Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/70r19 vs 180/55r17 Tire Comparison Side By Side
  120/70-19 180/55-17 Difference
Diameter inches (mm) 25.61 (650.6) 24.8 (629.8) -0.82 (-20.8) -3.2%
Width inches (mm) 4.72 (120) 7.09 (180) 2.36 (60) 50%
Circum. inches (mm) 80.47 (2043.92) 77.9 (1978.58) -2.57 (-65.35) -3.2%
Sidewall Height inches (mm) 3.31 (84) 3.9 (99) 0.59 (15) 17.9%
Revolutions per mile (km) 787.38 (489.25) 813.39 (505.41) 26 (16.16) 3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.36 mph (31.16 km/h)
25 mph (40.23 km/h)24.2 mph (38.95 km/h)
30 mph (48.28 km/h)29.04 mph (46.74 km/h)
35 mph (56.33 km/h)33.88 mph (54.53 km/h)
40 mph (64.37 km/h)38.72 mph (62.32 km/h)
45 mph (72.42 km/h)43.56 mph (70.11 km/h)
50 mph (80.47 km/h)48.4 mph (77.89 km/h)
55 mph (88.51 km/h)53.24 mph (85.68 km/h)
60 mph (96.56 km/h)58.08 mph (93.47 km/h)
65 mph (104.61 km/h)62.92 mph (101.26 km/h)
70 mph (112.65 km/h)67.76 mph (109.05 km/h)
75 mph (120.7 km/h)72.6 mph (116.84 km/h)
80 mph (128.75 km/h)77.44 mph (124.63 km/h)
85 mph (136.79 km/h)82.28 mph (132.42 km/h)
90 mph (144.84 km/h)87.12 mph (140.21 km/h)
95 mph (152.89 km/h)91.96 mph (148 km/h)
100 mph (160.93 km/h)96.8 mph (155.79 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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