Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/75r14 vs 195/65r15 Tire Comparison Side By Side
  205/75-14 195/65-15 Difference
Diameter inches (mm) 26.11 (663.1) 24.98 (634.5) -1.13 (-28.6) -4.3%
Width inches (mm) 8.07 (205) 7.68 (195) -0.39 (-10) -4.9%
Circum. inches (mm) 82.02 (2083.19) 78.48 (1993.34) -3.54 (-89.85) -4.3%
Sidewall Height inches (mm) 6.05 (153.75) 4.99 (126.75) -1.06 (-27) -17.6%
Revolutions per mile (km) 772.54 (480.03) 807.36 (501.67) 34.82 (21.64) 4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.14 mph (30.8 km/h)
25 mph (40.23 km/h)23.92 mph (38.5 km/h)
30 mph (48.28 km/h)28.71 mph (46.2 km/h)
35 mph (56.33 km/h)33.49 mph (53.9 km/h)
40 mph (64.37 km/h)38.27 mph (61.6 km/h)
45 mph (72.42 km/h)43.06 mph (69.3 km/h)
50 mph (80.47 km/h)47.84 mph (77 km/h)
55 mph (88.51 km/h)52.63 mph (84.7 km/h)
60 mph (96.56 km/h)57.41 mph (92.4 km/h)
65 mph (104.61 km/h)62.2 mph (100.1 km/h)
70 mph (112.65 km/h)66.98 mph (107.8 km/h)
75 mph (120.7 km/h)71.77 mph (115.5 km/h)
80 mph (128.75 km/h)76.55 mph (123.19 km/h)
85 mph (136.79 km/h)81.33 mph (130.89 km/h)
90 mph (144.84 km/h)86.12 mph (138.59 km/h)
95 mph (152.89 km/h)90.9 mph (146.29 km/h)
100 mph (160.93 km/h)95.69 mph (153.99 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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