Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/50r15 vs 175/50r15 Tire Comparison Side By Side
  165/50-15 175/50-15 Difference
Diameter inches (mm) 21.5 (546) 21.89 (556) 0.39 (10) 1.8%
Width inches (mm) 6.5 (165) 6.89 (175) 0.39 (10) 6.1%
Circum. inches (mm) 67.53 (1715.31) 68.77 (1746.73) 1.24 (31.42) 1.8%
Sidewall Height inches (mm) 3.25 (82.5) 3.44 (87.5) 0.2 (5) 6.1%
Revolutions per mile (km) 938.22 (582.98) 921.35 (572.5) -16.87 (-10.49) -1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.37 mph (32.78 km/h)
25 mph (40.23 km/h)25.46 mph (40.97 km/h)
30 mph (48.28 km/h)30.55 mph (49.16 km/h)
35 mph (56.33 km/h)35.64 mph (57.36 km/h)
40 mph (64.37 km/h)40.73 mph (65.55 km/h)
45 mph (72.42 km/h)45.82 mph (73.75 km/h)
50 mph (80.47 km/h)50.92 mph (81.94 km/h)
55 mph (88.51 km/h)56.01 mph (90.14 km/h)
60 mph (96.56 km/h)61.1 mph (98.33 km/h)
65 mph (104.61 km/h)66.19 mph (106.52 km/h)
70 mph (112.65 km/h)71.28 mph (114.72 km/h)
75 mph (120.7 km/h)76.37 mph (122.91 km/h)
80 mph (128.75 km/h)81.47 mph (131.11 km/h)
85 mph (136.79 km/h)86.56 mph (139.3 km/h)
90 mph (144.84 km/h)91.65 mph (147.49 km/h)
95 mph (152.89 km/h)96.74 mph (155.69 km/h)
100 mph (160.93 km/h)101.83 mph (163.88 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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