Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
140/80r15 vs 135/80r15 Tire Comparison Side By Side
  140/80-15 135/80-15 Difference
Diameter inches (mm) 23.82 (605) 23.5 (597) -0.31 (-8) -1.3%
Width inches (mm) 5.51 (140) 5.31 (135) -0.2 (-5) -3.6%
Circum. inches (mm) 74.83 (1900.66) 73.84 (1875.53) -0.99 (-25.13) -1.3%
Sidewall Height inches (mm) 4.41 (112) 4.25 (108) -0.16 (-4) -3.6%
Revolutions per mile (km) 846.73 (526.13) 858.07 (533.18) 11.35 (7.05) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.74 mph (31.76 km/h)
25 mph (40.23 km/h)24.67 mph (39.7 km/h)
30 mph (48.28 km/h)29.6 mph (47.64 km/h)
35 mph (56.33 km/h)34.54 mph (55.58 km/h)
40 mph (64.37 km/h)39.47 mph (63.52 km/h)
45 mph (72.42 km/h)44.4 mph (71.46 km/h)
50 mph (80.47 km/h)49.34 mph (79.4 km/h)
55 mph (88.51 km/h)54.27 mph (87.34 km/h)
60 mph (96.56 km/h)59.21 mph (95.28 km/h)
65 mph (104.61 km/h)64.14 mph (103.22 km/h)
70 mph (112.65 km/h)69.07 mph (111.16 km/h)
75 mph (120.7 km/h)74.01 mph (119.1 km/h)
80 mph (128.75 km/h)78.94 mph (127.05 km/h)
85 mph (136.79 km/h)83.88 mph (134.99 km/h)
90 mph (144.84 km/h)88.81 mph (142.93 km/h)
95 mph (152.89 km/h)93.74 mph (150.87 km/h)
100 mph (160.93 km/h)98.68 mph (158.81 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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