Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
110/80r14 vs 120/70r14 Tire Comparison Side By Side
  110/80-14 120/70-14 Difference
Diameter inches (mm) 20.93 (531.6) 20.61 (523.6) -0.31 (-8) -1.5%
Width inches (mm) 4.33 (110) 4.72 (120) 0.39 (10) 9.1%
Circum. inches (mm) 65.75 (1670.07) 64.76 (1644.94) -0.99 (-25.13) -1.5%
Sidewall Height inches (mm) 3.46 (88) 3.31 (84) -0.16 (-4) -4.5%
Revolutions per mile (km) 963.64 (598.78) 978.36 (607.92) 14.72 (9.15) 1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.7 mph (31.7 km/h)
25 mph (40.23 km/h)24.62 mph (39.63 km/h)
30 mph (48.28 km/h)29.55 mph (47.55 km/h)
35 mph (56.33 km/h)34.47 mph (55.48 km/h)
40 mph (64.37 km/h)39.4 mph (63.41 km/h)
45 mph (72.42 km/h)44.32 mph (71.33 km/h)
50 mph (80.47 km/h)49.25 mph (79.26 km/h)
55 mph (88.51 km/h)54.17 mph (87.18 km/h)
60 mph (96.56 km/h)59.1 mph (95.11 km/h)
65 mph (104.61 km/h)64.02 mph (103.03 km/h)
70 mph (112.65 km/h)68.95 mph (110.96 km/h)
75 mph (120.7 km/h)73.87 mph (118.88 km/h)
80 mph (128.75 km/h)78.8 mph (126.81 km/h)
85 mph (136.79 km/h)83.72 mph (134.74 km/h)
90 mph (144.84 km/h)88.65 mph (142.66 km/h)
95 mph (152.89 km/h)93.57 mph (150.59 km/h)
100 mph (160.93 km/h)98.5 mph (158.51 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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