Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/65r17 vs 235/55r17 Tire Comparison Side By Side
  235/65-17 235/55-17 Difference
Diameter inches (mm) 29.03 (737.3) 27.18 (690.3) -1.85 (-47) -6.4%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 91.19 (2316.3) 85.38 (2168.64) -5.81 (-147.65) -6.4%
Sidewall Height inches (mm) 6.01 (152.75) 5.09 (129.25) -0.93 (-23.5) -15.4%
Revolutions per mile (km) 694.79 (431.72) 742.1 (461.12) 47.31 (29.39) 6.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.73 mph (30.14 km/h)
25 mph (40.23 km/h)23.41 mph (37.67 km/h)
30 mph (48.28 km/h)28.09 mph (45.2 km/h)
35 mph (56.33 km/h)32.77 mph (52.74 km/h)
40 mph (64.37 km/h)37.45 mph (60.27 km/h)
45 mph (72.42 km/h)42.13 mph (67.8 km/h)
50 mph (80.47 km/h)46.81 mph (75.34 km/h)
55 mph (88.51 km/h)51.49 mph (82.87 km/h)
60 mph (96.56 km/h)56.18 mph (90.41 km/h)
65 mph (104.61 km/h)60.86 mph (97.94 km/h)
70 mph (112.65 km/h)65.54 mph (105.47 km/h)
75 mph (120.7 km/h)70.22 mph (113.01 km/h)
80 mph (128.75 km/h)74.9 mph (120.54 km/h)
85 mph (136.79 km/h)79.58 mph (128.07 km/h)
90 mph (144.84 km/h)84.26 mph (135.61 km/h)
95 mph (152.89 km/h)88.94 mph (143.14 km/h)
100 mph (160.93 km/h)93.63 mph (150.68 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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