Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/40r19 vs 275/40r20 Tire Comparison Side By Side
  275/40-19 275/40-20 Difference
Diameter inches (mm) 27.66 (702.6) 28.66 (728) 1 (25.4) 3.6%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 86.9 (2207.28) 90.04 (2287.08) 3.14 (79.8) 3.6%
Sidewall Height inches (mm) 4.33 (110) 4.33 (110) 0 (0) 0%
Revolutions per mile (km) 729.11 (453.04) 703.67 (437.24) -25.44 (-15.81) -3.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.72 mph (33.35 km/h)
25 mph (40.23 km/h)25.9 mph (41.69 km/h)
30 mph (48.28 km/h)31.08 mph (50.03 km/h)
35 mph (56.33 km/h)36.27 mph (58.36 km/h)
40 mph (64.37 km/h)41.45 mph (66.7 km/h)
45 mph (72.42 km/h)46.63 mph (75.04 km/h)
50 mph (80.47 km/h)51.81 mph (83.38 km/h)
55 mph (88.51 km/h)56.99 mph (91.71 km/h)
60 mph (96.56 km/h)62.17 mph (100.05 km/h)
65 mph (104.61 km/h)67.35 mph (108.39 km/h)
70 mph (112.65 km/h)72.53 mph (116.73 km/h)
75 mph (120.7 km/h)77.71 mph (125.06 km/h)
80 mph (128.75 km/h)82.89 mph (133.4 km/h)
85 mph (136.79 km/h)88.07 mph (141.74 km/h)
90 mph (144.84 km/h)93.25 mph (150.08 km/h)
95 mph (152.89 km/h)98.43 mph (158.42 km/h)
100 mph (160.93 km/h)103.62 mph (166.75 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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