Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/80r13 vs 175/55r14 Tire Comparison Side By Side
  135/80-13 175/55-14 Difference
Diameter inches (mm) 21.5 (546.2) 21.58 (548.1) 0.07 (1.9) 0.3%
Width inches (mm) 5.31 (135) 6.89 (175) 1.57 (40) 29.6%
Circum. inches (mm) 67.56 (1715.94) 67.79 (1721.91) 0.24 (5.97) 0.3%
Sidewall Height inches (mm) 4.25 (108) 3.79 (96.25) -0.46 (-11.75) -10.9%
Revolutions per mile (km) 937.88 (582.77) 934.63 (580.75) -3.25 (-2.02) -0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.07 mph (32.3 km/h)
25 mph (40.23 km/h)25.09 mph (40.37 km/h)
30 mph (48.28 km/h)30.1 mph (48.45 km/h)
35 mph (56.33 km/h)35.12 mph (56.52 km/h)
40 mph (64.37 km/h)40.14 mph (64.6 km/h)
45 mph (72.42 km/h)45.16 mph (72.67 km/h)
50 mph (80.47 km/h)50.17 mph (80.75 km/h)
55 mph (88.51 km/h)55.19 mph (88.82 km/h)
60 mph (96.56 km/h)60.21 mph (96.9 km/h)
65 mph (104.61 km/h)65.23 mph (104.97 km/h)
70 mph (112.65 km/h)70.24 mph (113.05 km/h)
75 mph (120.7 km/h)75.26 mph (121.12 km/h)
80 mph (128.75 km/h)80.28 mph (129.2 km/h)
85 mph (136.79 km/h)85.3 mph (137.27 km/h)
90 mph (144.84 km/h)90.31 mph (145.35 km/h)
95 mph (152.89 km/h)95.33 mph (153.42 km/h)
100 mph (160.93 km/h)100.35 mph (161.49 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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