Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/70r16 vs 205/55r16 Tire Comparison Side By Side
  125/70-16 205/55-16 Difference
Diameter inches (mm) 22.89 (581.4) 24.88 (631.9) 1.99 (50.5) 8.7%
Width inches (mm) 4.92 (125) 8.07 (205) 3.15 (80) 64%
Circum. inches (mm) 71.91 (1826.52) 78.16 (1985.17) 6.25 (158.65) 8.7%
Sidewall Height inches (mm) 3.44 (87.5) 4.44 (112.75) 0.99 (25.25) 28.9%
Revolutions per mile (km) 881.1 (547.49) 810.68 (503.73) -70.42 (-43.75) -8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.74 mph (34.98 km/h)
25 mph (40.23 km/h)27.17 mph (43.73 km/h)
30 mph (48.28 km/h)32.61 mph (52.47 km/h)
35 mph (56.33 km/h)38.04 mph (61.22 km/h)
40 mph (64.37 km/h)43.47 mph (69.97 km/h)
45 mph (72.42 km/h)48.91 mph (78.71 km/h)
50 mph (80.47 km/h)54.34 mph (87.46 km/h)
55 mph (88.51 km/h)59.78 mph (96.2 km/h)
60 mph (96.56 km/h)65.21 mph (104.95 km/h)
65 mph (104.61 km/h)70.65 mph (113.69 km/h)
70 mph (112.65 km/h)76.08 mph (122.44 km/h)
75 mph (120.7 km/h)81.51 mph (131.19 km/h)
80 mph (128.75 km/h)86.95 mph (139.93 km/h)
85 mph (136.79 km/h)92.38 mph (148.68 km/h)
90 mph (144.84 km/h)97.82 mph (157.42 km/h)
95 mph (152.89 km/h)103.25 mph (166.17 km/h)
100 mph (160.93 km/h)108.69 mph (174.91 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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