Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/50r15 vs 235/60r15 Tire Comparison Side By Side
  245/50-15 235/60-15 Difference
Diameter inches (mm) 24.65 (626) 26.1 (663) 1.46 (37) 5.9%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 77.43 (1966.64) 82 (2082.88) 4.58 (116.24) 5.9%
Sidewall Height inches (mm) 4.82 (122.5) 5.55 (141) 0.73 (18.5) 15.1%
Revolutions per mile (km) 818.32 (508.48) 772.65 (480.1) -45.67 (-28.38) -5.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.18 mph (34.09 km/h)
25 mph (40.23 km/h)26.48 mph (42.61 km/h)
30 mph (48.28 km/h)31.77 mph (51.13 km/h)
35 mph (56.33 km/h)37.07 mph (59.66 km/h)
40 mph (64.37 km/h)42.36 mph (68.18 km/h)
45 mph (72.42 km/h)47.66 mph (76.7 km/h)
50 mph (80.47 km/h)52.96 mph (85.22 km/h)
55 mph (88.51 km/h)58.25 mph (93.75 km/h)
60 mph (96.56 km/h)63.55 mph (102.27 km/h)
65 mph (104.61 km/h)68.84 mph (110.79 km/h)
70 mph (112.65 km/h)74.14 mph (119.31 km/h)
75 mph (120.7 km/h)79.43 mph (127.84 km/h)
80 mph (128.75 km/h)84.73 mph (136.36 km/h)
85 mph (136.79 km/h)90.02 mph (144.88 km/h)
90 mph (144.84 km/h)95.32 mph (153.4 km/h)
95 mph (152.89 km/h)100.62 mph (161.92 km/h)
100 mph (160.93 km/h)105.91 mph (170.45 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
19662284246025692686276928622970312132723439357338154083429244264501477851625999
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