Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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175/70r12 vs 205/60r12 Tire Comparison Side By Side
  175/70-12 205/60-12 Difference
Diameter inches (mm) 21.65 (549.8) 21.69 (550.8) 0.04 (1) 0.2%
Width inches (mm) 6.89 (175) 8.07 (205) 1.18 (30) 17.1%
Circum. inches (mm) 68 (1727.25) 68.13 (1730.39) 0.12 (3.14) 0.2%
Sidewall Height inches (mm) 4.82 (122.5) 4.84 (123) 0.02 (0.5) 0.4%
Revolutions per mile (km) 931.74 (578.95) 930.05 (577.9) -1.69 (-1.05) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.04 mph (32.25 km/h)
25 mph (40.23 km/h)25.05 mph (40.31 km/h)
30 mph (48.28 km/h)30.05 mph (48.37 km/h)
35 mph (56.33 km/h)35.06 mph (56.43 km/h)
40 mph (64.37 km/h)40.07 mph (64.49 km/h)
45 mph (72.42 km/h)45.08 mph (72.55 km/h)
50 mph (80.47 km/h)50.09 mph (80.61 km/h)
55 mph (88.51 km/h)55.1 mph (88.68 km/h)
60 mph (96.56 km/h)60.11 mph (96.74 km/h)
65 mph (104.61 km/h)65.12 mph (104.8 km/h)
70 mph (112.65 km/h)70.13 mph (112.86 km/h)
75 mph (120.7 km/h)75.14 mph (120.92 km/h)
80 mph (128.75 km/h)80.15 mph (128.98 km/h)
85 mph (136.79 km/h)85.15 mph (137.04 km/h)
90 mph (144.84 km/h)90.16 mph (145.1 km/h)
95 mph (152.89 km/h)95.17 mph (153.17 km/h)
100 mph (160.93 km/h)100.18 mph (161.23 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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