Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/70r12 vs 195/70r12 Tire Comparison Side By Side
  165/70-12 195/70-12 Difference
Diameter inches (mm) 21.09 (535.8) 22.75 (577.8) 1.65 (42) 7.8%
Width inches (mm) 6.5 (165) 7.68 (195) 1.18 (30) 18.2%
Circum. inches (mm) 66.27 (1683.27) 71.47 (1815.21) 5.19 (131.95) 7.8%
Sidewall Height inches (mm) 4.55 (115.5) 5.37 (136.5) 0.83 (21) 18.2%
Revolutions per mile (km) 956.08 (594.08) 886.59 (550.9) -69.5 (-43.18) -7.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.57 mph (34.71 km/h)
25 mph (40.23 km/h)26.96 mph (43.39 km/h)
30 mph (48.28 km/h)32.35 mph (52.06 km/h)
35 mph (56.33 km/h)37.74 mph (60.74 km/h)
40 mph (64.37 km/h)43.14 mph (69.42 km/h)
45 mph (72.42 km/h)48.53 mph (78.1 km/h)
50 mph (80.47 km/h)53.92 mph (86.77 km/h)
55 mph (88.51 km/h)59.31 mph (95.45 km/h)
60 mph (96.56 km/h)64.7 mph (104.13 km/h)
65 mph (104.61 km/h)70.1 mph (112.81 km/h)
70 mph (112.65 km/h)75.49 mph (121.48 km/h)
75 mph (120.7 km/h)80.88 mph (130.16 km/h)
80 mph (128.75 km/h)86.27 mph (138.84 km/h)
85 mph (136.79 km/h)91.66 mph (147.52 km/h)
90 mph (144.84 km/h)97.05 mph (156.19 km/h)
95 mph (152.89 km/h)102.45 mph (164.87 km/h)
100 mph (160.93 km/h)107.84 mph (173.55 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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