Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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130/90r10 vs 120/70r12 Tire Comparison Side By Side
  130/90-10 120/70-12 Difference
Diameter inches (mm) 19.21 (488) 18.61 (472.8) -0.6 (-15.2) -3.1%
Width inches (mm) 5.12 (130) 4.72 (120) -0.39 (-10) -7.7%
Circum. inches (mm) 60.36 (1533.1) 58.48 (1485.35) -1.88 (-47.75) -3.1%
Sidewall Height inches (mm) 4.61 (117) 3.31 (84) -1.3 (-33) -28.2%
Revolutions per mile (km) 1049.73 (652.27) 1083.48 (673.24) 33.75 (20.97) 3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.38 mph (31.18 km/h)
25 mph (40.23 km/h)24.22 mph (38.98 km/h)
30 mph (48.28 km/h)29.07 mph (46.78 km/h)
35 mph (56.33 km/h)33.91 mph (54.57 km/h)
40 mph (64.37 km/h)38.75 mph (62.37 km/h)
45 mph (72.42 km/h)43.6 mph (70.16 km/h)
50 mph (80.47 km/h)48.44 mph (77.96 km/h)
55 mph (88.51 km/h)53.29 mph (85.76 km/h)
60 mph (96.56 km/h)58.13 mph (93.55 km/h)
65 mph (104.61 km/h)62.98 mph (101.35 km/h)
70 mph (112.65 km/h)67.82 mph (109.15 km/h)
75 mph (120.7 km/h)72.66 mph (116.94 km/h)
80 mph (128.75 km/h)77.51 mph (124.74 km/h)
85 mph (136.79 km/h)82.35 mph (132.53 km/h)
90 mph (144.84 km/h)87.2 mph (140.33 km/h)
95 mph (152.89 km/h)92.04 mph (148.13 km/h)
100 mph (160.93 km/h)96.89 mph (155.92 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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