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 165/70r13 Tire Comparison Side By Side
  155/80-12 165/70-13 Difference
Diameter inches (mm) 21.76 (552.8) 22.09 (561.2) 0.33 (8.4) 1.5%
Width inches (mm) 6.1 (155) 6.5 (165) 0.39 (10) 6.5%
Circum. inches (mm) 68.37 (1736.67) 69.41 (1763.06) 1.04 (26.39) 1.5%
Sidewall Height inches (mm) 4.88 (124) 4.55 (115.5) -0.33 (-8.5) -6.9%
Revolutions per mile (km) 926.68 (575.81) 912.81 (567.19) -13.87 (-8.62) -1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.3 mph (32.68 km/h)
25 mph (40.23 km/h)25.38 mph (40.85 km/h)
30 mph (48.28 km/h)30.46 mph (49.01 km/h)
35 mph (56.33 km/h)35.53 mph (57.18 km/h)
40 mph (64.37 km/h)40.61 mph (65.35 km/h)
45 mph (72.42 km/h)45.68 mph (73.52 km/h)
50 mph (80.47 km/h)50.76 mph (81.69 km/h)
55 mph (88.51 km/h)55.84 mph (89.86 km/h)
60 mph (96.56 km/h)60.91 mph (98.03 km/h)
65 mph (104.61 km/h)65.99 mph (106.2 km/h)
70 mph (112.65 km/h)71.06 mph (114.37 km/h)
75 mph (120.7 km/h)76.14 mph (122.54 km/h)
80 mph (128.75 km/h)81.22 mph (130.7 km/h)
85 mph (136.79 km/h)86.29 mph (138.87 km/h)
90 mph (144.84 km/h)91.37 mph (147.04 km/h)
95 mph (152.89 km/h)96.44 mph (155.21 km/h)
100 mph (160.93 km/h)101.52 mph (163.38 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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