Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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155/80r13 vs 185/65r15 Tire Comparison Side By Side
  155/80-13 185/65-15 Difference
Diameter inches (mm) 22.76 (578.2) 24.47 (621.5) 1.7 (43.3) 7.5%
Width inches (mm) 6.1 (155) 7.28 (185) 1.18 (30) 19.4%
Circum. inches (mm) 71.51 (1816.47) 76.87 (1952.5) 5.36 (136.03) 7.5%
Sidewall Height inches (mm) 4.88 (124) 4.73 (120.25) -0.15 (-3.75) -3%
Revolutions per mile (km) 885.97 (550.52) 824.25 (512.16) -61.73 (-38.35) -7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.5 mph (34.6 km/h)
25 mph (40.23 km/h)26.87 mph (43.25 km/h)
30 mph (48.28 km/h)32.25 mph (51.9 km/h)
35 mph (56.33 km/h)37.62 mph (60.55 km/h)
40 mph (64.37 km/h)43 mph (69.19 km/h)
45 mph (72.42 km/h)48.37 mph (77.84 km/h)
50 mph (80.47 km/h)53.74 mph (86.49 km/h)
55 mph (88.51 km/h)59.12 mph (95.14 km/h)
60 mph (96.56 km/h)64.49 mph (103.79 km/h)
65 mph (104.61 km/h)69.87 mph (112.44 km/h)
70 mph (112.65 km/h)75.24 mph (121.09 km/h)
75 mph (120.7 km/h)80.62 mph (129.74 km/h)
80 mph (128.75 km/h)85.99 mph (138.39 km/h)
85 mph (136.79 km/h)91.37 mph (147.04 km/h)
90 mph (144.84 km/h)96.74 mph (155.69 km/h)
95 mph (152.89 km/h)102.11 mph (164.34 km/h)
100 mph (160.93 km/h)107.49 mph (172.99 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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