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 155/65r13 Tire Comparison Side By Side
  145/80-10 155/65-13 Difference
Diameter inches (mm) 19.13 (486) 20.93 (531.7) 1.8 (45.7) 9.4%
Width inches (mm) 5.71 (145) 6.1 (155) 0.39 (10) 6.9%
Circum. inches (mm) 60.11 (1526.81) 65.76 (1670.38) 5.65 (143.57) 9.4%
Sidewall Height inches (mm) 4.57 (116) 3.97 (100.75) -0.6 (-15.25) -13.1%
Revolutions per mile (km) 1054.05 (654.96) 963.46 (598.66) -90.6 (-56.29) -8.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.88 mph (35.21 km/h)
25 mph (40.23 km/h)27.35 mph (44.02 km/h)
30 mph (48.28 km/h)32.82 mph (52.82 km/h)
35 mph (56.33 km/h)38.29 mph (61.62 km/h)
40 mph (64.37 km/h)43.76 mph (70.43 km/h)
45 mph (72.42 km/h)49.23 mph (79.23 km/h)
50 mph (80.47 km/h)54.7 mph (88.03 km/h)
55 mph (88.51 km/h)60.17 mph (96.84 km/h)
60 mph (96.56 km/h)65.64 mph (105.64 km/h)
65 mph (104.61 km/h)71.11 mph (114.44 km/h)
70 mph (112.65 km/h)76.58 mph (123.25 km/h)
75 mph (120.7 km/h)82.05 mph (132.05 km/h)
80 mph (128.75 km/h)87.52 mph (140.85 km/h)
85 mph (136.79 km/h)92.99 mph (149.66 km/h)
90 mph (144.84 km/h)98.46 mph (158.46 km/h)
95 mph (152.89 km/h)103.93 mph (167.26 km/h)
100 mph (160.93 km/h)109.4 mph (176.07 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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