Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
130/60r21 vs 140/80r15 Tire Comparison Side By Side
  130/60-21 140/80-15 Difference
Diameter inches (mm) 27.14 (689.4) 23.82 (605) -3.32 (-84.4) -12.2%
Width inches (mm) 5.12 (130) 5.51 (140) 0.39 (10) 7.7%
Circum. inches (mm) 85.27 (2165.81) 74.83 (1900.66) -10.44 (-265.15) -12.2%
Sidewall Height inches (mm) 3.07 (78) 4.41 (112) 1.34 (34) 43.6%
Revolutions per mile (km) 743.07 (461.72) 846.73 (526.13) 103.66 (64.41) 14%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.55 mph (28.25 km/h)
25 mph (40.23 km/h)21.94 mph (35.31 km/h)
30 mph (48.28 km/h)26.33 mph (42.37 km/h)
35 mph (56.33 km/h)30.72 mph (49.43 km/h)
40 mph (64.37 km/h)35.1 mph (56.49 km/h)
45 mph (72.42 km/h)39.49 mph (63.55 km/h)
50 mph (80.47 km/h)43.88 mph (70.62 km/h)
55 mph (88.51 km/h)48.27 mph (77.68 km/h)
60 mph (96.56 km/h)52.65 mph (84.74 km/h)
65 mph (104.61 km/h)57.04 mph (91.8 km/h)
70 mph (112.65 km/h)61.43 mph (98.86 km/h)
75 mph (120.7 km/h)65.82 mph (105.92 km/h)
80 mph (128.75 km/h)70.21 mph (112.99 km/h)
85 mph (136.79 km/h)74.59 mph (120.05 km/h)
90 mph (144.84 km/h)78.98 mph (127.11 km/h)
95 mph (152.89 km/h)83.37 mph (134.17 km/h)
100 mph (160.93 km/h)87.76 mph (141.23 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
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