Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/75r17 vs 165/80r17 Tire Comparison Side By Side
  165/75-17 165/80-17 Difference
Diameter inches (mm) 26.74 (679.3) 27.39 (695.8) 0.65 (16.5) 2.4%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 84.02 (2134.08) 86.06 (2185.92) 2.04 (51.84) 2.4%
Sidewall Height inches (mm) 4.87 (123.75) 5.2 (132) 0.32 (8.25) 6.7%
Revolutions per mile (km) 754.11 (468.58) 736.23 (457.47) -17.88 (-11.11) -2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.49 mph (32.97 km/h)
25 mph (40.23 km/h)25.61 mph (41.21 km/h)
30 mph (48.28 km/h)30.73 mph (49.45 km/h)
35 mph (56.33 km/h)35.85 mph (57.7 km/h)
40 mph (64.37 km/h)40.97 mph (65.94 km/h)
45 mph (72.42 km/h)46.09 mph (74.18 km/h)
50 mph (80.47 km/h)51.21 mph (82.42 km/h)
55 mph (88.51 km/h)56.34 mph (90.66 km/h)
60 mph (96.56 km/h)61.46 mph (98.91 km/h)
65 mph (104.61 km/h)66.58 mph (107.15 km/h)
70 mph (112.65 km/h)71.7 mph (115.39 km/h)
75 mph (120.7 km/h)76.82 mph (123.63 km/h)
80 mph (128.75 km/h)81.94 mph (131.88 km/h)
85 mph (136.79 km/h)87.06 mph (140.12 km/h)
90 mph (144.84 km/h)92.19 mph (148.36 km/h)
95 mph (152.89 km/h)97.31 mph (156.6 km/h)
100 mph (160.93 km/h)102.43 mph (164.84 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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