Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/60r12 vs 195/60r12 Tire Comparison Side By Side
  165/60-12 195/60-12 Difference
Diameter inches (mm) 19.8 (502.8) 21.21 (538.8) 1.42 (36) 7.2%
Width inches (mm) 6.5 (165) 7.68 (195) 1.18 (30) 18.2%
Circum. inches (mm) 62.19 (1579.59) 66.64 (1692.69) 4.45 (113.1) 7.2%
Sidewall Height inches (mm) 3.9 (99) 4.61 (117) 0.71 (18) 18.2%
Revolutions per mile (km) 1018.83 (633.07) 950.76 (590.77) -68.07 (-42.3) -6.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.43 mph (34.49 km/h)
25 mph (40.23 km/h)26.79 mph (43.11 km/h)
30 mph (48.28 km/h)32.15 mph (51.74 km/h)
35 mph (56.33 km/h)37.51 mph (60.36 km/h)
40 mph (64.37 km/h)42.86 mph (68.98 km/h)
45 mph (72.42 km/h)48.22 mph (77.61 km/h)
50 mph (80.47 km/h)53.58 mph (86.23 km/h)
55 mph (88.51 km/h)58.94 mph (94.85 km/h)
60 mph (96.56 km/h)64.3 mph (103.47 km/h)
65 mph (104.61 km/h)69.65 mph (112.1 km/h)
70 mph (112.65 km/h)75.01 mph (120.72 km/h)
75 mph (120.7 km/h)80.37 mph (129.34 km/h)
80 mph (128.75 km/h)85.73 mph (137.97 km/h)
85 mph (136.79 km/h)91.09 mph (146.59 km/h)
90 mph (144.84 km/h)96.44 mph (155.21 km/h)
95 mph (152.89 km/h)101.8 mph (163.83 km/h)
100 mph (160.93 km/h)107.16 mph (172.46 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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