Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r17 vs 225/50r17 Tire Comparison Side By Side
  235/55-17 225/50-17 Difference
Diameter inches (mm) 27.18 (690.3) 25.86 (656.8) -1.32 (-33.5) -4.9%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 85.38 (2168.64) 81.24 (2063.4) -4.14 (-105.24) -4.9%
Sidewall Height inches (mm) 5.09 (129.25) 4.43 (112.5) -0.66 (-16.75) -13%
Revolutions per mile (km) 742.1 (461.12) 779.95 (484.64) 37.85 (23.52) 5.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.03 mph (30.62 km/h)
25 mph (40.23 km/h)23.79 mph (38.28 km/h)
30 mph (48.28 km/h)28.54 mph (45.94 km/h)
35 mph (56.33 km/h)33.3 mph (53.59 km/h)
40 mph (64.37 km/h)38.06 mph (61.25 km/h)
45 mph (72.42 km/h)42.82 mph (68.91 km/h)
50 mph (80.47 km/h)47.57 mph (76.56 km/h)
55 mph (88.51 km/h)52.33 mph (84.22 km/h)
60 mph (96.56 km/h)57.09 mph (91.87 km/h)
65 mph (104.61 km/h)61.85 mph (99.53 km/h)
70 mph (112.65 km/h)66.6 mph (107.19 km/h)
75 mph (120.7 km/h)71.36 mph (114.84 km/h)
80 mph (128.75 km/h)76.12 mph (122.5 km/h)
85 mph (136.79 km/h)80.87 mph (130.16 km/h)
90 mph (144.84 km/h)85.63 mph (137.81 km/h)
95 mph (152.89 km/h)90.39 mph (145.47 km/h)
100 mph (160.93 km/h)95.15 mph (153.12 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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