Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
240/40r19 vs 235/45r19 Tire Comparison Side By Side
  240/40-19 235/45-19 Difference
Diameter inches (mm) 26.56 (674.6) 27.33 (694.1) 0.77 (19.5) 2.9%
Width inches (mm) 9.45 (240) 9.25 (235) -0.2 (-5) -2.1%
Circum. inches (mm) 83.44 (2119.32) 85.85 (2180.58) 2.41 (61.26) 2.9%
Sidewall Height inches (mm) 3.78 (96) 4.16 (105.75) 0.38 (9.75) 10.2%
Revolutions per mile (km) 759.37 (471.85) 738.04 (458.59) -21.33 (-13.26) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.58 mph (33.12 km/h)
25 mph (40.23 km/h)25.72 mph (41.4 km/h)
30 mph (48.28 km/h)30.87 mph (49.68 km/h)
35 mph (56.33 km/h)36.01 mph (57.96 km/h)
40 mph (64.37 km/h)41.16 mph (66.23 km/h)
45 mph (72.42 km/h)46.3 mph (74.51 km/h)
50 mph (80.47 km/h)51.45 mph (82.79 km/h)
55 mph (88.51 km/h)56.59 mph (91.07 km/h)
60 mph (96.56 km/h)61.73 mph (99.35 km/h)
65 mph (104.61 km/h)66.88 mph (107.63 km/h)
70 mph (112.65 km/h)72.02 mph (115.91 km/h)
75 mph (120.7 km/h)77.17 mph (124.19 km/h)
80 mph (128.75 km/h)82.31 mph (132.47 km/h)
85 mph (136.79 km/h)87.46 mph (140.75 km/h)
90 mph (144.84 km/h)92.6 mph (149.03 km/h)
95 mph (152.89 km/h)97.75 mph (157.31 km/h)
100 mph (160.93 km/h)102.89 mph (165.59 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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