Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/50r18 vs 285/35r19 Tire Comparison Side By Side
  235/50-18 285/35-19 Difference
Diameter inches (mm) 27.25 (692.2) 26.85 (682.1) -0.4 (-10.1) -1.5%
Width inches (mm) 9.25 (235) 11.22 (285) 1.97 (50) 21.3%
Circum. inches (mm) 85.61 (2174.61) 84.37 (2142.88) -1.25 (-31.73) -1.5%
Sidewall Height inches (mm) 4.63 (117.5) 3.93 (99.75) -0.7 (-17.75) -15.1%
Revolutions per mile (km) 740.06 (459.85) 751.02 (466.66) 10.96 (6.81) 1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.71 mph (31.72 km/h)
25 mph (40.23 km/h)24.64 mph (39.65 km/h)
30 mph (48.28 km/h)29.56 mph (47.58 km/h)
35 mph (56.33 km/h)34.49 mph (55.51 km/h)
40 mph (64.37 km/h)39.42 mph (63.43 km/h)
45 mph (72.42 km/h)44.34 mph (71.36 km/h)
50 mph (80.47 km/h)49.27 mph (79.29 km/h)
55 mph (88.51 km/h)54.2 mph (87.22 km/h)
60 mph (96.56 km/h)59.12 mph (95.15 km/h)
65 mph (104.61 km/h)64.05 mph (103.08 km/h)
70 mph (112.65 km/h)68.98 mph (111.01 km/h)
75 mph (120.7 km/h)73.91 mph (118.94 km/h)
80 mph (128.75 km/h)78.83 mph (126.87 km/h)
85 mph (136.79 km/h)83.76 mph (134.8 km/h)
90 mph (144.84 km/h)88.69 mph (142.73 km/h)
95 mph (152.89 km/h)93.61 mph (150.66 km/h)
100 mph (160.93 km/h)98.54 mph (158.59 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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