Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/55r15 vs 175/60r15 Tire Comparison Side By Side
  175/55-15 175/60-15 Difference
Diameter inches (mm) 22.58 (573.5) 23.27 (591) 0.69 (17.5) 3.1%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 70.93 (1801.7) 73.1 (1856.68) 2.16 (54.98) 3.1%
Sidewall Height inches (mm) 3.79 (96.25) 4.13 (105) 0.34 (8.75) 9.1%
Revolutions per mile (km) 893.23 (555.03) 866.79 (538.59) -26.45 (-16.43) -3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.61 mph (33.17 km/h)
25 mph (40.23 km/h)25.76 mph (41.46 km/h)
30 mph (48.28 km/h)30.92 mph (49.75 km/h)
35 mph (56.33 km/h)36.07 mph (58.05 km/h)
40 mph (64.37 km/h)41.22 mph (66.34 km/h)
45 mph (72.42 km/h)46.37 mph (74.63 km/h)
50 mph (80.47 km/h)51.53 mph (82.92 km/h)
55 mph (88.51 km/h)56.68 mph (91.22 km/h)
60 mph (96.56 km/h)61.83 mph (99.51 km/h)
65 mph (104.61 km/h)66.98 mph (107.8 km/h)
70 mph (112.65 km/h)72.14 mph (116.09 km/h)
75 mph (120.7 km/h)77.29 mph (124.38 km/h)
80 mph (128.75 km/h)82.44 mph (132.68 km/h)
85 mph (136.79 km/h)87.59 mph (140.97 km/h)
90 mph (144.84 km/h)92.75 mph (149.26 km/h)
95 mph (152.89 km/h)97.9 mph (157.55 km/h)
100 mph (160.93 km/h)103.05 mph (165.85 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
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