Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/60r15 vs 275/50r15 Tire Comparison Side By Side
  275/60-15 275/50-15 Difference
Diameter inches (mm) 27.99 (711) 25.83 (656) -2.17 (-55) -7.7%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 87.94 (2233.67) 81.14 (2060.88) -6.8 (-172.79) -7.7%
Sidewall Height inches (mm) 6.5 (165) 5.41 (137.5) -1.08 (-27.5) -16.7%
Revolutions per mile (km) 720.49 (447.69) 780.9 (485.23) 60.41 (37.54) 8.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.45 mph (29.7 km/h)
25 mph (40.23 km/h)23.07 mph (37.12 km/h)
30 mph (48.28 km/h)27.68 mph (44.55 km/h)
35 mph (56.33 km/h)32.29 mph (51.97 km/h)
40 mph (64.37 km/h)36.91 mph (59.39 km/h)
45 mph (72.42 km/h)41.52 mph (66.82 km/h)
50 mph (80.47 km/h)46.13 mph (74.24 km/h)
55 mph (88.51 km/h)50.75 mph (81.67 km/h)
60 mph (96.56 km/h)55.36 mph (89.09 km/h)
65 mph (104.61 km/h)59.97 mph (96.52 km/h)
70 mph (112.65 km/h)64.59 mph (103.94 km/h)
75 mph (120.7 km/h)69.2 mph (111.36 km/h)
80 mph (128.75 km/h)73.81 mph (118.79 km/h)
85 mph (136.79 km/h)78.42 mph (126.21 km/h)
90 mph (144.84 km/h)83.04 mph (133.64 km/h)
95 mph (152.89 km/h)87.65 mph (141.06 km/h)
100 mph (160.93 km/h)92.26 mph (148.49 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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