Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
200/70r15 vs 180/70r15 Tire Comparison Side By Side
  200/70-15 180/70-15 Difference
Diameter inches (mm) 26.02 (661) 24.92 (633) -1.1 (-28) -4.2%
Width inches (mm) 7.87 (200) 7.09 (180) -0.79 (-20) -10%
Circum. inches (mm) 81.76 (2076.59) 78.29 (1988.63) -3.46 (-87.96) -4.2%
Sidewall Height inches (mm) 5.51 (140) 4.96 (126) -0.55 (-14) -10%
Revolutions per mile (km) 774.99 (481.56) 809.27 (502.86) 34.28 (21.3) 4.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.15 mph (30.82 km/h)
25 mph (40.23 km/h)23.94 mph (38.53 km/h)
30 mph (48.28 km/h)28.73 mph (46.24 km/h)
35 mph (56.33 km/h)33.52 mph (53.94 km/h)
40 mph (64.37 km/h)38.31 mph (61.65 km/h)
45 mph (72.42 km/h)43.09 mph (69.35 km/h)
50 mph (80.47 km/h)47.88 mph (77.06 km/h)
55 mph (88.51 km/h)52.67 mph (84.76 km/h)
60 mph (96.56 km/h)57.46 mph (92.47 km/h)
65 mph (104.61 km/h)62.25 mph (100.18 km/h)
70 mph (112.65 km/h)67.03 mph (107.88 km/h)
75 mph (120.7 km/h)71.82 mph (115.59 km/h)
80 mph (128.75 km/h)76.61 mph (123.29 km/h)
85 mph (136.79 km/h)81.4 mph (131 km/h)
90 mph (144.84 km/h)86.19 mph (138.71 km/h)
95 mph (152.89 km/h)90.98 mph (146.41 km/h)
100 mph (160.93 km/h)95.76 mph (154.12 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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