Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/80r14 vs 110/70r14 Tire Comparison Side By Side
  120/80-14 110/70-14 Difference
Diameter inches (mm) 21.56 (547.6) 20.06 (509.6) -1.5 (-38) -6.9%
Width inches (mm) 4.72 (120) 4.33 (110) -0.39 (-10) -8.3%
Circum. inches (mm) 67.73 (1720.34) 63.03 (1600.96) -4.7 (-119.38) -6.9%
Sidewall Height inches (mm) 3.78 (96) 3.03 (77) -0.75 (-19) -19.8%
Revolutions per mile (km) 935.48 (581.28) 1005.24 (624.63) 69.76 (43.35) 7.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.61 mph (29.95 km/h)
25 mph (40.23 km/h)23.27 mph (37.44 km/h)
30 mph (48.28 km/h)27.92 mph (44.93 km/h)
35 mph (56.33 km/h)32.57 mph (52.42 km/h)
40 mph (64.37 km/h)37.22 mph (59.91 km/h)
45 mph (72.42 km/h)41.88 mph (67.4 km/h)
50 mph (80.47 km/h)46.53 mph (74.88 km/h)
55 mph (88.51 km/h)51.18 mph (82.37 km/h)
60 mph (96.56 km/h)55.84 mph (89.86 km/h)
65 mph (104.61 km/h)60.49 mph (97.35 km/h)
70 mph (112.65 km/h)65.14 mph (104.84 km/h)
75 mph (120.7 km/h)69.8 mph (112.33 km/h)
80 mph (128.75 km/h)74.45 mph (119.81 km/h)
85 mph (136.79 km/h)79.1 mph (127.3 km/h)
90 mph (144.84 km/h)83.75 mph (134.79 km/h)
95 mph (152.89 km/h)88.41 mph (142.28 km/h)
100 mph (160.93 km/h)93.06 mph (149.77 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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