Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/70r12 vs 165/70r12 Tire Comparison Side By Side
  175/70-12 165/70-12 Difference
Diameter inches (mm) 21.65 (549.8) 21.09 (535.8) -0.55 (-14) -2.5%
Width inches (mm) 6.89 (175) 6.5 (165) -0.39 (-10) -5.7%
Circum. inches (mm) 68 (1727.25) 66.27 (1683.27) -1.73 (-43.98) -2.5%
Sidewall Height inches (mm) 4.82 (122.5) 4.55 (115.5) -0.28 (-7) -5.7%
Revolutions per mile (km) 931.74 (578.95) 956.08 (594.08) 24.35 (15.13) 2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.49 mph (31.37 km/h)
25 mph (40.23 km/h)24.36 mph (39.21 km/h)
30 mph (48.28 km/h)29.24 mph (47.05 km/h)
35 mph (56.33 km/h)34.11 mph (54.89 km/h)
40 mph (64.37 km/h)38.98 mph (62.73 km/h)
45 mph (72.42 km/h)43.85 mph (70.58 km/h)
50 mph (80.47 km/h)48.73 mph (78.42 km/h)
55 mph (88.51 km/h)53.6 mph (86.26 km/h)
60 mph (96.56 km/h)58.47 mph (94.1 km/h)
65 mph (104.61 km/h)63.34 mph (101.94 km/h)
70 mph (112.65 km/h)68.22 mph (109.79 km/h)
75 mph (120.7 km/h)73.09 mph (117.63 km/h)
80 mph (128.75 km/h)77.96 mph (125.47 km/h)
85 mph (136.79 km/h)82.84 mph (133.31 km/h)
90 mph (144.84 km/h)87.71 mph (141.15 km/h)
95 mph (152.89 km/h)92.58 mph (148.99 km/h)
100 mph (160.93 km/h)97.45 mph (156.84 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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