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 70/55r10 Tire Comparison Side By Side
  90/70-10 70/55-10 Difference
Diameter inches (mm) 14.96 (380) 13.03 (331) -1.93 (-49) -12.9%
Width inches (mm) 3.54 (90) 2.76 (70) -0.79 (-20) -22.2%
Circum. inches (mm) 47 (1193.81) 40.94 (1039.87) -6.06 (-153.94) -12.9%
Sidewall Height inches (mm) 2.48 (63) 1.52 (38.5) -0.96 (-24.5) -38.9%
Revolutions per mile (km) 1348.08 (837.66) 1547.64 (961.66) 199.56 (124) 14.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.42 mph (28.04 km/h)
25 mph (40.23 km/h)21.78 mph (35.05 km/h)
30 mph (48.28 km/h)26.13 mph (42.05 km/h)
35 mph (56.33 km/h)30.49 mph (49.06 km/h)
40 mph (64.37 km/h)34.84 mph (56.07 km/h)
45 mph (72.42 km/h)39.2 mph (63.08 km/h)
50 mph (80.47 km/h)43.55 mph (70.09 km/h)
55 mph (88.51 km/h)47.91 mph (77.1 km/h)
60 mph (96.56 km/h)52.26 mph (84.11 km/h)
65 mph (104.61 km/h)56.62 mph (91.12 km/h)
70 mph (112.65 km/h)60.97 mph (98.13 km/h)
75 mph (120.7 km/h)65.33 mph (105.14 km/h)
80 mph (128.75 km/h)69.68 mph (112.15 km/h)
85 mph (136.79 km/h)74.04 mph (119.16 km/h)
90 mph (144.84 km/h)78.39 mph (126.16 km/h)
95 mph (152.89 km/h)82.75 mph (133.17 km/h)
100 mph (160.93 km/h)87.11 mph (140.18 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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