Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
90/70r10 vs 70/100r10 Tire Comparison Side By Side
  90/70-10 70/100-10 Difference
Diameter inches (mm) 14.96 (380) 15.51 (394) 0.55 (14) 3.7%
Width inches (mm) 3.54 (90) 2.76 (70) -0.79 (-20) -22.2%
Circum. inches (mm) 47 (1193.81) 48.73 (1237.79) 1.73 (43.98) 3.7%
Sidewall Height inches (mm) 2.48 (63) 2.76 (70) 0.28 (7) 11.1%
Revolutions per mile (km) 1348.08 (837.66) 1300.18 (807.89) -47.9 (-29.76) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.74 mph (33.37 km/h)
25 mph (40.23 km/h)25.92 mph (41.72 km/h)
30 mph (48.28 km/h)31.11 mph (50.06 km/h)
35 mph (56.33 km/h)36.29 mph (58.4 km/h)
40 mph (64.37 km/h)41.47 mph (66.75 km/h)
45 mph (72.42 km/h)46.66 mph (75.09 km/h)
50 mph (80.47 km/h)51.84 mph (83.43 km/h)
55 mph (88.51 km/h)57.03 mph (91.78 km/h)
60 mph (96.56 km/h)62.21 mph (100.12 km/h)
65 mph (104.61 km/h)67.39 mph (108.46 km/h)
70 mph (112.65 km/h)72.58 mph (116.8 km/h)
75 mph (120.7 km/h)77.76 mph (125.15 km/h)
80 mph (128.75 km/h)82.95 mph (133.49 km/h)
85 mph (136.79 km/h)88.13 mph (141.83 km/h)
90 mph (144.84 km/h)93.32 mph (150.18 km/h)
95 mph (152.89 km/h)98.5 mph (158.52 km/h)
100 mph (160.93 km/h)103.68 mph (166.86 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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