Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
100/90r14 vs 140/70r14 Tire Comparison Side By Side
  100/90-14 140/70-14 Difference
Diameter inches (mm) 21.09 (535.6) 21.72 (551.6) 0.63 (16) 3%
Width inches (mm) 3.94 (100) 5.51 (140) 1.57 (40) 40%
Circum. inches (mm) 66.25 (1682.64) 68.22 (1732.9) 1.98 (50.27) 3%
Sidewall Height inches (mm) 3.54 (90) 3.86 (98) 0.31 (8) 8.9%
Revolutions per mile (km) 956.44 (594.3) 928.7 (577.07) -27.74 (-17.24) -2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.6 mph (33.15 km/h)
25 mph (40.23 km/h)25.75 mph (41.44 km/h)
30 mph (48.28 km/h)30.9 mph (49.72 km/h)
35 mph (56.33 km/h)36.05 mph (58.01 km/h)
40 mph (64.37 km/h)41.19 mph (66.3 km/h)
45 mph (72.42 km/h)46.34 mph (74.58 km/h)
50 mph (80.47 km/h)51.49 mph (82.87 km/h)
55 mph (88.51 km/h)56.64 mph (91.16 km/h)
60 mph (96.56 km/h)61.79 mph (99.45 km/h)
65 mph (104.61 km/h)66.94 mph (107.73 km/h)
70 mph (112.65 km/h)72.09 mph (116.02 km/h)
75 mph (120.7 km/h)77.24 mph (124.31 km/h)
80 mph (128.75 km/h)82.39 mph (132.59 km/h)
85 mph (136.79 km/h)87.54 mph (140.88 km/h)
90 mph (144.84 km/h)92.69 mph (149.17 km/h)
95 mph (152.89 km/h)97.84 mph (157.46 km/h)
100 mph (160.93 km/h)102.99 mph (165.74 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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