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 155/90r17 Tire Comparison Side By Side
  125/70-19 155/90-17 Difference
Diameter inches (mm) 25.89 (657.6) 27.98 (710.8) 2.09 (53.2) 8.1%
Width inches (mm) 4.92 (125) 6.1 (155) 1.18 (30) 24%
Circum. inches (mm) 81.34 (2065.91) 87.92 (2233.04) 6.58 (167.13) 8.1%
Sidewall Height inches (mm) 3.44 (87.5) 5.49 (139.5) 2.05 (52) 59.4%
Revolutions per mile (km) 779 (484.05) 720.7 (447.82) -58.3 (-36.23) -7.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.62 mph (34.79 km/h)
25 mph (40.23 km/h)27.02 mph (43.49 km/h)
30 mph (48.28 km/h)32.43 mph (52.19 km/h)
35 mph (56.33 km/h)37.83 mph (60.88 km/h)
40 mph (64.37 km/h)43.24 mph (69.58 km/h)
45 mph (72.42 km/h)48.64 mph (78.28 km/h)
50 mph (80.47 km/h)54.05 mph (86.98 km/h)
55 mph (88.51 km/h)59.45 mph (95.67 km/h)
60 mph (96.56 km/h)64.85 mph (104.37 km/h)
65 mph (104.61 km/h)70.26 mph (113.07 km/h)
70 mph (112.65 km/h)75.66 mph (121.77 km/h)
75 mph (120.7 km/h)81.07 mph (130.47 km/h)
80 mph (128.75 km/h)86.47 mph (139.16 km/h)
85 mph (136.79 km/h)91.88 mph (147.86 km/h)
90 mph (144.84 km/h)97.28 mph (156.56 km/h)
95 mph (152.89 km/h)102.69 mph (165.26 km/h)
100 mph (160.93 km/h)108.09 mph (173.95 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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