Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
100/90r10 vs 100/80r10 Tire Comparison Side By Side
  100/90-10 100/80-10 Difference
Diameter inches (mm) 17.09 (434) 16.3 (414) -0.79 (-20) -4.6%
Width inches (mm) 3.94 (100) 3.94 (100) 0 (0) 0%
Circum. inches (mm) 53.68 (1363.45) 51.21 (1300.62) -2.47 (-62.83) -4.6%
Sidewall Height inches (mm) 3.54 (90) 3.15 (80) -0.39 (-10) -11.1%
Revolutions per mile (km) 1180.35 (733.43) 1237.37 (768.86) 57.02 (35.43) 4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.08 mph (30.7 km/h)
25 mph (40.23 km/h)23.85 mph (38.38 km/h)
30 mph (48.28 km/h)28.62 mph (46.06 km/h)
35 mph (56.33 km/h)33.39 mph (53.73 km/h)
40 mph (64.37 km/h)38.16 mph (61.41 km/h)
45 mph (72.42 km/h)42.93 mph (69.08 km/h)
50 mph (80.47 km/h)47.7 mph (76.76 km/h)
55 mph (88.51 km/h)52.47 mph (84.44 km/h)
60 mph (96.56 km/h)57.24 mph (92.11 km/h)
65 mph (104.61 km/h)62 mph (99.79 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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