Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/70r13 vs 175/50r15 Tire Comparison Side By Side
  165/70-13 175/50-15 Difference
Diameter inches (mm) 22.09 (561.2) 21.89 (556) -0.2 (-5.2) -0.9%
Width inches (mm) 6.5 (165) 6.89 (175) 0.39 (10) 6.1%
Circum. inches (mm) 69.41 (1763.06) 68.77 (1746.73) -0.64 (-16.34) -0.9%
Sidewall Height inches (mm) 4.55 (115.5) 3.44 (87.5) -1.1 (-28) -24.2%
Revolutions per mile (km) 912.81 (567.19) 921.35 (572.5) 8.54 (5.3) 0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.81 mph (31.89 km/h)
25 mph (40.23 km/h)24.77 mph (39.86 km/h)
30 mph (48.28 km/h)29.72 mph (47.83 km/h)
35 mph (56.33 km/h)34.68 mph (55.81 km/h)
40 mph (64.37 km/h)39.63 mph (63.78 km/h)
45 mph (72.42 km/h)44.58 mph (71.75 km/h)
50 mph (80.47 km/h)49.54 mph (79.72 km/h)
55 mph (88.51 km/h)54.49 mph (87.69 km/h)
60 mph (96.56 km/h)59.44 mph (95.67 km/h)
65 mph (104.61 km/h)64.4 mph (103.64 km/h)
70 mph (112.65 km/h)69.35 mph (111.61 km/h)
75 mph (120.7 km/h)74.31 mph (119.58 km/h)
80 mph (128.75 km/h)79.26 mph (127.55 km/h)
85 mph (136.79 km/h)84.21 mph (135.53 km/h)
90 mph (144.84 km/h)89.17 mph (143.5 km/h)
95 mph (152.89 km/h)94.12 mph (151.47 km/h)
100 mph (160.93 km/h)99.07 mph (159.44 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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