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 195/55r16 Tire Comparison Side By Side
  125/90-15 195/55-16 Difference
Diameter inches (mm) 23.86 (606) 24.44 (620.9) 0.59 (14.9) 2.5%
Width inches (mm) 4.92 (125) 7.68 (195) 2.76 (70) 56%
Circum. inches (mm) 74.95 (1903.81) 76.8 (1950.61) 1.84 (46.81) 2.5%
Sidewall Height inches (mm) 4.43 (112.5) 4.22 (107.25) -0.21 (-5.25) -4.7%
Revolutions per mile (km) 845.33 (525.26) 825.04 (512.66) -20.29 (-12.6) -2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.49 mph (32.98 km/h)
25 mph (40.23 km/h)25.61 mph (41.22 km/h)
30 mph (48.28 km/h)30.74 mph (49.47 km/h)
35 mph (56.33 km/h)35.86 mph (57.71 km/h)
40 mph (64.37 km/h)40.98 mph (65.96 km/h)
45 mph (72.42 km/h)46.11 mph (74.2 km/h)
50 mph (80.47 km/h)51.23 mph (82.45 km/h)
55 mph (88.51 km/h)56.35 mph (90.69 km/h)
60 mph (96.56 km/h)61.48 mph (98.94 km/h)
65 mph (104.61 km/h)66.6 mph (107.18 km/h)
70 mph (112.65 km/h)71.72 mph (115.42 km/h)
75 mph (120.7 km/h)76.84 mph (123.67 km/h)
80 mph (128.75 km/h)81.97 mph (131.91 km/h)
85 mph (136.79 km/h)87.09 mph (140.16 km/h)
90 mph (144.84 km/h)92.21 mph (148.4 km/h)
95 mph (152.89 km/h)97.34 mph (156.65 km/h)
100 mph (160.93 km/h)102.46 mph (164.89 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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