Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/70r14 vs 155/80r13 Tire Comparison Side By Side
  165/70-14 155/80-13 Difference
Diameter inches (mm) 23.09 (586.6) 22.76 (578.2) -0.33 (-8.4) -1.4%
Width inches (mm) 6.5 (165) 6.1 (155) -0.39 (-10) -6.1%
Circum. inches (mm) 72.55 (1842.86) 71.51 (1816.47) -1.04 (-26.39) -1.4%
Sidewall Height inches (mm) 4.55 (115.5) 4.88 (124) 0.33 (8.5) 7.4%
Revolutions per mile (km) 873.29 (542.63) 885.97 (550.52) 12.69 (7.88) 1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.71 mph (31.73 km/h)
25 mph (40.23 km/h)24.64 mph (39.66 km/h)
30 mph (48.28 km/h)29.57 mph (47.59 km/h)
35 mph (56.33 km/h)34.5 mph (55.52 km/h)
40 mph (64.37 km/h)39.43 mph (63.45 km/h)
45 mph (72.42 km/h)44.36 mph (71.38 km/h)
50 mph (80.47 km/h)49.28 mph (79.32 km/h)
55 mph (88.51 km/h)54.21 mph (87.25 km/h)
60 mph (96.56 km/h)59.14 mph (95.18 km/h)
65 mph (104.61 km/h)64.07 mph (103.11 km/h)
70 mph (112.65 km/h)69 mph (111.04 km/h)
75 mph (120.7 km/h)73.93 mph (118.97 km/h)
80 mph (128.75 km/h)78.85 mph (126.9 km/h)
85 mph (136.79 km/h)83.78 mph (134.84 km/h)
90 mph (144.84 km/h)88.71 mph (142.77 km/h)
95 mph (152.89 km/h)93.64 mph (150.7 km/h)
100 mph (160.93 km/h)98.57 mph (158.63 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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