Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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295/45r18 vs 275/40r18 Tire Comparison Side By Side
  295/45-18 275/40-18 Difference
Diameter inches (mm) 28.45 (722.7) 26.66 (677.2) -1.79 (-45.5) -6.3%
Width inches (mm) 11.61 (295) 10.83 (275) -0.79 (-20) -6.8%
Circum. inches (mm) 89.39 (2270.43) 83.76 (2127.49) -5.63 (-142.94) -6.3%
Sidewall Height inches (mm) 5.23 (132.75) 4.33 (110) -0.9 (-22.75) -17.1%
Revolutions per mile (km) 708.83 (440.44) 756.45 (470.04) 47.63 (29.59) 6.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.74 mph (30.16 km/h)
25 mph (40.23 km/h)23.43 mph (37.7 km/h)
30 mph (48.28 km/h)28.11 mph (45.24 km/h)
35 mph (56.33 km/h)32.8 mph (52.78 km/h)
40 mph (64.37 km/h)37.48 mph (60.32 km/h)
45 mph (72.42 km/h)42.17 mph (67.86 km/h)
50 mph (80.47 km/h)46.85 mph (75.4 km/h)
55 mph (88.51 km/h)51.54 mph (82.94 km/h)
60 mph (96.56 km/h)56.22 mph (90.48 km/h)
65 mph (104.61 km/h)60.91 mph (98.02 km/h)
70 mph (112.65 km/h)65.59 mph (105.56 km/h)
75 mph (120.7 km/h)70.28 mph (113.1 km/h)
80 mph (128.75 km/h)74.96 mph (120.64 km/h)
85 mph (136.79 km/h)79.65 mph (128.18 km/h)
90 mph (144.84 km/h)84.33 mph (135.72 km/h)
95 mph (152.89 km/h)89.02 mph (143.26 km/h)
100 mph (160.93 km/h)93.7 mph (150.8 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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