Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/55r15 vs 155/75r15 Tire Comparison Side By Side
  155/55-15 155/75-15 Difference
Diameter inches (mm) 21.71 (551.5) 24.15 (613.5) 2.44 (62) 11.2%
Width inches (mm) 6.1 (155) 6.1 (155) 0 (0) 0%
Circum. inches (mm) 68.21 (1732.59) 75.88 (1927.37) 7.67 (194.78) 11.2%
Sidewall Height inches (mm) 3.36 (85.25) 4.58 (116.25) 1.22 (31) 36.4%
Revolutions per mile (km) 928.87 (577.17) 835 (518.84) -93.87 (-58.33) -10.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.25 mph (35.81 km/h)
25 mph (40.23 km/h)27.81 mph (44.76 km/h)
30 mph (48.28 km/h)33.37 mph (53.71 km/h)
35 mph (56.33 km/h)38.93 mph (62.66 km/h)
40 mph (64.37 km/h)44.5 mph (71.61 km/h)
45 mph (72.42 km/h)50.06 mph (80.56 km/h)
50 mph (80.47 km/h)55.62 mph (89.51 km/h)
55 mph (88.51 km/h)61.18 mph (98.46 km/h)
60 mph (96.56 km/h)66.75 mph (107.42 km/h)
65 mph (104.61 km/h)72.31 mph (116.37 km/h)
70 mph (112.65 km/h)77.87 mph (125.32 km/h)
75 mph (120.7 km/h)83.43 mph (134.27 km/h)
80 mph (128.75 km/h)88.99 mph (143.22 km/h)
85 mph (136.79 km/h)94.56 mph (152.17 km/h)
90 mph (144.84 km/h)100.12 mph (161.12 km/h)
95 mph (152.89 km/h)105.68 mph (170.08 km/h)
100 mph (160.93 km/h)111.24 mph (179.03 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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