Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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130/60r21 vs 130/60r19 Tire Comparison Side By Side
  130/60-21 130/60-19 Difference
Diameter inches (mm) 27.14 (689.4) 25.14 (638.6) -2 (-50.8) -7.4%
Width inches (mm) 5.12 (130) 5.12 (130) 0 (0) 0%
Circum. inches (mm) 85.27 (2165.81) 78.99 (2006.22) -6.28 (-159.59) -7.4%
Sidewall Height inches (mm) 3.07 (78) 3.07 (78) 0 (0) 0%
Revolutions per mile (km) 743.07 (461.72) 802.18 (498.45) 59.11 (36.73) 8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.53 mph (29.82 km/h)
25 mph (40.23 km/h)23.16 mph (37.27 km/h)
30 mph (48.28 km/h)27.79 mph (44.72 km/h)
35 mph (56.33 km/h)32.42 mph (52.18 km/h)
40 mph (64.37 km/h)37.05 mph (59.63 km/h)
45 mph (72.42 km/h)41.68 mph (67.08 km/h)
50 mph (80.47 km/h)46.32 mph (74.54 km/h)
55 mph (88.51 km/h)50.95 mph (81.99 km/h)
60 mph (96.56 km/h)55.58 mph (89.45 km/h)
65 mph (104.61 km/h)60.21 mph (96.9 km/h)
70 mph (112.65 km/h)64.84 mph (104.35 km/h)
75 mph (120.7 km/h)69.47 mph (111.81 km/h)
80 mph (128.75 km/h)74.11 mph (119.26 km/h)
85 mph (136.79 km/h)78.74 mph (126.71 km/h)
90 mph (144.84 km/h)83.37 mph (134.17 km/h)
95 mph (152.89 km/h)88 mph (141.62 km/h)
100 mph (160.93 km/h)92.63 mph (149.08 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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