Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/80r10 vs 155/55r12 Tire Comparison Side By Side
  145/80-10 155/55-12 Difference
Diameter inches (mm) 19.13 (486) 18.71 (475.3) -0.42 (-10.7) -2.2%
Width inches (mm) 5.71 (145) 6.1 (155) 0.39 (10) 6.9%
Circum. inches (mm) 60.11 (1526.81) 58.79 (1493.2) -1.32 (-33.62) -2.2%
Sidewall Height inches (mm) 4.57 (116) 3.36 (85.25) -1.21 (-30.75) -26.5%
Revolutions per mile (km) 1054.05 (654.96) 1077.78 (669.7) 23.73 (14.74) 2.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.56 mph (31.48 km/h)
25 mph (40.23 km/h)24.45 mph (39.35 km/h)
30 mph (48.28 km/h)29.34 mph (47.22 km/h)
35 mph (56.33 km/h)34.23 mph (55.09 km/h)
40 mph (64.37 km/h)39.12 mph (62.96 km/h)
45 mph (72.42 km/h)44.01 mph (70.83 km/h)
50 mph (80.47 km/h)48.9 mph (78.7 km/h)
55 mph (88.51 km/h)53.79 mph (86.57 km/h)
60 mph (96.56 km/h)58.68 mph (94.43 km/h)
65 mph (104.61 km/h)63.57 mph (102.3 km/h)
70 mph (112.65 km/h)68.46 mph (110.17 km/h)
75 mph (120.7 km/h)73.35 mph (118.04 km/h)
80 mph (128.75 km/h)78.24 mph (125.91 km/h)
85 mph (136.79 km/h)83.13 mph (133.78 km/h)
90 mph (144.84 km/h)88.02 mph (141.65 km/h)
95 mph (152.89 km/h)92.91 mph (149.52 km/h)
100 mph (160.93 km/h)97.8 mph (157.39 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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