Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
160/60r15 vs 120/70r15 Tire Comparison Side By Side
  160/60-15 120/70-15 Difference
Diameter inches (mm) 22.56 (573) 21.61 (549) -0.94 (-24) -4.2%
Width inches (mm) 6.3 (160) 4.72 (120) -1.57 (-40) -25%
Circum. inches (mm) 70.87 (1800.13) 67.9 (1724.73) -2.97 (-75.4) -4.2%
Sidewall Height inches (mm) 3.78 (96) 3.31 (84) -0.47 (-12) -12.5%
Revolutions per mile (km) 894.01 (555.51) 933.1 (579.8) 39.08 (24.28) 4.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.16 mph (30.84 km/h)
25 mph (40.23 km/h)23.95 mph (38.55 km/h)
30 mph (48.28 km/h)28.74 mph (46.26 km/h)
35 mph (56.33 km/h)33.53 mph (53.97 km/h)
40 mph (64.37 km/h)38.32 mph (61.68 km/h)
45 mph (72.42 km/h)43.12 mph (69.39 km/h)
50 mph (80.47 km/h)47.91 mph (77.1 km/h)
55 mph (88.51 km/h)52.7 mph (84.81 km/h)
60 mph (96.56 km/h)57.49 mph (92.52 km/h)
65 mph (104.61 km/h)62.28 mph (100.23 km/h)
70 mph (112.65 km/h)67.07 mph (107.94 km/h)
75 mph (120.7 km/h)71.86 mph (115.65 km/h)
80 mph (128.75 km/h)76.65 mph (123.36 km/h)
85 mph (136.79 km/h)81.44 mph (131.06 km/h)
90 mph (144.84 km/h)86.23 mph (138.77 km/h)
95 mph (152.89 km/h)91.02 mph (146.48 km/h)
100 mph (160.93 km/h)95.81 mph (154.19 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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