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 235/50r17 Tire Comparison Side By Side
  235/45-17 235/50-17 Difference
Diameter inches (mm) 25.33 (643.3) 26.25 (666.8) 0.93 (23.5) 3.7%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 79.57 (2020.99) 82.47 (2094.81) 2.91 (73.83) 3.7%
Sidewall Height inches (mm) 4.16 (105.75) 4.63 (117.5) 0.46 (11.75) 11.1%
Revolutions per mile (km) 796.32 (494.81) 768.25 (477.37) -28.06 (-17.44) -3.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.73 mph (33.36 km/h)
25 mph (40.23 km/h)25.91 mph (41.7 km/h)
30 mph (48.28 km/h)31.1 mph (50.04 km/h)
35 mph (56.33 km/h)36.28 mph (58.38 km/h)
40 mph (64.37 km/h)41.46 mph (66.73 km/h)
45 mph (72.42 km/h)46.64 mph (75.07 km/h)
50 mph (80.47 km/h)51.83 mph (83.41 km/h)
55 mph (88.51 km/h)57.01 mph (91.75 km/h)
60 mph (96.56 km/h)62.19 mph (100.09 km/h)
65 mph (104.61 km/h)67.37 mph (108.43 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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