Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/80r13 vs 205/60r16 Tire Comparison Side By Side
  180/80-13 205/60-16 Difference
Diameter inches (mm) 24.34 (618.2) 25.69 (652.4) 1.35 (34.2) 5.5%
Width inches (mm) 7.09 (180) 8.07 (205) 0.98 (25) 13.9%
Circum. inches (mm) 76.46 (1942.13) 80.69 (2049.58) 4.23 (107.44) 5.5%
Sidewall Height inches (mm) 5.67 (144) 4.84 (123) -0.83 (-21) -14.6%
Revolutions per mile (km) 828.65 (514.9) 785.21 (487.91) -43.44 (-26.99) -5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.11 mph (33.97 km/h)
25 mph (40.23 km/h)26.38 mph (42.46 km/h)
30 mph (48.28 km/h)31.66 mph (50.95 km/h)
35 mph (56.33 km/h)36.94 mph (59.44 km/h)
40 mph (64.37 km/h)42.21 mph (67.94 km/h)
45 mph (72.42 km/h)47.49 mph (76.43 km/h)
50 mph (80.47 km/h)52.77 mph (84.92 km/h)
55 mph (88.51 km/h)58.04 mph (93.41 km/h)
60 mph (96.56 km/h)63.32 mph (101.9 km/h)
65 mph (104.61 km/h)68.6 mph (110.39 km/h)
70 mph (112.65 km/h)73.87 mph (118.89 km/h)
75 mph (120.7 km/h)79.15 mph (127.38 km/h)
80 mph (128.75 km/h)84.43 mph (135.87 km/h)
85 mph (136.79 km/h)89.7 mph (144.36 km/h)
90 mph (144.84 km/h)94.98 mph (152.85 km/h)
95 mph (152.89 km/h)100.26 mph (161.35 km/h)
100 mph (160.93 km/h)105.53 mph (169.84 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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