Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r17 vs 235/65r17 Tire Comparison Side By Side
  245/75-17 235/65-17 Difference
Diameter inches (mm) 31.47 (799.3) 29.03 (737.3) -2.44 (-62) -7.8%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 98.86 (2511.08) 91.19 (2316.3) -7.67 (-194.78) -7.8%
Sidewall Height inches (mm) 7.23 (183.75) 6.01 (152.75) -1.22 (-31) -16.9%
Revolutions per mile (km) 640.9 (398.24) 694.79 (431.72) 53.89 (33.49) 8.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.45 mph (29.69 km/h)
25 mph (40.23 km/h)23.06 mph (37.11 km/h)
30 mph (48.28 km/h)27.67 mph (44.54 km/h)
35 mph (56.33 km/h)32.29 mph (51.96 km/h)
40 mph (64.37 km/h)36.9 mph (59.38 km/h)
45 mph (72.42 km/h)41.51 mph (66.8 km/h)
50 mph (80.47 km/h)46.12 mph (74.23 km/h)
55 mph (88.51 km/h)50.73 mph (81.65 km/h)
60 mph (96.56 km/h)55.35 mph (89.07 km/h)
65 mph (104.61 km/h)59.96 mph (96.49 km/h)
70 mph (112.65 km/h)64.57 mph (103.92 km/h)
75 mph (120.7 km/h)69.18 mph (111.34 km/h)
80 mph (128.75 km/h)73.79 mph (118.76 km/h)
85 mph (136.79 km/h)78.41 mph (126.18 km/h)
90 mph (144.84 km/h)83.02 mph (133.61 km/h)
95 mph (152.89 km/h)87.63 mph (141.03 km/h)
100 mph (160.93 km/h)92.24 mph (148.45 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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