Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/80r14 vs 155/70r14 Tire Comparison Side By Side
  135/80-14 155/70-14 Difference
Diameter inches (mm) 22.5 (571.6) 22.54 (572.6) 0.04 (1) 0.2%
Width inches (mm) 5.31 (135) 6.1 (155) 0.79 (20) 14.8%
Circum. inches (mm) 70.7 (1795.73) 70.82 (1798.88) 0.12 (3.14) 0.2%
Sidewall Height inches (mm) 4.25 (108) 4.27 (108.5) 0.02 (0.5) 0.5%
Revolutions per mile (km) 896.2 (556.87) 894.64 (555.9) -1.57 (-0.97) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.03 mph (32.24 km/h)
25 mph (40.23 km/h)25.04 mph (40.3 km/h)
30 mph (48.28 km/h)30.05 mph (48.36 km/h)
35 mph (56.33 km/h)35.06 mph (56.43 km/h)
40 mph (64.37 km/h)40.07 mph (64.49 km/h)
45 mph (72.42 km/h)45.08 mph (72.55 km/h)
50 mph (80.47 km/h)50.09 mph (80.61 km/h)
55 mph (88.51 km/h)55.1 mph (88.67 km/h)
60 mph (96.56 km/h)60.1 mph (96.73 km/h)
65 mph (104.61 km/h)65.11 mph (104.79 km/h)
70 mph (112.65 km/h)70.12 mph (112.85 km/h)
75 mph (120.7 km/h)75.13 mph (120.91 km/h)
80 mph (128.75 km/h)80.14 mph (128.97 km/h)
85 mph (136.79 km/h)85.15 mph (137.03 km/h)
90 mph (144.84 km/h)90.16 mph (145.09 km/h)
95 mph (152.89 km/h)95.17 mph (153.16 km/h)
100 mph (160.93 km/h)100.17 mph (161.22 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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