Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
200/70r15 vs 190/90r15 Tire Comparison Side By Side
  200/70-15 190/90-15 Difference
Diameter inches (mm) 26.02 (661) 28.46 (723) 2.44 (62) 9.4%
Width inches (mm) 7.87 (200) 7.48 (190) -0.39 (-10) -5%
Circum. inches (mm) 81.76 (2076.59) 89.42 (2271.37) 7.67 (194.78) 9.4%
Sidewall Height inches (mm) 5.51 (140) 6.73 (171) 1.22 (31) 22.1%
Revolutions per mile (km) 774.99 (481.56) 708.53 (440.26) -66.46 (-41.3) -8.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.88 mph (35.21 km/h)
25 mph (40.23 km/h)27.34 mph (44.01 km/h)
30 mph (48.28 km/h)32.81 mph (52.81 km/h)
35 mph (56.33 km/h)38.28 mph (61.61 km/h)
40 mph (64.37 km/h)43.75 mph (70.41 km/h)
45 mph (72.42 km/h)49.22 mph (79.21 km/h)
50 mph (80.47 km/h)54.69 mph (88.01 km/h)
55 mph (88.51 km/h)60.16 mph (96.82 km/h)
60 mph (96.56 km/h)65.63 mph (105.62 km/h)
65 mph (104.61 km/h)71.1 mph (114.42 km/h)
70 mph (112.65 km/h)76.57 mph (123.22 km/h)
75 mph (120.7 km/h)82.03 mph (132.02 km/h)
80 mph (128.75 km/h)87.5 mph (140.82 km/h)
85 mph (136.79 km/h)92.97 mph (149.63 km/h)
90 mph (144.84 km/h)98.44 mph (158.43 km/h)
95 mph (152.89 km/h)103.91 mph (167.23 km/h)
100 mph (160.93 km/h)109.38 mph (176.03 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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