Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/50r17 vs 215/55r17 Tire Comparison Side By Side
  235/50-17 215/55-17 Difference
Diameter inches (mm) 26.25 (666.8) 26.31 (668.3) 0.06 (1.5) 0.2%
Width inches (mm) 9.25 (235) 8.46 (215) -0.79 (-20) -8.5%
Circum. inches (mm) 82.47 (2094.81) 82.66 (2099.53) 0.19 (4.71) 0.2%
Sidewall Height inches (mm) 4.63 (117.5) 4.66 (118.25) 0.03 (0.75) 0.6%
Revolutions per mile (km) 768.25 (477.37) 766.53 (476.3) -1.72 (-1.07) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.04 mph (32.26 km/h)
25 mph (40.23 km/h)25.06 mph (40.32 km/h)
30 mph (48.28 km/h)30.07 mph (48.39 km/h)
35 mph (56.33 km/h)35.08 mph (56.45 km/h)
40 mph (64.37 km/h)40.09 mph (64.52 km/h)
45 mph (72.42 km/h)45.1 mph (72.58 km/h)
50 mph (80.47 km/h)50.11 mph (80.65 km/h)
55 mph (88.51 km/h)55.12 mph (88.71 km/h)
60 mph (96.56 km/h)60.13 mph (96.78 km/h)
65 mph (104.61 km/h)65.15 mph (104.84 km/h)
70 mph (112.65 km/h)70.16 mph (112.91 km/h)
75 mph (120.7 km/h)75.17 mph (120.97 km/h)
80 mph (128.75 km/h)80.18 mph (129.04 km/h)
85 mph (136.79 km/h)85.19 mph (137.1 km/h)
90 mph (144.84 km/h)90.2 mph (145.17 km/h)
95 mph (152.89 km/h)95.21 mph (153.23 km/h)
100 mph (160.93 km/h)100.22 mph (161.3 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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