Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/55r17 vs 180/60r17 Tire Comparison Side By Side
  180/55-17 180/60-17 Difference
Diameter inches (mm) 24.8 (629.8) 25.5 (647.8) 0.71 (18) 2.9%
Width inches (mm) 7.09 (180) 7.09 (180) 0 (0) 0%
Circum. inches (mm) 77.9 (1978.58) 80.12 (2035.12) 2.23 (56.55) 2.9%
Sidewall Height inches (mm) 3.9 (99) 4.25 (108) 0.35 (9) 9.1%
Revolutions per mile (km) 813.39 (505.41) 790.78 (491.37) -22.6 (-14.04) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.57 mph (33.11 km/h)
25 mph (40.23 km/h)25.71 mph (41.38 km/h)
30 mph (48.28 km/h)30.86 mph (49.66 km/h)
35 mph (56.33 km/h)36 mph (57.94 km/h)
40 mph (64.37 km/h)41.14 mph (66.21 km/h)
45 mph (72.42 km/h)46.29 mph (74.49 km/h)
50 mph (80.47 km/h)51.43 mph (82.77 km/h)
55 mph (88.51 km/h)56.57 mph (91.04 km/h)
60 mph (96.56 km/h)61.71 mph (99.32 km/h)
65 mph (104.61 km/h)66.86 mph (107.6 km/h)
70 mph (112.65 km/h)72 mph (115.87 km/h)
75 mph (120.7 km/h)77.14 mph (124.15 km/h)
80 mph (128.75 km/h)82.29 mph (132.43 km/h)
85 mph (136.79 km/h)87.43 mph (140.7 km/h)
90 mph (144.84 km/h)92.57 mph (148.98 km/h)
95 mph (152.89 km/h)97.72 mph (157.26 km/h)
100 mph (160.93 km/h)102.86 mph (165.53 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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