Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/85r15 vs 235/75r15 Tire Comparison Side By Side
  235/85-15 235/75-15 Difference
Diameter inches (mm) 30.73 (780.5) 28.88 (733.5) -1.85 (-47) -6%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 96.54 (2452.01) 90.72 (2304.36) -5.81 (-147.65) -6%
Sidewall Height inches (mm) 7.86 (199.75) 6.94 (176.25) -0.93 (-23.5) -11.8%
Revolutions per mile (km) 656.34 (407.83) 698.39 (433.96) 42.06 (26.13) 6.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.8 mph (30.25 km/h)
25 mph (40.23 km/h)23.49 mph (37.81 km/h)
30 mph (48.28 km/h)28.19 mph (45.37 km/h)
35 mph (56.33 km/h)32.89 mph (52.94 km/h)
40 mph (64.37 km/h)37.59 mph (60.5 km/h)
45 mph (72.42 km/h)42.29 mph (68.06 km/h)
50 mph (80.47 km/h)46.99 mph (75.62 km/h)
55 mph (88.51 km/h)51.69 mph (83.18 km/h)
60 mph (96.56 km/h)56.39 mph (90.75 km/h)
65 mph (104.61 km/h)61.09 mph (98.31 km/h)
70 mph (112.65 km/h)65.78 mph (105.87 km/h)
75 mph (120.7 km/h)70.48 mph (113.43 km/h)
80 mph (128.75 km/h)75.18 mph (120.99 km/h)
85 mph (136.79 km/h)79.88 mph (128.56 km/h)
90 mph (144.84 km/h)84.58 mph (136.12 km/h)
95 mph (152.89 km/h)89.28 mph (143.68 km/h)
100 mph (160.93 km/h)93.98 mph (151.24 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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