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 170/60r17 Tire Comparison Side By Side
  160/60-18 170/60-17 Difference
Diameter inches (mm) 25.56 (649.2) 25.03 (635.8) -0.53 (-13.4) -2.1%
Width inches (mm) 6.3 (160) 6.69 (170) 0.39 (10) 6.3%
Circum. inches (mm) 80.3 (2039.52) 78.64 (1997.42) -1.66 (-42.1) -2.1%
Sidewall Height inches (mm) 3.78 (96) 4.02 (102) 0.24 (6) 6.3%
Revolutions per mile (km) 789.08 (490.31) 805.71 (500.64) 16.63 (10.33) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.59 mph (31.52 km/h)
25 mph (40.23 km/h)24.48 mph (39.4 km/h)
30 mph (48.28 km/h)29.38 mph (47.28 km/h)
35 mph (56.33 km/h)34.28 mph (55.16 km/h)
40 mph (64.37 km/h)39.17 mph (63.05 km/h)
45 mph (72.42 km/h)44.07 mph (70.93 km/h)
50 mph (80.47 km/h)48.97 mph (78.81 km/h)
55 mph (88.51 km/h)53.86 mph (86.69 km/h)
60 mph (96.56 km/h)58.76 mph (94.57 km/h)
65 mph (104.61 km/h)63.66 mph (102.45 km/h)
70 mph (112.65 km/h)68.56 mph (110.33 km/h)
75 mph (120.7 km/h)73.45 mph (118.21 km/h)
80 mph (128.75 km/h)78.35 mph (126.09 km/h)
85 mph (136.79 km/h)83.25 mph (133.97 km/h)
90 mph (144.84 km/h)88.14 mph (141.85 km/h)
95 mph (152.89 km/h)93.04 mph (149.73 km/h)
100 mph (160.93 km/h)97.94 mph (157.61 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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