Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/45r17 vs 205/50r17 Tire Comparison Side By Side
  235/45-17 205/50-17 Difference
Diameter inches (mm) 25.33 (643.3) 25.07 (636.8) -0.26 (-6.5) -1%
Width inches (mm) 9.25 (235) 8.07 (205) -1.18 (-30) -12.8%
Circum. inches (mm) 79.57 (2020.99) 78.76 (2000.57) -0.8 (-20.42) -1%
Sidewall Height inches (mm) 4.16 (105.75) 4.04 (102.5) -0.13 (-3.25) -3.1%
Revolutions per mile (km) 796.32 (494.81) 804.44 (499.86) 8.13 (5.05) 1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.8 mph (31.86 km/h)
25 mph (40.23 km/h)24.75 mph (39.83 km/h)
30 mph (48.28 km/h)29.7 mph (47.79 km/h)
35 mph (56.33 km/h)34.65 mph (55.76 km/h)
40 mph (64.37 km/h)39.6 mph (63.72 km/h)
45 mph (72.42 km/h)44.55 mph (71.69 km/h)
50 mph (80.47 km/h)49.49 mph (79.65 km/h)
55 mph (88.51 km/h)54.44 mph (87.62 km/h)
60 mph (96.56 km/h)59.39 mph (95.59 km/h)
65 mph (104.61 km/h)64.34 mph (103.55 km/h)
70 mph (112.65 km/h)69.29 mph (111.52 km/h)
75 mph (120.7 km/h)74.24 mph (119.48 km/h)
80 mph (128.75 km/h)79.19 mph (127.45 km/h)
85 mph (136.79 km/h)84.14 mph (135.41 km/h)
90 mph (144.84 km/h)89.09 mph (143.38 km/h)
95 mph (152.89 km/h)94.04 mph (151.34 km/h)
100 mph (160.93 km/h)98.99 mph (159.31 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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