Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
220/70r14 vs 195/65r15 Tire Comparison Side By Side
  220/70-14 195/65-15 Difference
Diameter inches (mm) 26.13 (663.6) 24.98 (634.5) -1.15 (-29.1) -4.4%
Width inches (mm) 8.66 (220) 7.68 (195) -0.98 (-25) -11.4%
Circum. inches (mm) 82.08 (2084.76) 78.48 (1993.34) -3.6 (-91.42) -4.4%
Sidewall Height inches (mm) 6.06 (154) 4.99 (126.75) -1.07 (-27.25) -17.7%
Revolutions per mile (km) 771.96 (479.67) 807.36 (501.67) 35.4 (22) 4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.12 mph (30.78 km/h)
25 mph (40.23 km/h)23.9 mph (38.47 km/h)
30 mph (48.28 km/h)28.68 mph (46.16 km/h)
35 mph (56.33 km/h)33.47 mph (53.86 km/h)
40 mph (64.37 km/h)38.25 mph (61.55 km/h)
45 mph (72.42 km/h)43.03 mph (69.24 km/h)
50 mph (80.47 km/h)47.81 mph (76.94 km/h)
55 mph (88.51 km/h)52.59 mph (84.63 km/h)
60 mph (96.56 km/h)57.37 mph (92.33 km/h)
65 mph (104.61 km/h)62.15 mph (100.02 km/h)
70 mph (112.65 km/h)66.93 mph (107.71 km/h)
75 mph (120.7 km/h)71.71 mph (115.41 km/h)
80 mph (128.75 km/h)76.49 mph (123.1 km/h)
85 mph (136.79 km/h)81.27 mph (130.8 km/h)
90 mph (144.84 km/h)86.05 mph (138.49 km/h)
95 mph (152.89 km/h)90.83 mph (146.18 km/h)
100 mph (160.93 km/h)95.61 mph (153.88 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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