Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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275/35r18 vs 285/35r19 Tire Comparison Side By Side
  275/35-18 285/35-19 Difference
Diameter inches (mm) 25.58 (649.7) 26.85 (682.1) 1.28 (32.4) 5%
Width inches (mm) 10.83 (275) 11.22 (285) 0.39 (10) 3.6%
Circum. inches (mm) 80.36 (2041.09) 84.37 (2142.88) 4.01 (101.79) 5%
Sidewall Height inches (mm) 3.79 (96.25) 3.93 (99.75) 0.14 (3.5) 3.6%
Revolutions per mile (km) 788.47 (489.93) 751.02 (466.66) -37.45 (-23.27) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21 mph (33.79 km/h)
25 mph (40.23 km/h)26.25 mph (42.24 km/h)
30 mph (48.28 km/h)31.5 mph (50.69 km/h)
35 mph (56.33 km/h)36.75 mph (59.14 km/h)
40 mph (64.37 km/h)41.99 mph (67.58 km/h)
45 mph (72.42 km/h)47.24 mph (76.03 km/h)
50 mph (80.47 km/h)52.49 mph (84.48 km/h)
55 mph (88.51 km/h)57.74 mph (92.93 km/h)
60 mph (96.56 km/h)62.99 mph (101.38 km/h)
65 mph (104.61 km/h)68.24 mph (109.82 km/h)
70 mph (112.65 km/h)73.49 mph (118.27 km/h)
75 mph (120.7 km/h)78.74 mph (126.72 km/h)
80 mph (128.75 km/h)83.99 mph (135.17 km/h)
85 mph (136.79 km/h)89.24 mph (143.62 km/h)
90 mph (144.84 km/h)94.49 mph (152.06 km/h)
95 mph (152.89 km/h)99.74 mph (160.51 km/h)
100 mph (160.93 km/h)104.99 mph (168.96 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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