Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/65r14 vs 145/70r14 Tire Comparison Side By Side
  155/65-14 145/70-14 Difference
Diameter inches (mm) 21.93 (557.1) 21.99 (558.6) 0.06 (1.5) 0.3%
Width inches (mm) 6.1 (155) 5.71 (145) -0.39 (-10) -6.5%
Circum. inches (mm) 68.9 (1750.18) 69.09 (1754.89) 0.19 (4.71) 0.3%
Sidewall Height inches (mm) 3.97 (100.75) 4 (101.5) 0.03 (0.75) 0.7%
Revolutions per mile (km) 919.53 (571.37) 917.06 (569.83) -2.47 (-1.53) -0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.05 mph (32.27 km/h)
25 mph (40.23 km/h)25.07 mph (40.34 km/h)
30 mph (48.28 km/h)30.08 mph (48.41 km/h)
35 mph (56.33 km/h)35.09 mph (56.48 km/h)
40 mph (64.37 km/h)40.11 mph (64.55 km/h)
45 mph (72.42 km/h)45.12 mph (72.62 km/h)
50 mph (80.47 km/h)50.13 mph (80.68 km/h)
55 mph (88.51 km/h)55.15 mph (88.75 km/h)
60 mph (96.56 km/h)60.16 mph (96.82 km/h)
65 mph (104.61 km/h)65.18 mph (104.89 km/h)
70 mph (112.65 km/h)70.19 mph (112.96 km/h)
75 mph (120.7 km/h)75.2 mph (121.03 km/h)
80 mph (128.75 km/h)80.22 mph (129.09 km/h)
85 mph (136.79 km/h)85.23 mph (137.16 km/h)
90 mph (144.84 km/h)90.24 mph (145.23 km/h)
95 mph (152.89 km/h)95.26 mph (153.3 km/h)
100 mph (160.93 km/h)100.27 mph (161.37 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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