Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/70r12 vs 165/55r14 Tire Comparison Side By Side
  155/70-12 165/55-14 Difference
Diameter inches (mm) 20.54 (521.8) 21.15 (537.1) 0.6 (15.3) 2.9%
Width inches (mm) 6.1 (155) 6.5 (165) 0.39 (10) 6.5%
Circum. inches (mm) 64.54 (1639.28) 66.43 (1687.35) 1.89 (48.07) 2.9%
Sidewall Height inches (mm) 4.27 (108.5) 3.57 (90.75) -0.7 (-17.75) -16.4%
Revolutions per mile (km) 981.74 (610.02) 953.77 (592.64) -27.97 (-17.38) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.59 mph (33.13 km/h)
25 mph (40.23 km/h)25.73 mph (41.41 km/h)
30 mph (48.28 km/h)30.88 mph (49.7 km/h)
35 mph (56.33 km/h)36.03 mph (57.98 km/h)
40 mph (64.37 km/h)41.17 mph (66.26 km/h)
45 mph (72.42 km/h)46.32 mph (74.54 km/h)
50 mph (80.47 km/h)51.47 mph (82.83 km/h)
55 mph (88.51 km/h)56.61 mph (91.11 km/h)
60 mph (96.56 km/h)61.76 mph (99.39 km/h)
65 mph (104.61 km/h)66.91 mph (107.67 km/h)
70 mph (112.65 km/h)72.05 mph (115.96 km/h)
75 mph (120.7 km/h)77.2 mph (124.24 km/h)
80 mph (128.75 km/h)82.35 mph (132.52 km/h)
85 mph (136.79 km/h)87.49 mph (140.81 km/h)
90 mph (144.84 km/h)92.64 mph (149.09 km/h)
95 mph (152.89 km/h)97.79 mph (157.37 km/h)
100 mph (160.93 km/h)102.93 mph (165.65 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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