Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
190/55r17 vs 180/55r17 Tire Comparison Side By Side
  190/55-17 180/55-17 Difference
Diameter inches (mm) 25.23 (640.8) 24.8 (629.8) -0.43 (-11) -1.7%
Width inches (mm) 7.48 (190) 7.09 (180) -0.39 (-10) -5.3%
Circum. inches (mm) 79.26 (2013.13) 77.9 (1978.58) -1.36 (-34.56) -1.7%
Sidewall Height inches (mm) 4.11 (104.5) 3.9 (99) -0.22 (-5.5) -5.3%
Revolutions per mile (km) 799.42 (496.74) 813.39 (505.41) 13.96 (8.68) 1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.66 mph (31.63 km/h)
25 mph (40.23 km/h)24.57 mph (39.54 km/h)
30 mph (48.28 km/h)29.49 mph (47.45 km/h)
35 mph (56.33 km/h)34.4 mph (55.36 km/h)
40 mph (64.37 km/h)39.31 mph (63.27 km/h)
45 mph (72.42 km/h)44.23 mph (71.18 km/h)
50 mph (80.47 km/h)49.14 mph (79.09 km/h)
55 mph (88.51 km/h)54.06 mph (86.99 km/h)
60 mph (96.56 km/h)58.97 mph (94.9 km/h)
65 mph (104.61 km/h)63.88 mph (102.81 km/h)
70 mph (112.65 km/h)68.8 mph (110.72 km/h)
75 mph (120.7 km/h)73.71 mph (118.63 km/h)
80 mph (128.75 km/h)78.63 mph (126.54 km/h)
85 mph (136.79 km/h)83.54 mph (134.45 km/h)
90 mph (144.84 km/h)88.46 mph (142.35 km/h)
95 mph (152.89 km/h)93.37 mph (150.26 km/h)
100 mph (160.93 km/h)98.28 mph (158.17 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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