Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/80r12 vs 165/65r14 Tire Comparison Side By Side
  155/80-12 165/65-14 Difference
Diameter inches (mm) 21.76 (552.8) 22.44 (570.1) 0.68 (17.3) 3.1%
Width inches (mm) 6.1 (155) 6.5 (165) 0.39 (10) 6.5%
Circum. inches (mm) 68.37 (1736.67) 70.51 (1791.02) 2.14 (54.35) 3.1%
Sidewall Height inches (mm) 4.88 (124) 4.22 (107.25) -0.66 (-16.75) -13.5%
Revolutions per mile (km) 926.68 (575.81) 898.56 (558.34) -28.12 (-17.47) -3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.63 mph (33.19 km/h)
25 mph (40.23 km/h)25.78 mph (41.49 km/h)
30 mph (48.28 km/h)30.94 mph (49.79 km/h)
35 mph (56.33 km/h)36.1 mph (58.09 km/h)
40 mph (64.37 km/h)41.25 mph (66.39 km/h)
45 mph (72.42 km/h)46.41 mph (74.69 km/h)
50 mph (80.47 km/h)51.56 mph (82.99 km/h)
55 mph (88.51 km/h)56.72 mph (91.28 km/h)
60 mph (96.56 km/h)61.88 mph (99.58 km/h)
65 mph (104.61 km/h)67.03 mph (107.88 km/h)
70 mph (112.65 km/h)72.19 mph (116.18 km/h)
75 mph (120.7 km/h)77.35 mph (124.48 km/h)
80 mph (128.75 km/h)82.5 mph (132.78 km/h)
85 mph (136.79 km/h)87.66 mph (141.08 km/h)
90 mph (144.84 km/h)92.82 mph (149.37 km/h)
95 mph (152.89 km/h)97.97 mph (157.67 km/h)
100 mph (160.93 km/h)103.13 mph (165.97 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
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