Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/80r14 vs 135/90r14 Tire Comparison Side By Side
  135/80-14 135/90-14 Difference
Diameter inches (mm) 22.5 (571.6) 23.57 (598.6) 1.06 (27) 4.7%
Width inches (mm) 5.31 (135) 5.31 (135) 0 (0) 0%
Circum. inches (mm) 70.7 (1795.73) 74.04 (1880.56) 3.34 (84.82) 4.7%
Sidewall Height inches (mm) 4.25 (108) 4.78 (121.5) 0.53 (13.5) 12.5%
Revolutions per mile (km) 896.2 (556.87) 855.78 (531.76) -40.42 (-25.12) -4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.94 mph (33.71 km/h)
25 mph (40.23 km/h)26.18 mph (42.13 km/h)
30 mph (48.28 km/h)31.42 mph (50.56 km/h)
35 mph (56.33 km/h)36.65 mph (58.99 km/h)
40 mph (64.37 km/h)41.89 mph (67.41 km/h)
45 mph (72.42 km/h)47.13 mph (75.84 km/h)
50 mph (80.47 km/h)52.36 mph (84.27 km/h)
55 mph (88.51 km/h)57.6 mph (92.7 km/h)
60 mph (96.56 km/h)62.83 mph (101.12 km/h)
65 mph (104.61 km/h)68.07 mph (109.55 km/h)
70 mph (112.65 km/h)73.31 mph (117.98 km/h)
75 mph (120.7 km/h)78.54 mph (126.4 km/h)
80 mph (128.75 km/h)83.78 mph (134.83 km/h)
85 mph (136.79 km/h)89.02 mph (143.26 km/h)
90 mph (144.84 km/h)94.25 mph (151.68 km/h)
95 mph (152.89 km/h)99.49 mph (160.11 km/h)
100 mph (160.93 km/h)104.72 mph (168.54 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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