Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/70r12 vs 110/70r12 Tire Comparison Side By Side
  120/70-12 110/70-12 Difference
Diameter inches (mm) 18.61 (472.8) 18.06 (458.8) -0.55 (-14) -3%
Width inches (mm) 4.72 (120) 4.33 (110) -0.39 (-10) -8.3%
Circum. inches (mm) 58.48 (1485.35) 56.75 (1441.36) -1.73 (-43.98) -3%
Sidewall Height inches (mm) 3.31 (84) 3.03 (77) -0.28 (-7) -8.3%
Revolutions per mile (km) 1083.48 (673.24) 1116.54 (693.79) 33.06 (20.54) 3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.41 mph (31.23 km/h)
25 mph (40.23 km/h)24.26 mph (39.04 km/h)
30 mph (48.28 km/h)29.11 mph (46.85 km/h)
35 mph (56.33 km/h)33.96 mph (54.66 km/h)
40 mph (64.37 km/h)38.82 mph (62.47 km/h)
45 mph (72.42 km/h)43.67 mph (70.28 km/h)
50 mph (80.47 km/h)48.52 mph (78.08 km/h)
55 mph (88.51 km/h)53.37 mph (85.89 km/h)
60 mph (96.56 km/h)58.22 mph (93.7 km/h)
65 mph (104.61 km/h)63.08 mph (101.51 km/h)
70 mph (112.65 km/h)67.93 mph (109.32 km/h)
75 mph (120.7 km/h)72.78 mph (117.13 km/h)
80 mph (128.75 km/h)77.63 mph (124.94 km/h)
85 mph (136.79 km/h)82.48 mph (132.74 km/h)
90 mph (144.84 km/h)87.34 mph (140.55 km/h)
95 mph (152.89 km/h)92.19 mph (148.36 km/h)
100 mph (160.93 km/h)97.04 mph (156.17 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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