Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r15 vs 275/60r15 Tire Comparison Side By Side
  235/55-15 275/60-15 Difference
Diameter inches (mm) 25.18 (639.5) 27.99 (711) 2.81 (71.5) 11.2%
Width inches (mm) 9.25 (235) 10.83 (275) 1.57 (40) 17%
Circum. inches (mm) 79.1 (2009.05) 87.94 (2233.67) 8.84 (224.62) 11.2%
Sidewall Height inches (mm) 5.09 (129.25) 6.5 (165) 1.41 (35.75) 27.7%
Revolutions per mile (km) 801.05 (497.75) 720.49 (447.69) -80.56 (-50.05) -10.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.24 mph (35.79 km/h)
25 mph (40.23 km/h)27.8 mph (44.73 km/h)
30 mph (48.28 km/h)33.35 mph (53.68 km/h)
35 mph (56.33 km/h)38.91 mph (62.62 km/h)
40 mph (64.37 km/h)44.47 mph (71.57 km/h)
45 mph (72.42 km/h)50.03 mph (80.52 km/h)
50 mph (80.47 km/h)55.59 mph (89.46 km/h)
55 mph (88.51 km/h)61.15 mph (98.41 km/h)
60 mph (96.56 km/h)66.71 mph (107.36 km/h)
65 mph (104.61 km/h)72.27 mph (116.3 km/h)
70 mph (112.65 km/h)77.83 mph (125.25 km/h)
75 mph (120.7 km/h)83.39 mph (134.2 km/h)
80 mph (128.75 km/h)88.94 mph (143.14 km/h)
85 mph (136.79 km/h)94.5 mph (152.09 km/h)
90 mph (144.84 km/h)100.06 mph (161.04 km/h)
95 mph (152.89 km/h)105.62 mph (169.98 km/h)
100 mph (160.93 km/h)111.18 mph (178.93 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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