Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/70r14 vs 145/80r13 Tire Comparison Side By Side
  155/70-14 145/80-13 Difference
Diameter inches (mm) 22.54 (572.6) 22.13 (562.2) -0.41 (-10.4) -1.8%
Width inches (mm) 6.1 (155) 5.71 (145) -0.39 (-10) -6.5%
Circum. inches (mm) 70.82 (1798.88) 69.54 (1766.2) -1.29 (-32.67) -1.8%
Sidewall Height inches (mm) 4.27 (108.5) 4.57 (116) 0.3 (7.5) 6.9%
Revolutions per mile (km) 894.64 (555.9) 911.19 (566.19) 16.55 (10.28) 1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.64 mph (31.6 km/h)
25 mph (40.23 km/h)24.55 mph (39.5 km/h)
30 mph (48.28 km/h)29.46 mph (47.4 km/h)
35 mph (56.33 km/h)34.36 mph (55.3 km/h)
40 mph (64.37 km/h)39.27 mph (63.2 km/h)
45 mph (72.42 km/h)44.18 mph (71.11 km/h)
50 mph (80.47 km/h)49.09 mph (79.01 km/h)
55 mph (88.51 km/h)54 mph (86.91 km/h)
60 mph (96.56 km/h)58.91 mph (94.81 km/h)
65 mph (104.61 km/h)63.82 mph (102.71 km/h)
70 mph (112.65 km/h)68.73 mph (110.61 km/h)
75 mph (120.7 km/h)73.64 mph (118.51 km/h)
80 mph (128.75 km/h)78.55 mph (126.41 km/h)
85 mph (136.79 km/h)83.46 mph (134.31 km/h)
90 mph (144.84 km/h)88.37 mph (142.21 km/h)
95 mph (152.89 km/h)93.27 mph (150.11 km/h)
100 mph (160.93 km/h)98.18 mph (158.01 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
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