Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/90r17 vs 165/80r17 Tire Comparison Side By Side
  165/90-17 165/80-17 Difference
Diameter inches (mm) 28.69 (728.8) 27.39 (695.8) -1.3 (-33) -4.5%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 90.14 (2289.59) 86.06 (2185.92) -4.08 (-103.67) -4.5%
Sidewall Height inches (mm) 5.85 (148.5) 5.2 (132) -0.65 (-16.5) -11.1%
Revolutions per mile (km) 702.9 (436.76) 736.23 (457.47) 33.34 (20.71) 4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.09 mph (30.73 km/h)
25 mph (40.23 km/h)23.87 mph (38.41 km/h)
30 mph (48.28 km/h)28.64 mph (46.09 km/h)
35 mph (56.33 km/h)33.42 mph (53.78 km/h)
40 mph (64.37 km/h)38.19 mph (61.46 km/h)
45 mph (72.42 km/h)42.96 mph (69.14 km/h)
50 mph (80.47 km/h)47.74 mph (76.82 km/h)
55 mph (88.51 km/h)52.51 mph (84.51 km/h)
60 mph (96.56 km/h)57.28 mph (92.19 km/h)
65 mph (104.61 km/h)62.06 mph (99.87 km/h)
70 mph (112.65 km/h)66.83 mph (107.55 km/h)
75 mph (120.7 km/h)71.6 mph (115.24 km/h)
80 mph (128.75 km/h)76.38 mph (122.92 km/h)
85 mph (136.79 km/h)81.15 mph (130.6 km/h)
90 mph (144.84 km/h)85.92 mph (138.28 km/h)
95 mph (152.89 km/h)90.7 mph (145.97 km/h)
100 mph (160.93 km/h)95.47 mph (153.65 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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