mile change from 576 to 566.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 35x12.50R17

Other comparisons with 315/75R17

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