Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r15 vs 205/75r15 Tire Comparison Side By Side
  245/75-15 205/75-15 Difference
Diameter inches (mm) 29.47 (748.5) 27.11 (688.5) -2.36 (-60) -8%
Width inches (mm) 9.65 (245) 8.07 (205) -1.57 (-40) -16.3%
Circum. inches (mm) 92.58 (2351.48) 85.16 (2162.99) -7.42 (-188.5) -8%
Sidewall Height inches (mm) 7.23 (183.75) 6.05 (153.75) -1.18 (-30) -16.3%
Revolutions per mile (km) 684.4 (425.26) 744.04 (462.32) 59.64 (37.06) 8.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.4 mph (29.61 km/h)
25 mph (40.23 km/h)23 mph (37.01 km/h)
30 mph (48.28 km/h)27.6 mph (44.41 km/h)
35 mph (56.33 km/h)32.19 mph (51.81 km/h)
40 mph (64.37 km/h)36.79 mph (59.21 km/h)
45 mph (72.42 km/h)41.39 mph (66.62 km/h)
50 mph (80.47 km/h)45.99 mph (74.02 km/h)
55 mph (88.51 km/h)50.59 mph (81.42 km/h)
60 mph (96.56 km/h)55.19 mph (88.82 km/h)
65 mph (104.61 km/h)59.79 mph (96.22 km/h)
70 mph (112.65 km/h)64.39 mph (103.62 km/h)
75 mph (120.7 km/h)68.99 mph (111.03 km/h)
80 mph (128.75 km/h)73.59 mph (118.43 km/h)
85 mph (136.79 km/h)78.19 mph (125.83 km/h)
90 mph (144.84 km/h)82.79 mph (133.23 km/h)
95 mph (152.89 km/h)87.38 mph (140.63 km/h)
100 mph (160.93 km/h)91.98 mph (148.03 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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