Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/60r14 vs 225/60r15 Tire Comparison Side By Side
  235/60-14 225/60-15 Difference
Diameter inches (mm) 25.1 (637.6) 25.63 (651) 0.53 (13.4) 2.1%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 78.86 (2003.08) 80.52 (2045.18) 1.66 (42.1) 2.1%
Sidewall Height inches (mm) 5.55 (141) 5.31 (135) -0.24 (-6) -4.3%
Revolutions per mile (km) 803.43 (499.23) 786.9 (488.95) -16.54 (-10.28) -2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.42 mph (32.86 km/h)
25 mph (40.23 km/h)25.53 mph (41.08 km/h)
30 mph (48.28 km/h)30.63 mph (49.3 km/h)
35 mph (56.33 km/h)35.74 mph (57.51 km/h)
40 mph (64.37 km/h)40.84 mph (65.73 km/h)
45 mph (72.42 km/h)45.95 mph (73.94 km/h)
50 mph (80.47 km/h)51.05 mph (82.16 km/h)
55 mph (88.51 km/h)56.16 mph (90.37 km/h)
60 mph (96.56 km/h)61.26 mph (98.59 km/h)
65 mph (104.61 km/h)66.37 mph (106.81 km/h)
70 mph (112.65 km/h)71.47 mph (115.02 km/h)
75 mph (120.7 km/h)76.58 mph (123.24 km/h)
80 mph (128.75 km/h)81.68 mph (131.45 km/h)
85 mph (136.79 km/h)86.79 mph (139.67 km/h)
90 mph (144.84 km/h)91.89 mph (147.89 km/h)
95 mph (152.89 km/h)97 mph (156.1 km/h)
100 mph (160.93 km/h)102.1 mph (164.32 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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