Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
60/80r17 vs 60/70r17 Tire Comparison Side By Side
  60/80-17 60/70-17 Difference
Diameter inches (mm) 20.78 (527.8) 20.31 (515.8) -0.47 (-12) -2.3%
Width inches (mm) 2.36 (60) 2.36 (60) 0 (0) 0%
Circum. inches (mm) 65.28 (1658.13) 63.8 (1620.43) -1.48 (-37.7) -2.3%
Sidewall Height inches (mm) 1.89 (48) 1.65 (42) -0.24 (-6) -12.5%
Revolutions per mile (km) 970.58 (603.09) 993.16 (617.12) 22.58 (14.03) 2.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.55 mph (31.46 km/h)
25 mph (40.23 km/h)24.43 mph (39.32 km/h)
30 mph (48.28 km/h)29.32 mph (47.18 km/h)
35 mph (56.33 km/h)34.2 mph (55.05 km/h)
40 mph (64.37 km/h)39.09 mph (62.91 km/h)
45 mph (72.42 km/h)43.98 mph (70.77 km/h)
50 mph (80.47 km/h)48.86 mph (78.64 km/h)
55 mph (88.51 km/h)53.75 mph (86.5 km/h)
60 mph (96.56 km/h)58.64 mph (94.37 km/h)
65 mph (104.61 km/h)63.52 mph (102.23 km/h)
70 mph (112.65 km/h)68.41 mph (110.09 km/h)
75 mph (120.7 km/h)73.29 mph (117.96 km/h)
80 mph (128.75 km/h)78.18 mph (125.82 km/h)
85 mph (136.79 km/h)83.07 mph (133.68 km/h)
90 mph (144.84 km/h)87.95 mph (141.55 km/h)
95 mph (152.89 km/h)92.84 mph (149.41 km/h)
100 mph (160.93 km/h)97.73 mph (157.28 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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