Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/70r15 vs 155/60r15 Tire Comparison Side By Side
  155/70-15 155/60-15 Difference
Diameter inches (mm) 23.54 (598) 22.32 (567) -1.22 (-31) -5.2%
Width inches (mm) 6.1 (155) 6.1 (155) 0 (0) 0%
Circum. inches (mm) 73.96 (1878.67) 70.13 (1781.28) -3.83 (-97.39) -5.2%
Sidewall Height inches (mm) 4.27 (108.5) 3.66 (93) -0.61 (-15.5) -14.3%
Revolutions per mile (km) 856.64 (532.29) 903.47 (561.39) 46.84 (29.1) 5.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.96 mph (30.52 km/h)
25 mph (40.23 km/h)23.7 mph (38.15 km/h)
30 mph (48.28 km/h)28.44 mph (45.78 km/h)
35 mph (56.33 km/h)33.19 mph (53.41 km/h)
40 mph (64.37 km/h)37.93 mph (61.04 km/h)
45 mph (72.42 km/h)42.67 mph (68.67 km/h)
50 mph (80.47 km/h)47.41 mph (76.3 km/h)
55 mph (88.51 km/h)52.15 mph (83.93 km/h)
60 mph (96.56 km/h)56.89 mph (91.56 km/h)
65 mph (104.61 km/h)61.63 mph (99.18 km/h)
70 mph (112.65 km/h)66.37 mph (106.81 km/h)
75 mph (120.7 km/h)71.11 mph (114.44 km/h)
80 mph (128.75 km/h)75.85 mph (122.07 km/h)
85 mph (136.79 km/h)80.59 mph (129.7 km/h)
90 mph (144.84 km/h)85.33 mph (137.33 km/h)
95 mph (152.89 km/h)90.08 mph (144.96 km/h)
100 mph (160.93 km/h)94.82 mph (152.59 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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