Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
115/70r14 vs 120/80r14 Tire Comparison Side By Side
  115/70-14 120/80-14 Difference
Diameter inches (mm) 20.34 (516.6) 21.56 (547.6) 1.22 (31) 6%
Width inches (mm) 4.53 (115) 4.72 (120) 0.2 (5) 4.3%
Circum. inches (mm) 63.9 (1622.95) 67.73 (1720.34) 3.83 (97.39) 6%
Sidewall Height inches (mm) 3.17 (80.5) 3.78 (96) 0.61 (15.5) 19.3%
Revolutions per mile (km) 991.62 (616.16) 935.48 (581.28) -56.14 (-34.88) -5.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.2 mph (34.12 km/h)
25 mph (40.23 km/h)26.5 mph (42.65 km/h)
30 mph (48.28 km/h)31.8 mph (51.18 km/h)
35 mph (56.33 km/h)37.1 mph (59.71 km/h)
40 mph (64.37 km/h)42.4 mph (68.24 km/h)
45 mph (72.42 km/h)47.7 mph (76.77 km/h)
50 mph (80.47 km/h)53 mph (85.3 km/h)
55 mph (88.51 km/h)58.3 mph (93.83 km/h)
60 mph (96.56 km/h)63.6 mph (102.36 km/h)
65 mph (104.61 km/h)68.9 mph (110.88 km/h)
70 mph (112.65 km/h)74.2 mph (119.41 km/h)
75 mph (120.7 km/h)79.5 mph (127.94 km/h)
80 mph (128.75 km/h)84.8 mph (136.47 km/h)
85 mph (136.79 km/h)90.1 mph (145 km/h)
90 mph (144.84 km/h)95.4 mph (153.53 km/h)
95 mph (152.89 km/h)100.7 mph (162.06 km/h)
100 mph (160.93 km/h)106 mph (170.59 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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