Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
190/60r17 vs 180/55r17 Tire Comparison Side By Side
  190/60-17 180/55-17 Difference
Diameter inches (mm) 25.98 (659.8) 24.8 (629.8) -1.18 (-30) -4.5%
Width inches (mm) 7.48 (190) 7.09 (180) -0.39 (-10) -5.3%
Circum. inches (mm) 81.61 (2072.82) 77.9 (1978.58) -3.71 (-94.25) -4.5%
Sidewall Height inches (mm) 4.49 (114) 3.9 (99) -0.59 (-15) -13.2%
Revolutions per mile (km) 776.4 (482.43) 813.39 (505.41) 36.98 (22.98) 4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.09 mph (30.72 km/h)
25 mph (40.23 km/h)23.86 mph (38.4 km/h)
30 mph (48.28 km/h)28.64 mph (46.09 km/h)
35 mph (56.33 km/h)33.41 mph (53.77 km/h)
40 mph (64.37 km/h)38.18 mph (61.45 km/h)
45 mph (72.42 km/h)42.95 mph (69.13 km/h)
50 mph (80.47 km/h)47.73 mph (76.81 km/h)
55 mph (88.51 km/h)52.5 mph (84.49 km/h)
60 mph (96.56 km/h)57.27 mph (92.17 km/h)
65 mph (104.61 km/h)62.04 mph (99.85 km/h)
70 mph (112.65 km/h)66.82 mph (107.53 km/h)
75 mph (120.7 km/h)71.59 mph (115.21 km/h)
80 mph (128.75 km/h)76.36 mph (122.89 km/h)
85 mph (136.79 km/h)81.14 mph (130.57 km/h)
90 mph (144.84 km/h)85.91 mph (138.26 km/h)
95 mph (152.89 km/h)90.68 mph (145.94 km/h)
100 mph (160.93 km/h)95.45 mph (153.62 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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