Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
140/70r14 vs 120/80r14 Tire Comparison Side By Side
  140/70-14 120/80-14 Difference
Diameter inches (mm) 21.72 (551.6) 21.56 (547.6) -0.16 (-4) -0.7%
Width inches (mm) 5.51 (140) 4.72 (120) -0.79 (-20) -14.3%
Circum. inches (mm) 68.22 (1732.9) 67.73 (1720.34) -0.49 (-12.57) -0.7%
Sidewall Height inches (mm) 3.86 (98) 3.78 (96) -0.08 (-2) -2%
Revolutions per mile (km) 928.7 (577.07) 935.48 (581.28) 6.78 (4.22) 0.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.85 mph (31.95 km/h)
25 mph (40.23 km/h)24.82 mph (39.94 km/h)
30 mph (48.28 km/h)29.78 mph (47.93 km/h)
35 mph (56.33 km/h)34.75 mph (55.92 km/h)
40 mph (64.37 km/h)39.71 mph (63.91 km/h)
45 mph (72.42 km/h)44.67 mph (71.9 km/h)
50 mph (80.47 km/h)49.64 mph (79.88 km/h)
55 mph (88.51 km/h)54.6 mph (87.87 km/h)
60 mph (96.56 km/h)59.56 mph (95.86 km/h)
65 mph (104.61 km/h)64.53 mph (103.85 km/h)
70 mph (112.65 km/h)69.49 mph (111.84 km/h)
75 mph (120.7 km/h)74.46 mph (119.83 km/h)
80 mph (128.75 km/h)79.42 mph (127.81 km/h)
85 mph (136.79 km/h)84.38 mph (135.8 km/h)
90 mph (144.84 km/h)89.35 mph (143.79 km/h)
95 mph (152.89 km/h)94.31 mph (151.78 km/h)
100 mph (160.93 km/h)99.27 mph (159.77 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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