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 270/35r15 Tire Comparison Side By Side
  200/70-15 270/35-15 Difference
Diameter inches (mm) 26.02 (661) 22.44 (570) -3.58 (-91) -13.8%
Width inches (mm) 7.87 (200) 10.63 (270) 2.76 (70) 35%
Circum. inches (mm) 81.76 (2076.59) 70.5 (1790.71) -11.26 (-285.88) -13.8%
Sidewall Height inches (mm) 5.51 (140) 3.72 (94.5) -1.79 (-45.5) -32.5%
Revolutions per mile (km) 774.99 (481.56) 898.72 (558.44) 123.73 (76.88) 16%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.25 mph (27.76 km/h)
25 mph (40.23 km/h)21.56 mph (34.69 km/h)
30 mph (48.28 km/h)25.87 mph (41.63 km/h)
35 mph (56.33 km/h)30.18 mph (48.57 km/h)
40 mph (64.37 km/h)34.49 mph (55.51 km/h)
45 mph (72.42 km/h)38.8 mph (62.45 km/h)
50 mph (80.47 km/h)43.12 mph (69.39 km/h)
55 mph (88.51 km/h)47.43 mph (76.33 km/h)
60 mph (96.56 km/h)51.74 mph (83.27 km/h)
65 mph (104.61 km/h)56.05 mph (90.21 km/h)
70 mph (112.65 km/h)60.36 mph (97.15 km/h)
75 mph (120.7 km/h)64.67 mph (104.08 km/h)
80 mph (128.75 km/h)68.99 mph (111.02 km/h)
85 mph (136.79 km/h)73.3 mph (117.96 km/h)
90 mph (144.84 km/h)77.61 mph (124.9 km/h)
95 mph (152.89 km/h)81.92 mph (131.84 km/h)
100 mph (160.93 km/h)86.23 mph (138.78 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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