Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
90/70r14 vs 100/60r14 Tire Comparison Side By Side
  90/70-14 100/60-14 Difference
Diameter inches (mm) 18.96 (481.6) 18.72 (475.6) -0.24 (-6) -1.2%
Width inches (mm) 3.54 (90) 3.94 (100) 0.39 (10) 11.1%
Circum. inches (mm) 59.57 (1512.99) 58.82 (1494.14) -0.74 (-18.85) -1.2%
Sidewall Height inches (mm) 2.48 (63) 2.36 (60) -0.12 (-3) -4.8%
Revolutions per mile (km) 1063.68 (660.94) 1077.1 (669.28) 13.42 (8.34) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.75 mph (31.79 km/h)
25 mph (40.23 km/h)24.69 mph (39.73 km/h)
30 mph (48.28 km/h)29.63 mph (47.68 km/h)
35 mph (56.33 km/h)34.56 mph (55.63 km/h)
40 mph (64.37 km/h)39.5 mph (63.57 km/h)
45 mph (72.42 km/h)44.44 mph (71.52 km/h)
50 mph (80.47 km/h)49.38 mph (79.46 km/h)
55 mph (88.51 km/h)54.31 mph (87.41 km/h)
60 mph (96.56 km/h)59.25 mph (95.36 km/h)
65 mph (104.61 km/h)64.19 mph (103.3 km/h)
70 mph (112.65 km/h)69.13 mph (111.25 km/h)
75 mph (120.7 km/h)74.07 mph (119.2 km/h)
80 mph (128.75 km/h)79 mph (127.14 km/h)
85 mph (136.79 km/h)83.94 mph (135.09 km/h)
90 mph (144.84 km/h)88.88 mph (143.04 km/h)
95 mph (152.89 km/h)93.82 mph (150.98 km/h)
100 mph (160.93 km/h)98.75 mph (158.93 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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