Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/50r14 vs 205/30r12 Tire Comparison Side By Side
  195/50-14 205/30-12 Difference
Diameter inches (mm) 21.68 (550.6) 16.84 (427.8) -4.83 (-122.8) -22.3%
Width inches (mm) 7.68 (195) 8.07 (205) 0.39 (10) 5.1%
Circum. inches (mm) 68.1 (1729.76) 52.91 (1343.97) -15.19 (-385.79) -22.3%
Sidewall Height inches (mm) 3.84 (97.5) 2.42 (61.5) -1.42 (-36) -36.9%
Revolutions per mile (km) 930.39 (578.11) 1197.45 (744.06) 267.07 (165.95) 28.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)15.54 mph (25.01 km/h)
25 mph (40.23 km/h)19.42 mph (31.26 km/h)
30 mph (48.28 km/h)23.31 mph (37.51 km/h)
35 mph (56.33 km/h)27.19 mph (43.76 km/h)
40 mph (64.37 km/h)31.08 mph (50.02 km/h)
45 mph (72.42 km/h)34.96 mph (56.27 km/h)
50 mph (80.47 km/h)38.85 mph (62.52 km/h)
55 mph (88.51 km/h)42.73 mph (68.77 km/h)
60 mph (96.56 km/h)46.62 mph (75.02 km/h)
65 mph (104.61 km/h)50.5 mph (81.28 km/h)
70 mph (112.65 km/h)54.39 mph (87.53 km/h)
75 mph (120.7 km/h)58.27 mph (93.78 km/h)
80 mph (128.75 km/h)62.16 mph (100.03 km/h)
85 mph (136.79 km/h)66.04 mph (106.29 km/h)
90 mph (144.84 km/h)69.93 mph (112.54 km/h)
95 mph (152.89 km/h)73.81 mph (118.79 km/h)
100 mph (160.93 km/h)77.7 mph (125.04 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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