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Im either getting 215/45/17's or 205/45/17's for my focus! Is there a big difference bewtween the two and also is there that much of a difference in the way it will look?
 

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If I were getting 17" rims, I'd go with the 205/45's. They retain a much closer diameter to stock which is desirable for keeping your speedo accurate. Here's a breakdown of the diameters.

195/60/15 - 24.22" (Stock)
205/45/17 - 24.26"
215/45/17 - 24.62"

Looks wise, I personally don't think that it makes too much of a difference, but that varies greatly from person to person.
 

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Umm, if 205 and 215 is the width than how does that affect the diameter in anyway ? All thats doing is putting more rubber down on the pavement. A 205 and a 215 tire with a 45 sidewall will have the exact same diameter.
 

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Mr. Wizard
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EggYolkBill said:
The height is a percentage of the width. A wider tire will be slightly larger in diameter.
Correct, the first number is tire width, the second number is the percentage of the width that makes up the sidewall. So a 205/45 has a 92.25mm sidewall, and a 215/45 has a 96.75mm sidewall. That's why when you increase the wheel size you have to decrease the sidewall ratio and increase the width, so that you find a happy medium. (It is also nice having wider tires) A helpful site for plus sizing.... http://www.1010tires.com/tiresizecalculator.asp?action=submit
 

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215-45-17 on a stock height, it will ride a little better. Lower sidewall if you want more performance or if you've lowered your car.


Also I'd avoid 205-45-17, go w/ 215-40-17 if you want the lower sidewall. Wider is better ;)
 

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if you want a bigger tread footprint for more traction, and a more lowprofile look, get 215/40. *NOTE* you are more likely to bend your rims with a lower profile tire. If you want a bigger sidewall to decrease wheel well gap, then get the 205/45. I have 215/40 on one set of rims, and 205/40's on my other set, both 17x7 rims, the 215's definetly ride better.
 
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