Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/75r14 vs 155/65r14 Tire Comparison Side By Side
  155/75-14 155/65-14 Difference
Diameter inches (mm) 23.15 (588.1) 21.93 (557.1) -1.22 (-31) -5.3%
Width inches (mm) 6.1 (155) 6.1 (155) 0 (0) 0%
Circum. inches (mm) 72.74 (1847.57) 68.9 (1750.18) -3.83 (-97.39) -5.3%
Sidewall Height inches (mm) 4.58 (116.25) 3.97 (100.75) -0.61 (-15.5) -13.3%
Revolutions per mile (km) 871.06 (541.25) 919.53 (571.37) 48.47 (30.12) 5.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.95 mph (30.49 km/h)
25 mph (40.23 km/h)23.68 mph (38.11 km/h)
30 mph (48.28 km/h)28.42 mph (45.74 km/h)
35 mph (56.33 km/h)33.16 mph (53.36 km/h)
40 mph (64.37 km/h)37.89 mph (60.98 km/h)
45 mph (72.42 km/h)42.63 mph (68.6 km/h)
50 mph (80.47 km/h)47.36 mph (76.23 km/h)
55 mph (88.51 km/h)52.1 mph (83.85 km/h)
60 mph (96.56 km/h)56.84 mph (91.47 km/h)
65 mph (104.61 km/h)61.57 mph (99.09 km/h)
70 mph (112.65 km/h)66.31 mph (106.72 km/h)
75 mph (120.7 km/h)71.05 mph (114.34 km/h)
80 mph (128.75 km/h)75.78 mph (121.96 km/h)
85 mph (136.79 km/h)80.52 mph (129.58 km/h)
90 mph (144.84 km/h)85.26 mph (137.21 km/h)
95 mph (152.89 km/h)89.99 mph (144.83 km/h)
100 mph (160.93 km/h)94.73 mph (152.45 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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