Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
160/60r18 vs 160/80r18 Tire Comparison Side By Side
  160/60-18 160/80-18 Difference
Diameter inches (mm) 25.56 (649.2) 28.08 (713.2) 2.52 (64) 9.9%
Width inches (mm) 6.3 (160) 6.3 (160) 0 (0) 0%
Circum. inches (mm) 80.3 (2039.52) 88.21 (2240.58) 7.92 (201.06) 9.9%
Sidewall Height inches (mm) 3.78 (96) 5.04 (128) 1.26 (32) 33.3%
Revolutions per mile (km) 789.08 (490.31) 718.27 (446.31) -70.81 (-44) -9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.97 mph (35.36 km/h)
25 mph (40.23 km/h)27.46 mph (44.2 km/h)
30 mph (48.28 km/h)32.96 mph (53.04 km/h)
35 mph (56.33 km/h)38.45 mph (61.88 km/h)
40 mph (64.37 km/h)43.94 mph (70.72 km/h)
45 mph (72.42 km/h)49.44 mph (79.56 km/h)
50 mph (80.47 km/h)54.93 mph (88.4 km/h)
55 mph (88.51 km/h)60.42 mph (97.24 km/h)
60 mph (96.56 km/h)65.91 mph (106.08 km/h)
65 mph (104.61 km/h)71.41 mph (114.92 km/h)
70 mph (112.65 km/h)76.9 mph (123.76 km/h)
75 mph (120.7 km/h)82.39 mph (132.6 km/h)
80 mph (128.75 km/h)87.89 mph (141.44 km/h)
85 mph (136.79 km/h)93.38 mph (150.28 km/h)
90 mph (144.84 km/h)98.87 mph (159.12 km/h)
95 mph (152.89 km/h)104.37 mph (167.96 km/h)
100 mph (160.93 km/h)109.86 mph (176.8 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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