Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/70r15 vs 205/60r15 Tire Comparison Side By Side
  185/70-15 205/60-15 Difference
Diameter inches (mm) 25.2 (640) 24.69 (627) -0.51 (-13) -2%
Width inches (mm) 7.28 (185) 8.07 (205) 0.79 (20) 10.8%
Circum. inches (mm) 79.16 (2010.62) 77.55 (1969.78) -1.61 (-40.84) -2%
Sidewall Height inches (mm) 5.1 (129.5) 4.84 (123) -0.26 (-6.5) -5%
Revolutions per mile (km) 800.42 (497.36) 817.02 (507.67) 16.6 (10.31) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.59 mph (31.53 km/h)
25 mph (40.23 km/h)24.49 mph (39.42 km/h)
30 mph (48.28 km/h)29.39 mph (47.3 km/h)
35 mph (56.33 km/h)34.29 mph (55.18 km/h)
40 mph (64.37 km/h)39.19 mph (63.07 km/h)
45 mph (72.42 km/h)44.09 mph (70.95 km/h)
50 mph (80.47 km/h)48.98 mph (78.83 km/h)
55 mph (88.51 km/h)53.88 mph (86.72 km/h)
60 mph (96.56 km/h)58.78 mph (94.6 km/h)
65 mph (104.61 km/h)63.68 mph (102.48 km/h)
70 mph (112.65 km/h)68.58 mph (110.37 km/h)
75 mph (120.7 km/h)73.48 mph (118.25 km/h)
80 mph (128.75 km/h)78.38 mph (126.13 km/h)
85 mph (136.79 km/h)83.27 mph (134.02 km/h)
90 mph (144.84 km/h)88.17 mph (141.9 km/h)
95 mph (152.89 km/h)93.07 mph (149.78 km/h)
100 mph (160.93 km/h)97.97 mph (157.67 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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