Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/55r15 vs 105/55r15 Tire Comparison Side By Side
  155/55-15 105/55-15 Difference
Diameter inches (mm) 21.71 (551.5) 19.55 (496.5) -2.17 (-55) -10%
Width inches (mm) 6.1 (155) 4.13 (105) -1.97 (-50) -32.3%
Circum. inches (mm) 68.21 (1732.59) 61.41 (1559.8) -6.8 (-172.79) -10%
Sidewall Height inches (mm) 3.36 (85.25) 2.27 (57.75) -1.08 (-27.5) -32.3%
Revolutions per mile (km) 928.87 (577.17) 1031.76 (641.11) 102.9 (63.94) 11.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.01 mph (28.98 km/h)
25 mph (40.23 km/h)22.51 mph (36.22 km/h)
30 mph (48.28 km/h)27.01 mph (43.47 km/h)
35 mph (56.33 km/h)31.51 mph (50.71 km/h)
40 mph (64.37 km/h)36.01 mph (57.95 km/h)
45 mph (72.42 km/h)40.51 mph (65.2 km/h)
50 mph (80.47 km/h)45.01 mph (72.44 km/h)
55 mph (88.51 km/h)49.51 mph (79.69 km/h)
60 mph (96.56 km/h)54.02 mph (86.93 km/h)
65 mph (104.61 km/h)58.52 mph (94.18 km/h)
70 mph (112.65 km/h)63.02 mph (101.42 km/h)
75 mph (120.7 km/h)67.52 mph (108.66 km/h)
80 mph (128.75 km/h)72.02 mph (115.91 km/h)
85 mph (136.79 km/h)76.52 mph (123.15 km/h)
90 mph (144.84 km/h)81.02 mph (130.4 km/h)
95 mph (152.89 km/h)85.53 mph (137.64 km/h)
100 mph (160.93 km/h)90.03 mph (144.89 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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