tire height
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Joined: Oct 2010
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tire height
so i need new rear tires soon for my ap2 (stock wheels) and i noticed that the height of my front tires are 45 and the rears are 40.
why are they different, is it supposed to be?
i went on tirerack.com and it's the same thing for stock tire sizes (215/45-17 and 245/40-17)
i was just wondering why it wouldn't be the same
why are they different, is it supposed to be?
i went on tirerack.com and it's the same thing for stock tire sizes (215/45-17 and 245/40-17)
i was just wondering why it wouldn't be the same
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Joined: Apr 2012
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From: Washington, DC Metro
^Yep, and just to add, when looking at tire specs everything is in millimeters. So 245 mm is the width of the tire. To find out how much sidewall the tire has, you use the second number, in this case 40. So the sidewall is 40% of 245 mm, basically around 98 mm. The third number, the 17, represents the diameter of the wheel (in inches). If you do 45% of 215, it is something like 96.7 mm which means the sidewall is roughly the same front and rear.
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Joined: Aug 2007
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From: Houston, TX
Tirerack has a lot of good articles including one on interpreting tire sizes:
http://www.tirerack.com/tires/tirete....jsp?techid=46
Relevant section:
http://www.tirerack.com/tires/tirete....jsp?techid=46
Relevant section:
Sidewall Aspect Ratio
Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.
P225/50R16 91S
The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.
Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.
P225/50R16 91S
The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.
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jabbarahm
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May 12, 2011 11:06 PM