Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/70r19 vs 125/90r19 Tire Comparison Side By Side
  125/70-19 125/90-19 Difference
Diameter inches (mm) 25.89 (657.6) 27.86 (707.6) 1.97 (50) 7.6%
Width inches (mm) 4.92 (125) 4.92 (125) 0 (0) 0%
Circum. inches (mm) 81.34 (2065.91) 87.52 (2222.99) 6.18 (157.08) 7.6%
Sidewall Height inches (mm) 3.44 (87.5) 4.43 (112.5) 0.98 (25) 28.6%
Revolutions per mile (km) 779 (484.05) 723.95 (449.84) -55.05 (-34.2) -7.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.52 mph (34.63 km/h)
25 mph (40.23 km/h)26.9 mph (43.29 km/h)
30 mph (48.28 km/h)32.28 mph (51.95 km/h)
35 mph (56.33 km/h)37.66 mph (60.61 km/h)
40 mph (64.37 km/h)43.04 mph (69.27 km/h)
45 mph (72.42 km/h)48.42 mph (77.93 km/h)
50 mph (80.47 km/h)53.8 mph (86.59 km/h)
55 mph (88.51 km/h)59.18 mph (95.24 km/h)
60 mph (96.56 km/h)64.56 mph (103.9 km/h)
65 mph (104.61 km/h)69.94 mph (112.56 km/h)
70 mph (112.65 km/h)75.32 mph (121.22 km/h)
75 mph (120.7 km/h)80.7 mph (129.88 km/h)
80 mph (128.75 km/h)86.08 mph (138.54 km/h)
85 mph (136.79 km/h)91.46 mph (147.2 km/h)
90 mph (144.84 km/h)96.84 mph (155.85 km/h)
95 mph (152.89 km/h)102.22 mph (164.51 km/h)
100 mph (160.93 km/h)107.6 mph (173.17 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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