Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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100/80r10 vs 90/90r10 Tire Comparison Side By Side
  100/80-10 90/90-10 Difference
Diameter inches (mm) 16.3 (414) 16.38 (416) 0.08 (2) 0.5%
Width inches (mm) 3.94 (100) 3.54 (90) -0.39 (-10) -10%
Circum. inches (mm) 51.21 (1300.62) 51.45 (1306.9) 0.25 (6.28) 0.5%
Sidewall Height inches (mm) 3.15 (80) 3.19 (81) 0.04 (1) 1.3%
Revolutions per mile (km) 1237.37 (768.86) 1231.42 (765.17) -5.95 (-3.7) -0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.1 mph (32.34 km/h)
25 mph (40.23 km/h)25.12 mph (40.43 km/h)
30 mph (48.28 km/h)30.14 mph (48.51 km/h)
35 mph (56.33 km/h)35.17 mph (56.6 km/h)
40 mph (64.37 km/h)40.19 mph (64.68 km/h)
45 mph (72.42 km/h)45.22 mph (72.77 km/h)
50 mph (80.47 km/h)50.24 mph (80.86 km/h)
55 mph (88.51 km/h)55.27 mph (88.94 km/h)
60 mph (96.56 km/h)60.29 mph (97.03 km/h)
65 mph (104.61 km/h)65.31 mph (105.11 km/h)
70 mph (112.65 km/h)70.34 mph (113.2 km/h)
75 mph (120.7 km/h)75.36 mph (121.28 km/h)
80 mph (128.75 km/h)80.39 mph (129.37 km/h)
85 mph (136.79 km/h)85.41 mph (137.46 km/h)
90 mph (144.84 km/h)90.43 mph (145.54 km/h)
95 mph (152.89 km/h)95.46 mph (153.63 km/h)
100 mph (160.93 km/h)100.48 mph (161.71 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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