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 70/75r10 Tire Comparison Side By Side
  90/70-10 70/75-10 Difference
Diameter inches (mm) 14.96 (380) 14.13 (359) -0.83 (-21) -5.5%
Width inches (mm) 3.54 (90) 2.76 (70) -0.79 (-20) -22.2%
Circum. inches (mm) 47 (1193.81) 44.4 (1127.83) -2.6 (-65.97) -5.5%
Sidewall Height inches (mm) 2.48 (63) 2.07 (52.5) -0.41 (-10.5) -16.7%
Revolutions per mile (km) 1348.08 (837.66) 1426.94 (886.66) 78.86 (49) 5.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.89 mph (30.41 km/h)
25 mph (40.23 km/h)23.62 mph (38.01 km/h)
30 mph (48.28 km/h)28.34 mph (45.61 km/h)
35 mph (56.33 km/h)33.07 mph (53.21 km/h)
40 mph (64.37 km/h)37.79 mph (60.82 km/h)
45 mph (72.42 km/h)42.51 mph (68.42 km/h)
50 mph (80.47 km/h)47.24 mph (76.02 km/h)
55 mph (88.51 km/h)51.96 mph (83.62 km/h)
60 mph (96.56 km/h)56.68 mph (91.22 km/h)
65 mph (104.61 km/h)61.41 mph (98.83 km/h)
70 mph (112.65 km/h)66.13 mph (106.43 km/h)
75 mph (120.7 km/h)70.86 mph (114.03 km/h)
80 mph (128.75 km/h)75.58 mph (121.63 km/h)
85 mph (136.79 km/h)80.3 mph (129.23 km/h)
90 mph (144.84 km/h)85.03 mph (136.84 km/h)
95 mph (152.89 km/h)89.75 mph (144.44 km/h)
100 mph (160.93 km/h)94.47 mph (152.04 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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