Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
130/90r18 vs 100/90r18 Tire Comparison Side By Side
  130/90-18 100/90-18 Difference
Diameter inches (mm) 27.21 (691.2) 25.09 (637.2) -2.13 (-54) -7.8%
Width inches (mm) 5.12 (130) 3.94 (100) -1.18 (-30) -23.1%
Circum. inches (mm) 85.49 (2171.47) 78.81 (2001.82) -6.68 (-169.65) -7.8%
Sidewall Height inches (mm) 4.61 (117) 3.54 (90) -1.06 (-27) -23.1%
Revolutions per mile (km) 741.13 (460.52) 803.94 (499.54) 62.81 (39.03) 8.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.44 mph (29.67 km/h)
25 mph (40.23 km/h)23.05 mph (37.09 km/h)
30 mph (48.28 km/h)27.66 mph (44.51 km/h)
35 mph (56.33 km/h)32.27 mph (51.93 km/h)
40 mph (64.37 km/h)36.88 mph (59.34 km/h)
45 mph (72.42 km/h)41.48 mph (66.76 km/h)
50 mph (80.47 km/h)46.09 mph (74.18 km/h)
55 mph (88.51 km/h)50.7 mph (81.6 km/h)
60 mph (96.56 km/h)55.31 mph (89.02 km/h)
65 mph (104.61 km/h)59.92 mph (96.44 km/h)
70 mph (112.65 km/h)64.53 mph (103.85 km/h)
75 mph (120.7 km/h)69.14 mph (111.27 km/h)
80 mph (128.75 km/h)73.75 mph (118.69 km/h)
85 mph (136.79 km/h)78.36 mph (126.11 km/h)
90 mph (144.84 km/h)82.97 mph (133.53 km/h)
95 mph (152.89 km/h)87.58 mph (140.94 km/h)
100 mph (160.93 km/h)92.19 mph (148.36 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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