Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/55r14 vs 165/45r15 Tire Comparison Side By Side
  155/55-14 165/45-15 Difference
Diameter inches (mm) 20.71 (526.1) 20.85 (529.5) 0.13 (3.4) 0.6%
Width inches (mm) 6.1 (155) 6.5 (165) 0.39 (10) 6.5%
Circum. inches (mm) 65.07 (1652.79) 65.49 (1663.47) 0.42 (10.68) 0.6%
Sidewall Height inches (mm) 3.36 (85.25) 2.92 (74.25) -0.43 (-11) -12.9%
Revolutions per mile (km) 973.71 (605.04) 967.46 (601.15) -6.25 (-3.89) -0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.13 mph (32.39 km/h)
25 mph (40.23 km/h)25.16 mph (40.49 km/h)
30 mph (48.28 km/h)30.19 mph (48.59 km/h)
35 mph (56.33 km/h)35.23 mph (56.69 km/h)
40 mph (64.37 km/h)40.26 mph (64.79 km/h)
45 mph (72.42 km/h)45.29 mph (72.89 km/h)
50 mph (80.47 km/h)50.32 mph (80.99 km/h)
55 mph (88.51 km/h)55.36 mph (89.09 km/h)
60 mph (96.56 km/h)60.39 mph (97.18 km/h)
65 mph (104.61 km/h)65.42 mph (105.28 km/h)
70 mph (112.65 km/h)70.45 mph (113.38 km/h)
75 mph (120.7 km/h)75.48 mph (121.48 km/h)
80 mph (128.75 km/h)80.52 mph (129.58 km/h)
85 mph (136.79 km/h)85.55 mph (137.68 km/h)
90 mph (144.84 km/h)90.58 mph (145.78 km/h)
95 mph (152.89 km/h)95.61 mph (153.88 km/h)
100 mph (160.93 km/h)100.65 mph (161.97 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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