Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/55r16 vs 175/40r15 Tire Comparison Side By Side
  175/55-16 175/40-15 Difference
Diameter inches (mm) 23.58 (598.9) 20.51 (521) -3.07 (-77.9) -13%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 74.07 (1881.5) 64.44 (1636.77) -9.64 (-244.73) -13%
Sidewall Height inches (mm) 3.79 (96.25) 2.76 (70) -1.03 (-26.25) -27.3%
Revolutions per mile (km) 855.35 (531.49) 983.24 (610.96) 127.89 (79.47) 15%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.4 mph (28 km/h)
25 mph (40.23 km/h)21.75 mph (35 km/h)
30 mph (48.28 km/h)26.1 mph (42 km/h)
35 mph (56.33 km/h)30.45 mph (49 km/h)
40 mph (64.37 km/h)34.8 mph (56 km/h)
45 mph (72.42 km/h)39.15 mph (63 km/h)
50 mph (80.47 km/h)43.5 mph (70 km/h)
55 mph (88.51 km/h)47.85 mph (77 km/h)
60 mph (96.56 km/h)52.2 mph (84 km/h)
65 mph (104.61 km/h)56.55 mph (91 km/h)
70 mph (112.65 km/h)60.89 mph (98 km/h)
75 mph (120.7 km/h)65.24 mph (105 km/h)
80 mph (128.75 km/h)69.59 mph (112 km/h)
85 mph (136.79 km/h)73.94 mph (119 km/h)
90 mph (144.84 km/h)78.29 mph (126 km/h)
95 mph (152.89 km/h)82.64 mph (133 km/h)
100 mph (160.93 km/h)86.99 mph (140 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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