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 205/45r16 Tire Comparison Side By Side
  125/90-15 205/45-16 Difference
Diameter inches (mm) 23.86 (606) 23.26 (590.9) -0.59 (-15.1) -2.5%
Width inches (mm) 4.92 (125) 8.07 (205) 3.15 (80) 64%
Circum. inches (mm) 74.95 (1903.81) 73.09 (1856.37) -1.87 (-47.44) -2.5%
Sidewall Height inches (mm) 4.43 (112.5) 3.63 (92.25) -0.8 (-20.25) -18%
Revolutions per mile (km) 845.33 (525.26) 866.93 (538.69) 21.6 (13.42) 2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.5 mph (31.38 km/h)
25 mph (40.23 km/h)24.38 mph (39.23 km/h)
30 mph (48.28 km/h)29.25 mph (47.08 km/h)
35 mph (56.33 km/h)34.13 mph (54.92 km/h)
40 mph (64.37 km/h)39 mph (62.77 km/h)
45 mph (72.42 km/h)43.88 mph (70.62 km/h)
50 mph (80.47 km/h)48.75 mph (78.46 km/h)
55 mph (88.51 km/h)53.63 mph (86.31 km/h)
60 mph (96.56 km/h)58.5 mph (94.15 km/h)
65 mph (104.61 km/h)63.38 mph (102 km/h)
70 mph (112.65 km/h)68.26 mph (109.85 km/h)
75 mph (120.7 km/h)73.13 mph (117.69 km/h)
80 mph (128.75 km/h)78.01 mph (125.54 km/h)
85 mph (136.79 km/h)82.88 mph (133.39 km/h)
90 mph (144.84 km/h)87.76 mph (141.23 km/h)
95 mph (152.89 km/h)92.63 mph (149.08 km/h)
100 mph (160.93 km/h)97.51 mph (156.92 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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