Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/80r16 vs 110/90r17 Tire Comparison Side By Side
  120/80-16 110/90-17 Difference
Diameter inches (mm) 23.56 (598.4) 24.8 (629.8) 1.24 (31.4) 5.2%
Width inches (mm) 4.72 (120) 4.33 (110) -0.39 (-10) -8.3%
Circum. inches (mm) 74.01 (1879.93) 77.9 (1978.58) 3.88 (98.65) 5.2%
Sidewall Height inches (mm) 3.78 (96) 3.9 (99) 0.12 (3) 3.1%
Revolutions per mile (km) 856.07 (531.93) 813.39 (505.41) -42.68 (-26.52) -5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.05 mph (33.88 km/h)
25 mph (40.23 km/h)26.31 mph (42.34 km/h)
30 mph (48.28 km/h)31.57 mph (50.81 km/h)
35 mph (56.33 km/h)36.84 mph (59.28 km/h)
40 mph (64.37 km/h)42.1 mph (67.75 km/h)
45 mph (72.42 km/h)47.36 mph (76.22 km/h)
50 mph (80.47 km/h)52.62 mph (84.69 km/h)
55 mph (88.51 km/h)57.89 mph (93.16 km/h)
60 mph (96.56 km/h)63.15 mph (101.63 km/h)
65 mph (104.61 km/h)68.41 mph (110.1 km/h)
70 mph (112.65 km/h)73.67 mph (118.57 km/h)
75 mph (120.7 km/h)78.94 mph (127.03 km/h)
80 mph (128.75 km/h)84.2 mph (135.5 km/h)
85 mph (136.79 km/h)89.46 mph (143.97 km/h)
90 mph (144.84 km/h)94.72 mph (152.44 km/h)
95 mph (152.89 km/h)99.98 mph (160.91 km/h)
100 mph (160.93 km/h)105.25 mph (169.38 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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