Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
80/90r21 vs 130/60r21 Tire Comparison Side By Side
  80/90-21 130/60-21 Difference
Diameter inches (mm) 26.67 (677.4) 27.14 (689.4) 0.47 (12) 1.8%
Width inches (mm) 3.15 (80) 5.12 (130) 1.97 (50) 62.5%
Circum. inches (mm) 83.78 (2128.11) 85.27 (2165.81) 1.48 (37.7) 1.8%
Sidewall Height inches (mm) 2.83 (72) 3.07 (78) 0.24 (6) 8.3%
Revolutions per mile (km) 756.23 (469.9) 743.07 (461.72) -13.16 (-8.18) -1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.35 mph (32.76 km/h)
25 mph (40.23 km/h)25.44 mph (40.95 km/h)
30 mph (48.28 km/h)30.53 mph (49.14 km/h)
35 mph (56.33 km/h)35.62 mph (57.32 km/h)
40 mph (64.37 km/h)40.71 mph (65.51 km/h)
45 mph (72.42 km/h)45.8 mph (73.7 km/h)
50 mph (80.47 km/h)50.89 mph (81.89 km/h)
55 mph (88.51 km/h)55.97 mph (90.08 km/h)
60 mph (96.56 km/h)61.06 mph (98.27 km/h)
65 mph (104.61 km/h)66.15 mph (106.46 km/h)
70 mph (112.65 km/h)71.24 mph (114.65 km/h)
75 mph (120.7 km/h)76.33 mph (122.84 km/h)
80 mph (128.75 km/h)81.42 mph (131.03 km/h)
85 mph (136.79 km/h)86.51 mph (139.22 km/h)
90 mph (144.84 km/h)91.59 mph (147.41 km/h)
95 mph (152.89 km/h)96.68 mph (155.6 km/h)
100 mph (160.93 km/h)101.77 mph (163.79 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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