Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r19 vs 225/55r19 Tire Comparison Side By Side
  235/55-19 225/55-19 Difference
Diameter inches (mm) 29.18 (741.1) 28.74 (730.1) -0.43 (-11) -1.5%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 91.66 (2328.23) 90.3 (2293.68) -1.36 (-34.56) -1.5%
Sidewall Height inches (mm) 5.09 (129.25) 4.87 (123.75) -0.22 (-5.5) -4.3%
Revolutions per mile (km) 691.23 (429.51) 701.64 (435.98) 10.41 (6.47) 1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.7 mph (31.71 km/h)
25 mph (40.23 km/h)24.63 mph (39.64 km/h)
30 mph (48.28 km/h)29.55 mph (47.56 km/h)
35 mph (56.33 km/h)34.48 mph (55.49 km/h)
40 mph (64.37 km/h)39.41 mph (63.42 km/h)
45 mph (72.42 km/h)44.33 mph (71.35 km/h)
50 mph (80.47 km/h)49.26 mph (79.27 km/h)
55 mph (88.51 km/h)54.18 mph (87.2 km/h)
60 mph (96.56 km/h)59.11 mph (95.13 km/h)
65 mph (104.61 km/h)64.04 mph (103.05 km/h)
70 mph (112.65 km/h)68.96 mph (110.98 km/h)
75 mph (120.7 km/h)73.89 mph (118.91 km/h)
80 mph (128.75 km/h)78.81 mph (126.84 km/h)
85 mph (136.79 km/h)83.74 mph (134.76 km/h)
90 mph (144.84 km/h)88.66 mph (142.69 km/h)
95 mph (152.89 km/h)93.59 mph (150.62 km/h)
100 mph (160.93 km/h)98.52 mph (158.55 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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