Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/50r18 vs 295/45r18 Tire Comparison Side By Side
  255/50-18 295/45-18 Difference
Diameter inches (mm) 28.04 (712.2) 28.45 (722.7) 0.41 (10.5) 1.5%
Width inches (mm) 10.04 (255) 11.61 (295) 1.57 (40) 15.7%
Circum. inches (mm) 88.09 (2237.44) 89.39 (2270.43) 1.3 (32.99) 1.5%
Sidewall Height inches (mm) 5.02 (127.5) 5.23 (132.75) 0.21 (5.25) 4.1%
Revolutions per mile (km) 719.28 (446.94) 708.83 (440.44) -10.45 (-6.49) -1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.29 mph (32.66 km/h)
25 mph (40.23 km/h)25.37 mph (40.83 km/h)
30 mph (48.28 km/h)30.44 mph (48.99 km/h)
35 mph (56.33 km/h)35.52 mph (57.16 km/h)
40 mph (64.37 km/h)40.59 mph (65.32 km/h)
45 mph (72.42 km/h)45.66 mph (73.49 km/h)
50 mph (80.47 km/h)50.74 mph (81.65 km/h)
55 mph (88.51 km/h)55.81 mph (89.82 km/h)
60 mph (96.56 km/h)60.88 mph (97.98 km/h)
65 mph (104.61 km/h)65.96 mph (106.15 km/h)
70 mph (112.65 km/h)71.03 mph (114.32 km/h)
75 mph (120.7 km/h)76.11 mph (122.48 km/h)
80 mph (128.75 km/h)81.18 mph (130.65 km/h)
85 mph (136.79 km/h)86.25 mph (138.81 km/h)
90 mph (144.84 km/h)91.33 mph (146.98 km/h)
95 mph (152.89 km/h)96.4 mph (155.14 km/h)
100 mph (160.93 km/h)101.47 mph (163.31 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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