Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
80/80r14 vs 100/80r14 Tire Comparison Side By Side
  80/80-14 100/80-14 Difference
Diameter inches (mm) 19.04 (483.6) 20.3 (515.6) 1.26 (32) 6.6%
Width inches (mm) 3.15 (80) 3.94 (100) 0.79 (20) 25%
Circum. inches (mm) 59.81 (1519.27) 63.77 (1619.81) 3.96 (100.53) 6.6%
Sidewall Height inches (mm) 2.52 (64) 3.15 (80) 0.63 (16) 25%
Revolutions per mile (km) 1059.28 (658.21) 993.54 (617.36) -65.74 (-40.85) -6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.32 mph (34.32 km/h)
25 mph (40.23 km/h)26.65 mph (42.9 km/h)
30 mph (48.28 km/h)31.99 mph (51.48 km/h)
35 mph (56.33 km/h)37.32 mph (60.05 km/h)
40 mph (64.37 km/h)42.65 mph (68.63 km/h)
45 mph (72.42 km/h)47.98 mph (77.21 km/h)
50 mph (80.47 km/h)53.31 mph (85.79 km/h)
55 mph (88.51 km/h)58.64 mph (94.37 km/h)
60 mph (96.56 km/h)63.97 mph (102.95 km/h)
65 mph (104.61 km/h)69.3 mph (111.53 km/h)
70 mph (112.65 km/h)74.63 mph (120.11 km/h)
75 mph (120.7 km/h)79.96 mph (128.69 km/h)
80 mph (128.75 km/h)85.29 mph (137.27 km/h)
85 mph (136.79 km/h)90.62 mph (145.85 km/h)
90 mph (144.84 km/h)95.96 mph (154.43 km/h)
95 mph (152.89 km/h)101.29 mph (163 km/h)
100 mph (160.93 km/h)106.62 mph (171.58 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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