Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/55r14 vs 135/70r13 Tire Comparison Side By Side
  155/55-14 135/70-13 Difference
Diameter inches (mm) 20.71 (526.1) 20.44 (519.2) -0.27 (-6.9) -1.3%
Width inches (mm) 6.1 (155) 5.31 (135) -0.79 (-20) -12.9%
Circum. inches (mm) 65.07 (1652.79) 64.22 (1631.11) -0.85 (-21.68) -1.3%
Sidewall Height inches (mm) 3.36 (85.25) 3.72 (94.5) 0.36 (9.25) 10.9%
Revolutions per mile (km) 973.71 (605.04) 986.65 (613.08) 12.94 (8.04) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.74 mph (31.76 km/h)
25 mph (40.23 km/h)24.67 mph (39.71 km/h)
30 mph (48.28 km/h)29.61 mph (47.65 km/h)
35 mph (56.33 km/h)34.54 mph (55.59 km/h)
40 mph (64.37 km/h)39.48 mph (63.53 km/h)
45 mph (72.42 km/h)44.41 mph (71.47 km/h)
50 mph (80.47 km/h)49.34 mph (79.41 km/h)
55 mph (88.51 km/h)54.28 mph (87.35 km/h)
60 mph (96.56 km/h)59.21 mph (95.29 km/h)
65 mph (104.61 km/h)64.15 mph (103.24 km/h)
70 mph (112.65 km/h)69.08 mph (111.18 km/h)
75 mph (120.7 km/h)74.02 mph (119.12 km/h)
80 mph (128.75 km/h)78.95 mph (127.06 km/h)
85 mph (136.79 km/h)83.89 mph (135 km/h)
90 mph (144.84 km/h)88.82 mph (142.94 km/h)
95 mph (152.89 km/h)93.75 mph (150.88 km/h)
100 mph (160.93 km/h)98.69 mph (158.82 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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