Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
130/80r17 vs 120/90r17 Tire Comparison Side By Side
  130/80-17 120/90-17 Difference
Diameter inches (mm) 25.19 (639.8) 25.5 (647.8) 0.31 (8) 1.3%
Width inches (mm) 5.12 (130) 4.72 (120) -0.39 (-10) -7.7%
Circum. inches (mm) 79.13 (2009.99) 80.12 (2035.12) 0.99 (25.13) 1.3%
Sidewall Height inches (mm) 4.09 (104) 4.25 (108) 0.16 (4) 3.8%
Revolutions per mile (km) 800.67 (497.51) 790.78 (491.37) -9.89 (-6.14) -1.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.25 mph (32.59 km/h)
25 mph (40.23 km/h)25.31 mph (40.74 km/h)
30 mph (48.28 km/h)30.38 mph (48.88 km/h)
35 mph (56.33 km/h)35.44 mph (57.03 km/h)
40 mph (64.37 km/h)40.5 mph (65.18 km/h)
45 mph (72.42 km/h)45.56 mph (73.33 km/h)
50 mph (80.47 km/h)50.63 mph (81.47 km/h)
55 mph (88.51 km/h)55.69 mph (89.62 km/h)
60 mph (96.56 km/h)60.75 mph (97.77 km/h)
65 mph (104.61 km/h)65.81 mph (105.92 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
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