Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/80r14 vs 165/80r14 Tire Comparison Side By Side
  145/80-14 165/80-14 Difference
Diameter inches (mm) 23.13 (587.6) 24.39 (619.6) 1.26 (32) 5.4%
Width inches (mm) 5.71 (145) 6.5 (165) 0.79 (20) 13.8%
Circum. inches (mm) 72.68 (1846) 76.64 (1946.53) 3.96 (100.53) 5.4%
Sidewall Height inches (mm) 4.57 (116) 5.2 (132) 0.63 (16) 13.8%
Revolutions per mile (km) 871.8 (541.71) 826.78 (513.73) -45.03 (-27.98) -5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.09 mph (33.94 km/h)
25 mph (40.23 km/h)26.36 mph (42.42 km/h)
30 mph (48.28 km/h)31.63 mph (50.91 km/h)
35 mph (56.33 km/h)36.91 mph (59.39 km/h)
40 mph (64.37 km/h)42.18 mph (67.88 km/h)
45 mph (72.42 km/h)47.45 mph (76.36 km/h)
50 mph (80.47 km/h)52.72 mph (84.85 km/h)
55 mph (88.51 km/h)58 mph (93.33 km/h)
60 mph (96.56 km/h)63.27 mph (101.82 km/h)
65 mph (104.61 km/h)68.54 mph (110.3 km/h)
70 mph (112.65 km/h)73.81 mph (118.79 km/h)
75 mph (120.7 km/h)79.08 mph (127.27 km/h)
80 mph (128.75 km/h)84.36 mph (135.76 km/h)
85 mph (136.79 km/h)89.63 mph (144.24 km/h)
90 mph (144.84 km/h)94.9 mph (152.73 km/h)
95 mph (152.89 km/h)100.17 mph (161.21 km/h)
100 mph (160.93 km/h)105.45 mph (169.7 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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