Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/45r18 vs 225/45r18 Tire Comparison Side By Side
  265/45-18 225/45-18 Difference
Diameter inches (mm) 27.39 (695.7) 25.97 (659.7) -1.42 (-36) -5.2%
Width inches (mm) 10.43 (265) 8.86 (225) -1.57 (-40) -15.1%
Circum. inches (mm) 86.05 (2185.61) 81.59 (2072.51) -4.45 (-113.1) -5.2%
Sidewall Height inches (mm) 4.69 (119.25) 3.99 (101.25) -0.71 (-18) -15.1%
Revolutions per mile (km) 736.34 (457.54) 776.52 (482.51) 40.18 (24.97) 5.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.97 mph (30.52 km/h)
25 mph (40.23 km/h)23.71 mph (38.15 km/h)
30 mph (48.28 km/h)28.45 mph (45.78 km/h)
35 mph (56.33 km/h)33.19 mph (53.41 km/h)
40 mph (64.37 km/h)37.93 mph (61.04 km/h)
45 mph (72.42 km/h)42.67 mph (68.67 km/h)
50 mph (80.47 km/h)47.41 mph (76.3 km/h)
55 mph (88.51 km/h)52.15 mph (83.93 km/h)
60 mph (96.56 km/h)56.9 mph (91.56 km/h)
65 mph (104.61 km/h)61.64 mph (99.19 km/h)
70 mph (112.65 km/h)66.38 mph (106.82 km/h)
75 mph (120.7 km/h)71.12 mph (114.46 km/h)
80 mph (128.75 km/h)75.86 mph (122.09 km/h)
85 mph (136.79 km/h)80.6 mph (129.72 km/h)
90 mph (144.84 km/h)85.34 mph (137.35 km/h)
95 mph (152.89 km/h)90.08 mph (144.98 km/h)
100 mph (160.93 km/h)94.83 mph (152.61 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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