Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
120/90r19 vs 100/90r19 Tire Comparison Side By Side
  120/90-19 100/90-19 Difference
Diameter inches (mm) 27.5 (698.6) 26.09 (662.6) -1.42 (-36) -5.2%
Width inches (mm) 4.72 (120) 3.94 (100) -0.79 (-20) -16.7%
Circum. inches (mm) 86.41 (2194.72) 81.95 (2081.62) -4.45 (-113.1) -5.2%
Sidewall Height inches (mm) 4.25 (108) 3.54 (90) -0.71 (-18) -16.7%
Revolutions per mile (km) 733.28 (455.64) 773.12 (480.39) 39.84 (24.76) 5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.97 mph (30.53 km/h)
25 mph (40.23 km/h)23.71 mph (38.16 km/h)
30 mph (48.28 km/h)28.45 mph (45.79 km/h)
35 mph (56.33 km/h)33.2 mph (53.42 km/h)
40 mph (64.37 km/h)37.94 mph (61.06 km/h)
45 mph (72.42 km/h)42.68 mph (68.69 km/h)
50 mph (80.47 km/h)47.42 mph (76.32 km/h)
55 mph (88.51 km/h)52.17 mph (83.95 km/h)
60 mph (96.56 km/h)56.91 mph (91.58 km/h)
65 mph (104.61 km/h)61.65 mph (99.22 km/h)
70 mph (112.65 km/h)66.39 mph (106.85 km/h)
75 mph (120.7 km/h)71.14 mph (114.48 km/h)
80 mph (128.75 km/h)75.88 mph (122.11 km/h)
85 mph (136.79 km/h)80.62 mph (129.75 km/h)
90 mph (144.84 km/h)85.36 mph (137.38 km/h)
95 mph (152.89 km/h)90.1 mph (145.01 km/h)
100 mph (160.93 km/h)94.85 mph (152.64 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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