Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
130/90r15 vs 120/90r15 Tire Comparison Side By Side
  130/90-15 120/90-15 Difference
Diameter inches (mm) 24.21 (615) 23.5 (597) -0.71 (-18) -2.9%
Width inches (mm) 5.12 (130) 4.72 (120) -0.39 (-10) -7.7%
Circum. inches (mm) 76.07 (1932.08) 73.84 (1875.53) -2.23 (-56.55) -2.9%
Sidewall Height inches (mm) 4.61 (117) 4.25 (108) -0.35 (-9) -7.7%
Revolutions per mile (km) 832.96 (517.58) 858.07 (533.18) 25.11 (15.61) 3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.41 mph (31.24 km/h)
25 mph (40.23 km/h)24.27 mph (39.06 km/h)
30 mph (48.28 km/h)29.12 mph (46.87 km/h)
35 mph (56.33 km/h)33.98 mph (54.68 km/h)
40 mph (64.37 km/h)38.83 mph (62.49 km/h)
45 mph (72.42 km/h)43.68 mph (70.3 km/h)
50 mph (80.47 km/h)48.54 mph (78.11 km/h)
55 mph (88.51 km/h)53.39 mph (85.92 km/h)
60 mph (96.56 km/h)58.24 mph (93.73 km/h)
65 mph (104.61 km/h)63.1 mph (101.55 km/h)
70 mph (112.65 km/h)67.95 mph (109.36 km/h)
75 mph (120.7 km/h)72.8 mph (117.17 km/h)
80 mph (128.75 km/h)77.66 mph (124.98 km/h)
85 mph (136.79 km/h)82.51 mph (132.79 km/h)
90 mph (144.84 km/h)87.37 mph (140.6 km/h)
95 mph (152.89 km/h)92.22 mph (148.41 km/h)
100 mph (160.93 km/h)97.07 mph (156.22 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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