Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
35/12.5r15 vs 35/12.5r20 Tire Comparison Side By Side
  35/12.5-15 35/12.5-20 Difference
Diameter inches (mm) 35.03 (889.8) 35.02 (889.6) -0.01 (-0.2) -0%
Width inches (mm) 12.52 (318) 12.52 (318) 0 (0) 0%
Circum. inches (mm) 110.05 (2795.39) 110.03 (2794.76) -0.02 (-0.63) -0%
Sidewall Height inches (mm) 10.02 (254.4) 7.51 (190.8) -2.5 (-63.6) -25%
Revolutions per mile (km) 575.71 (357.73) 575.84 (357.81) 0.13 (0.08) 0%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20 mph (32.18 km/h)
25 mph (40.23 km/h)24.99 mph (40.22 km/h)
30 mph (48.28 km/h)29.99 mph (48.27 km/h)
35 mph (56.33 km/h)34.99 mph (56.31 km/h)
40 mph (64.37 km/h)39.99 mph (64.36 km/h)
45 mph (72.42 km/h)44.99 mph (72.4 km/h)
50 mph (80.47 km/h)49.99 mph (80.45 km/h)
55 mph (88.51 km/h)54.99 mph (88.49 km/h)
60 mph (96.56 km/h)59.99 mph (96.54 km/h)
65 mph (104.61 km/h)64.99 mph (104.58 km/h)
70 mph (112.65 km/h)69.98 mph (112.63 km/h)
75 mph (120.7 km/h)74.98 mph (120.67 km/h)
80 mph (128.75 km/h)79.98 mph (128.72 km/h)
85 mph (136.79 km/h)84.98 mph (136.76 km/h)
90 mph (144.84 km/h)89.98 mph (144.81 km/h)
95 mph (152.89 km/h)94.98 mph (152.85 km/h)
100 mph (160.93 km/h)99.98 mph (160.9 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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