Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/90r15 vs 205/55r16 Tire Comparison Side By Side
  125/90-15 205/55-16 Difference
Diameter inches (mm) 23.86 (606) 24.88 (631.9) 1.02 (25.9) 4.3%
Width inches (mm) 4.92 (125) 8.07 (205) 3.15 (80) 64%
Circum. inches (mm) 74.95 (1903.81) 78.16 (1985.17) 3.2 (81.37) 4.3%
Sidewall Height inches (mm) 4.43 (112.5) 4.44 (112.75) 0.01 (0.25) 0.2%
Revolutions per mile (km) 845.33 (525.26) 810.68 (503.73) -34.65 (-21.53) -4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.85 mph (33.56 km/h)
25 mph (40.23 km/h)26.07 mph (41.95 km/h)
30 mph (48.28 km/h)31.28 mph (50.34 km/h)
35 mph (56.33 km/h)36.5 mph (58.73 km/h)
40 mph (64.37 km/h)41.71 mph (67.13 km/h)
45 mph (72.42 km/h)46.92 mph (75.52 km/h)
50 mph (80.47 km/h)52.14 mph (83.91 km/h)
55 mph (88.51 km/h)57.35 mph (92.3 km/h)
60 mph (96.56 km/h)62.56 mph (100.69 km/h)
65 mph (104.61 km/h)67.78 mph (109.08 km/h)
70 mph (112.65 km/h)72.99 mph (117.47 km/h)
75 mph (120.7 km/h)78.21 mph (125.86 km/h)
80 mph (128.75 km/h)83.42 mph (134.25 km/h)
85 mph (136.79 km/h)88.63 mph (142.64 km/h)
90 mph (144.84 km/h)93.85 mph (151.03 km/h)
95 mph (152.89 km/h)99.06 mph (159.42 km/h)
100 mph (160.93 km/h)104.27 mph (167.81 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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