Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/35r18 vs 275/35r18 Tire Comparison Side By Side
  255/35-18 275/35-18 Difference
Diameter inches (mm) 25.03 (635.7) 25.58 (649.7) 0.55 (14) 2.2%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 78.63 (1997.11) 80.36 (2041.09) 1.73 (43.98) 2.2%
Sidewall Height inches (mm) 3.51 (89.25) 3.79 (96.25) 0.28 (7) 7.8%
Revolutions per mile (km) 805.84 (500.72) 788.47 (489.93) -17.36 (-10.79) -2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.44 mph (32.9 km/h)
25 mph (40.23 km/h)25.55 mph (41.12 km/h)
30 mph (48.28 km/h)30.66 mph (49.34 km/h)
35 mph (56.33 km/h)35.77 mph (57.57 km/h)
40 mph (64.37 km/h)40.88 mph (65.79 km/h)
45 mph (72.42 km/h)45.99 mph (74.02 km/h)
50 mph (80.47 km/h)51.1 mph (82.24 km/h)
55 mph (88.51 km/h)56.21 mph (90.46 km/h)
60 mph (96.56 km/h)61.32 mph (98.69 km/h)
65 mph (104.61 km/h)66.43 mph (106.91 km/h)
70 mph (112.65 km/h)71.54 mph (115.14 km/h)
75 mph (120.7 km/h)76.65 mph (123.36 km/h)
80 mph (128.75 km/h)81.76 mph (131.58 km/h)
85 mph (136.79 km/h)86.87 mph (139.81 km/h)
90 mph (144.84 km/h)91.98 mph (148.03 km/h)
95 mph (152.89 km/h)97.09 mph (156.26 km/h)
100 mph (160.93 km/h)102.2 mph (164.48 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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