Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
110/80r18 vs 130/80r18 Tire Comparison Side By Side
  110/80-18 130/80-18 Difference
Diameter inches (mm) 24.93 (633.2) 26.19 (665.2) 1.26 (32) 5.1%
Width inches (mm) 4.33 (110) 5.12 (130) 0.79 (20) 18.2%
Circum. inches (mm) 78.32 (1989.26) 82.28 (2089.79) 3.96 (100.53) 5.1%
Sidewall Height inches (mm) 3.46 (88) 4.09 (104) 0.63 (16) 18.2%
Revolutions per mile (km) 809.02 (502.7) 770.1 (478.52) -38.92 (-24.18) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.01 mph (33.81 km/h)
25 mph (40.23 km/h)26.26 mph (42.27 km/h)
30 mph (48.28 km/h)31.52 mph (50.72 km/h)
35 mph (56.33 km/h)36.77 mph (59.17 km/h)
40 mph (64.37 km/h)42.02 mph (67.63 km/h)
45 mph (72.42 km/h)47.27 mph (76.08 km/h)
50 mph (80.47 km/h)52.53 mph (84.53 km/h)
55 mph (88.51 km/h)57.78 mph (92.99 km/h)
60 mph (96.56 km/h)63.03 mph (101.44 km/h)
65 mph (104.61 km/h)68.28 mph (109.89 km/h)
70 mph (112.65 km/h)73.54 mph (118.35 km/h)
75 mph (120.7 km/h)78.79 mph (126.8 km/h)
80 mph (128.75 km/h)84.04 mph (135.25 km/h)
85 mph (136.79 km/h)89.3 mph (143.71 km/h)
90 mph (144.84 km/h)94.55 mph (152.16 km/h)
95 mph (152.89 km/h)99.8 mph (160.61 km/h)
100 mph (160.93 km/h)105.05 mph (169.07 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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