Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
90/70r14 vs 60/80r14 Tire Comparison Side By Side
  90/70-14 60/80-14 Difference
Diameter inches (mm) 18.96 (481.6) 17.78 (451.6) -1.18 (-30) -6.2%
Width inches (mm) 3.54 (90) 2.36 (60) -1.18 (-30) -33.3%
Circum. inches (mm) 59.57 (1512.99) 55.86 (1418.74) -3.71 (-94.25) -6.2%
Sidewall Height inches (mm) 2.48 (63) 1.89 (48) -0.59 (-15) -23.8%
Revolutions per mile (km) 1063.68 (660.94) 1134.34 (704.85) 70.66 (43.91) 6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.75 mph (30.18 km/h)
25 mph (40.23 km/h)23.44 mph (37.73 km/h)
30 mph (48.28 km/h)28.13 mph (45.27 km/h)
35 mph (56.33 km/h)32.82 mph (52.82 km/h)
40 mph (64.37 km/h)37.51 mph (60.36 km/h)
45 mph (72.42 km/h)42.2 mph (67.91 km/h)
50 mph (80.47 km/h)46.89 mph (75.45 km/h)
55 mph (88.51 km/h)51.57 mph (83 km/h)
60 mph (96.56 km/h)56.26 mph (90.55 km/h)
65 mph (104.61 km/h)60.95 mph (98.09 km/h)
70 mph (112.65 km/h)65.64 mph (105.64 km/h)
75 mph (120.7 km/h)70.33 mph (113.18 km/h)
80 mph (128.75 km/h)75.02 mph (120.73 km/h)
85 mph (136.79 km/h)79.71 mph (128.27 km/h)
90 mph (144.84 km/h)84.39 mph (135.82 km/h)
95 mph (152.89 km/h)89.08 mph (143.36 km/h)
100 mph (160.93 km/h)93.77 mph (150.91 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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