Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/60r15 vs 175/60r15 Tire Comparison Side By Side
  185/60-15 175/60-15 Difference
Diameter inches (mm) 23.74 (603) 23.27 (591) -0.47 (-12) -2%
Width inches (mm) 7.28 (185) 6.89 (175) -0.39 (-10) -5.4%
Circum. inches (mm) 74.58 (1894.38) 73.1 (1856.68) -1.48 (-37.7) -2%
Sidewall Height inches (mm) 4.37 (111) 4.13 (105) -0.24 (-6) -5.4%
Revolutions per mile (km) 849.54 (527.88) 866.79 (538.59) 17.25 (10.72) 2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.6 mph (31.55 km/h)
25 mph (40.23 km/h)24.5 mph (39.43 km/h)
30 mph (48.28 km/h)29.4 mph (47.32 km/h)
35 mph (56.33 km/h)34.3 mph (55.21 km/h)
40 mph (64.37 km/h)39.2 mph (63.09 km/h)
45 mph (72.42 km/h)44.1 mph (70.98 km/h)
50 mph (80.47 km/h)49 mph (78.87 km/h)
55 mph (88.51 km/h)53.91 mph (86.75 km/h)
60 mph (96.56 km/h)58.81 mph (94.64 km/h)
65 mph (104.61 km/h)63.71 mph (102.53 km/h)
70 mph (112.65 km/h)68.61 mph (110.41 km/h)
75 mph (120.7 km/h)73.51 mph (118.3 km/h)
80 mph (128.75 km/h)78.41 mph (126.19 km/h)
85 mph (136.79 km/h)83.31 mph (134.07 km/h)
90 mph (144.84 km/h)88.21 mph (141.96 km/h)
95 mph (152.89 km/h)93.11 mph (149.85 km/h)
100 mph (160.93 km/h)98.01 mph (157.73 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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