Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/70r15 vs 235/70r15 Tire Comparison Side By Side
  225/70-15 235/70-15 Difference
Diameter inches (mm) 27.4 (696) 27.95 (710) 0.55 (14) 2%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 86.08 (2186.55) 87.82 (2230.53) 1.73 (43.98) 2%
Sidewall Height inches (mm) 6.2 (157.5) 6.48 (164.5) 0.28 (7) 4.4%
Revolutions per mile (km) 736.02 (457.34) 721.51 (448.32) -14.51 (-9.02) -2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.4 mph (32.83 km/h)
25 mph (40.23 km/h)25.5 mph (41.04 km/h)
30 mph (48.28 km/h)30.6 mph (49.25 km/h)
35 mph (56.33 km/h)35.7 mph (57.46 km/h)
40 mph (64.37 km/h)40.8 mph (65.67 km/h)
45 mph (72.42 km/h)45.91 mph (73.88 km/h)
50 mph (80.47 km/h)51.01 mph (82.09 km/h)
55 mph (88.51 km/h)56.11 mph (90.29 km/h)
60 mph (96.56 km/h)61.21 mph (98.5 km/h)
65 mph (104.61 km/h)66.31 mph (106.71 km/h)
70 mph (112.65 km/h)71.41 mph (114.92 km/h)
75 mph (120.7 km/h)76.51 mph (123.13 km/h)
80 mph (128.75 km/h)81.61 mph (131.34 km/h)
85 mph (136.79 km/h)86.71 mph (139.55 km/h)
90 mph (144.84 km/h)91.81 mph (147.75 km/h)
95 mph (152.89 km/h)96.91 mph (155.96 km/h)
100 mph (160.93 km/h)102.01 mph (164.17 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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