TireSizesFinder

35x12.50R20 vs 35x13.50R20

35x13.50R20 is 0.00 in (0.0 mm) taller than 35x12.50R20, a 0.00% diameter difference. With the speedometer set for 35x12.50R20, an indicated 60 mph is 60.0 mph on 35x13.50R20.

Is this a safe swap?

Diameter difference 0.00%: under 1%

By overall diameter alone, 35x13.50R20 is a near match for 35x12.50R20; 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: 35x12.50R20 (35.00 in) vs 35x13.50R20 (35.00 in)35x12.50R2035.00 in × 12.50 in35x13.50R2035.00 in × 13.50 in
Side profile and tread width, drawn to the same scale.
35x12.50R20 vs 35x13.50R20 differences
Measurement35x12.50R2035x13.50R20Difference% diff
Overall diameter35.00 in (889.0 mm)35.00 in (889.0 mm)0.00 in (0.0 mm)0.00%
Sidewall height7.50 in (190.5 mm)7.50 in (190.5 mm)0.00 in (0.0 mm)0.00%
Section width12.50 in (317.5 mm)13.50 in (342.9 mm)+1.00 in (+25.4 mm)+8.00%
Circumference109.96 in (2,792.9 mm)109.96 in (2,792.9 mm)0.00 in (0.0 mm)0.00%
Revolutions per mile57657600.00%
True speed with the speedometer calibrated for 35x12.50R20
IndicatedActual on 35x12.50R20Actual on 35x13.50R20Difference
30 mph30.0 mph30.0 mph0.0 mph
60 mph60.0 mph60.0 mph0.0 mph
75 mph75.0 mph75.0 mph0.0 mph

Ride-height change: 35x13.50R20 does not change the vehicle at the axle (half the 0.0 mm diameter difference).

35x13.50R20 is the same height as 35x12.50R20 and 25 mm wider, a 0.00% difference in overall diameter.

With the speedometer calibrated for 35x12.50R20, an indicated 60 mph is actually 60.0 mph on 35x13.50R20, and revolutions per mile change from 576 to 576.

Both sizes mount on 20-inch wheels.

Size pages

Other comparisons with 35x12.50R20

Other comparisons with 35x13.50R20

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