Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r16 vs 235/45r17 Tire Comparison Side By Side
  225/45-16 235/45-17 Difference
Diameter inches (mm) 23.97 (608.9) 25.33 (643.3) 1.35 (34.4) 5.6%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 75.31 (1912.92) 79.57 (2020.99) 4.25 (108.07) 5.6%
Sidewall Height inches (mm) 3.99 (101.25) 4.16 (105.75) 0.18 (4.5) 4.4%
Revolutions per mile (km) 841.3 (522.76) 796.32 (494.81) -44.99 (-27.95) -5.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.13 mph (34.01 km/h)
25 mph (40.23 km/h)26.41 mph (42.51 km/h)
30 mph (48.28 km/h)31.69 mph (51.01 km/h)
35 mph (56.33 km/h)36.98 mph (59.51 km/h)
40 mph (64.37 km/h)42.26 mph (68.01 km/h)
45 mph (72.42 km/h)47.54 mph (76.51 km/h)
50 mph (80.47 km/h)52.82 mph (85.01 km/h)
55 mph (88.51 km/h)58.11 mph (93.51 km/h)
60 mph (96.56 km/h)63.39 mph (102.02 km/h)
65 mph (104.61 km/h)68.67 mph (110.52 km/h)
70 mph (112.65 km/h)73.95 mph (119.02 km/h)
75 mph (120.7 km/h)79.24 mph (127.52 km/h)
80 mph (128.75 km/h)84.52 mph (136.02 km/h)
85 mph (136.79 km/h)89.8 mph (144.52 km/h)
90 mph (144.84 km/h)95.08 mph (153.02 km/h)
95 mph (152.89 km/h)100.37 mph (161.53 km/h)
100 mph (160.93 km/h)105.65 mph (170.03 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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