Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
130/90r17 vs 120/70r17 Tire Comparison Side By Side
  130/90-17 120/70-17 Difference
Diameter inches (mm) 26.21 (665.8) 23.61 (599.8) -2.6 (-66) -9.9%
Width inches (mm) 5.12 (130) 4.72 (120) -0.39 (-10) -7.7%
Circum. inches (mm) 82.35 (2091.67) 74.19 (1884.33) -8.16 (-207.35) -9.9%
Sidewall Height inches (mm) 4.61 (117) 3.31 (84) -1.3 (-33) -28.2%
Revolutions per mile (km) 769.41 (478.09) 854.07 (530.69) 84.66 (52.61) 11%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.02 mph (29 km/h)
25 mph (40.23 km/h)22.52 mph (36.25 km/h)
30 mph (48.28 km/h)27.03 mph (43.49 km/h)
35 mph (56.33 km/h)31.53 mph (50.74 km/h)
40 mph (64.37 km/h)36.03 mph (57.99 km/h)
45 mph (72.42 km/h)40.54 mph (65.24 km/h)
50 mph (80.47 km/h)45.04 mph (72.49 km/h)
55 mph (88.51 km/h)49.55 mph (79.74 km/h)
60 mph (96.56 km/h)54.05 mph (86.99 km/h)
65 mph (104.61 km/h)58.56 mph (94.24 km/h)
70 mph (112.65 km/h)63.06 mph (101.49 km/h)
75 mph (120.7 km/h)67.57 mph (108.74 km/h)
80 mph (128.75 km/h)72.07 mph (115.99 km/h)
85 mph (136.79 km/h)76.57 mph (123.23 km/h)
90 mph (144.84 km/h)81.08 mph (130.48 km/h)
95 mph (152.89 km/h)85.58 mph (137.73 km/h)
100 mph (160.93 km/h)90.09 mph (144.98 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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