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 205/60r15 Tire Comparison Side By Side
  125/90-15 205/60-15 Difference
Diameter inches (mm) 23.86 (606) 24.69 (627) 0.83 (21) 3.5%
Width inches (mm) 4.92 (125) 8.07 (205) 3.15 (80) 64%
Circum. inches (mm) 74.95 (1903.81) 77.55 (1969.78) 2.6 (65.97) 3.5%
Sidewall Height inches (mm) 4.43 (112.5) 4.84 (123) 0.41 (10.5) 9.3%
Revolutions per mile (km) 845.33 (525.26) 817.02 (507.67) -28.31 (-17.59) -3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.69 mph (33.3 km/h)
25 mph (40.23 km/h)25.87 mph (41.63 km/h)
30 mph (48.28 km/h)31.04 mph (49.95 km/h)
35 mph (56.33 km/h)36.21 mph (58.28 km/h)
40 mph (64.37 km/h)41.39 mph (66.6 km/h)
45 mph (72.42 km/h)46.56 mph (74.93 km/h)
50 mph (80.47 km/h)51.73 mph (83.26 km/h)
55 mph (88.51 km/h)56.91 mph (91.58 km/h)
60 mph (96.56 km/h)62.08 mph (99.91 km/h)
65 mph (104.61 km/h)67.25 mph (108.23 km/h)
70 mph (112.65 km/h)72.43 mph (116.56 km/h)
75 mph (120.7 km/h)77.6 mph (124.88 km/h)
80 mph (128.75 km/h)82.77 mph (133.21 km/h)
85 mph (136.79 km/h)87.95 mph (141.53 km/h)
90 mph (144.84 km/h)93.12 mph (149.86 km/h)
95 mph (152.89 km/h)98.29 mph (158.19 km/h)
100 mph (160.93 km/h)103.47 mph (166.51 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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