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Old 04-05-2001, 09:09 AM   #1
Matey
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Post 205/55-16's 215/45-17's what does it all mean?

i basically know that 16 and 17 refers to the wheel size, but what does the 205 adn 215 mean, and what does 55 and 45 mean? mesurements of the side wall and the width of the tire?
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Old 04-05-2001, 09:10 AM   #2
ChaosThom
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www.tirerack.com does an excellent job of explaining this.
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Old 04-05-2001, 09:17 AM   #3
Matey
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been there, but i guess i'll go again!
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Old 04-05-2001, 02:51 PM   #4
bryanw
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Old 04-05-2001, 02:56 PM   #5
Matey
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super! and i take it the wider the tire the smaller the sidewall? no?

man i need my car!!!!!!!!!! to out stuff on it!!!!!
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Old 04-05-2001, 04:18 PM   #6
Dar97
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No..because the sidewall number is a percentage of the width.

A 205/40R16 will be lower than a 215/40R16 because 40% of 205 is lower than 40% of 215.

So the wider tire (assuming the same aspect ratio) will be taller.
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Old 04-05-2001, 06:49 PM   #7
garface
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Why the percentage, why not just say what it is? That would be easier.
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Old 04-05-2001, 10:48 PM   #8
Herbie
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Percentages are used for proportionality.

Ever do a +1 or +2 on a wheel/tire combo? Its pretty easy to see when you go from a 16" to a 17" wheel, you need a lower overall sidewall height if you want the overall diameter to be the same. You generally drop 10% in the aspect ratio (55 to 45, etc.), no matter what the width, etc.

Its just a lot easier to specify than saying that you go from a 112mm sidewall to about a 96mm sidewall if you started with a 205mm wide tire like on our cars, but you go from a 123mm sidewall to a 105mm sidewall if you're plus-one on a camaro or something that starts with wider tires...
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Old 04-06-2001, 12:19 AM   #9
RSarte
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On a side note... Max Power Magazine has a great issue for April 2001 which has a profile on wheels and rims along with some great articles on what all all these tire/wheel technology means (like the tire codes and such). It's pretty cool that I had to pick it up, cause they also have some cool pics on some nice looking rims. The Us version is all about Euro cars, but the UK version is cool cause they have some nice profiles on all different types of performance cars, not just euros.. they even had some sweet ass profiles on some Imprezas last issue I saw.

hope that helps..
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Old 04-06-2001, 12:24 AM   #10
tmat3
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Let's use your example : 205/55-16

205 = The width. The tire has a width of 205mm.
55 = Aspect ratio : the sidewall has a height of 55% of the width. Therefore the sidewall height = 205mm x 0.55.
16 = For a 16in wheel.
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Old 04-06-2001, 12:43 AM   #11
scott_gunn
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Here is the link.
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