Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/70r15 vs 110/70r15 Tire Comparison Side By Side
  120/70-15 110/70-15 Difference
Diameter inches (mm) 21.61 (549) 21.06 (535) -0.55 (-14) -2.6%
Width inches (mm) 4.72 (120) 4.33 (110) -0.39 (-10) -8.3%
Circum. inches (mm) 67.9 (1724.73) 66.17 (1680.75) -1.73 (-43.98) -2.6%
Sidewall Height inches (mm) 3.31 (84) 3.03 (77) -0.28 (-7) -8.3%
Revolutions per mile (km) 933.1 (579.8) 957.51 (594.97) 24.42 (15.17) 2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.49 mph (31.37 km/h)
25 mph (40.23 km/h)24.36 mph (39.21 km/h)
30 mph (48.28 km/h)29.23 mph (47.05 km/h)
35 mph (56.33 km/h)34.11 mph (54.89 km/h)
40 mph (64.37 km/h)38.98 mph (62.73 km/h)
45 mph (72.42 km/h)43.85 mph (70.57 km/h)
50 mph (80.47 km/h)48.72 mph (78.42 km/h)
55 mph (88.51 km/h)53.6 mph (86.26 km/h)
60 mph (96.56 km/h)58.47 mph (94.1 km/h)
65 mph (104.61 km/h)63.34 mph (101.94 km/h)
70 mph (112.65 km/h)68.21 mph (109.78 km/h)
75 mph (120.7 km/h)73.09 mph (117.62 km/h)
80 mph (128.75 km/h)77.96 mph (125.46 km/h)
85 mph (136.79 km/h)82.83 mph (133.31 km/h)
90 mph (144.84 km/h)87.7 mph (141.15 km/h)
95 mph (152.89 km/h)92.58 mph (148.99 km/h)
100 mph (160.93 km/h)97.45 mph (156.83 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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