Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/65r15 vs 235/60r15 Tire Comparison Side By Side
  205/65-15 235/60-15 Difference
Diameter inches (mm) 25.49 (647.5) 26.1 (663) 0.61 (15.5) 2.4%
Width inches (mm) 8.07 (205) 9.25 (235) 1.18 (30) 14.6%
Circum. inches (mm) 80.09 (2034.18) 82 (2082.88) 1.92 (48.69) 2.4%
Sidewall Height inches (mm) 5.25 (133.25) 5.55 (141) 0.31 (7.75) 5.8%
Revolutions per mile (km) 791.15 (491.6) 772.65 (480.1) -18.5 (-11.49) -2.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.48 mph (32.96 km/h)
25 mph (40.23 km/h)25.6 mph (41.2 km/h)
30 mph (48.28 km/h)30.72 mph (49.44 km/h)
35 mph (56.33 km/h)35.84 mph (57.68 km/h)
40 mph (64.37 km/h)40.96 mph (65.91 km/h)
45 mph (72.42 km/h)46.08 mph (74.15 km/h)
50 mph (80.47 km/h)51.2 mph (82.39 km/h)
55 mph (88.51 km/h)56.32 mph (90.63 km/h)
60 mph (96.56 km/h)61.44 mph (98.87 km/h)
65 mph (104.61 km/h)66.56 mph (107.11 km/h)
70 mph (112.65 km/h)71.68 mph (115.35 km/h)
75 mph (120.7 km/h)76.8 mph (123.59 km/h)
80 mph (128.75 km/h)81.92 mph (131.83 km/h)
85 mph (136.79 km/h)87.03 mph (140.07 km/h)
90 mph (144.84 km/h)92.15 mph (148.31 km/h)
95 mph (152.89 km/h)97.27 mph (156.55 km/h)
100 mph (160.93 km/h)102.39 mph (164.79 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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