Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
100/80r10 vs 100/90r10 Tire Comparison Side By Side
  100/80-10 100/90-10 Difference
Diameter inches (mm) 16.3 (414) 17.09 (434) 0.79 (20) 4.8%
Width inches (mm) 3.94 (100) 3.94 (100) 0 (0) 0%
Circum. inches (mm) 51.21 (1300.62) 53.68 (1363.45) 2.47 (62.83) 4.8%
Sidewall Height inches (mm) 3.15 (80) 3.54 (90) 0.39 (10) 12.5%
Revolutions per mile (km) 1237.37 (768.86) 1180.35 (733.43) -57.02 (-35.43) -4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.97 mph (33.74 km/h)
25 mph (40.23 km/h)26.21 mph (42.18 km/h)
30 mph (48.28 km/h)31.45 mph (50.61 km/h)
35 mph (56.33 km/h)36.69 mph (59.05 km/h)
40 mph (64.37 km/h)41.93 mph (67.48 km/h)
45 mph (72.42 km/h)47.17 mph (75.92 km/h)
50 mph (80.47 km/h)52.42 mph (84.35 km/h)
55 mph (88.51 km/h)57.66 mph (92.79 km/h)
60 mph (96.56 km/h)62.9 mph (101.23 km/h)
65 mph (104.61 km/h)68.14 mph (109.66 km/h)
70 mph (112.65 km/h)73.38 mph (118.1 km/h)
75 mph (120.7 km/h)78.62 mph (126.53 km/h)
80 mph (128.75 km/h)83.86 mph (134.97 km/h)
85 mph (136.79 km/h)89.11 mph (143.4 km/h)
90 mph (144.84 km/h)94.35 mph (151.84 km/h)
95 mph (152.89 km/h)99.59 mph (160.27 km/h)
100 mph (160.93 km/h)104.83 mph (168.71 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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