Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/75r15 vs 225/75r15 Tire Comparison Side By Side
  235/75-15 225/75-15 Difference
Diameter inches (mm) 28.88 (733.5) 28.29 (718.5) -0.59 (-15) -2%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 90.72 (2304.36) 88.87 (2257.23) -1.86 (-47.12) -2%
Sidewall Height inches (mm) 6.94 (176.25) 6.64 (168.75) -0.3 (-7.5) -4.3%
Revolutions per mile (km) 698.39 (433.96) 712.97 (443.02) 14.58 (9.06) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.59 mph (31.53 km/h)
25 mph (40.23 km/h)24.49 mph (39.41 km/h)
30 mph (48.28 km/h)29.39 mph (47.29 km/h)
35 mph (56.33 km/h)34.28 mph (55.18 km/h)
40 mph (64.37 km/h)39.18 mph (63.06 km/h)
45 mph (72.42 km/h)44.08 mph (70.94 km/h)
50 mph (80.47 km/h)48.98 mph (78.82 km/h)
55 mph (88.51 km/h)53.88 mph (86.7 km/h)
60 mph (96.56 km/h)58.77 mph (94.59 km/h)
65 mph (104.61 km/h)63.67 mph (102.47 km/h)
70 mph (112.65 km/h)68.57 mph (110.35 km/h)
75 mph (120.7 km/h)73.47 mph (118.23 km/h)
80 mph (128.75 km/h)78.36 mph (126.11 km/h)
85 mph (136.79 km/h)83.26 mph (134 km/h)
90 mph (144.84 km/h)88.16 mph (141.88 km/h)
95 mph (152.89 km/h)93.06 mph (149.76 km/h)
100 mph (160.93 km/h)97.96 mph (157.64 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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