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Old 06-01-2012, 12:50 PM   #1
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17 x 7.5 or 18 x 8!!!

ok so i have a dilemma, every one seems to be saying for the 2012 Focus (se sport) to go with 17" aftermarket wheels, the 17's i want are 7.5" width, but in 18 there 8". Im leaning toward the 18's just for the 8" width, but Is the 8" that much better then a 7.5. My logic is that the 8" width will give me 1 more inch of contact on the front & back vs the 7.5. i plan on going with Hankook v12 evo, 245/40ZR17 or 235/40ZR18. Any opinions , comments, concerns, and guidance would be appreciated.


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Old 06-01-2012, 01:02 PM   #2
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18's all day.fill in that big ass gap and drop it like its hot
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Old 06-01-2012, 01:28 PM   #3
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thats my thinking haha
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Old 06-01-2012, 01:38 PM   #4
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what are your priorities? 18's will probably get worse mpg's, should weigh a little more and the rubber will cost more. At the same time, if the 18's are the look you are wanting, go for it. It should give you some better grip on the corners...
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Old 06-01-2012, 01:48 PM   #5
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mpg and comfort are not a huge priority i had a jeep before so anything is improvement. I'm more concerned with the difference between 7.5 and 8 and if it make much of a difference.
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Old 06-01-2012, 01:51 PM   #6
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Quote:
Originally Posted by adrst2.3 View Post
18's all day.fill in that big ass gap and drop it like its hot
Yeah, except wheel size has NOTHING to do with overall tire diameter.

If you do aftermarket wheels right, you keep the outside diameter of your tires the same as stock. Width may change and the sidewall profile may change, but the outside diameter should NOT change beyond 2%. With a 17" wheel and standard non-stretched fitment, that means a 215/50R17 tire, and an 18" wheel requires a 235/40R18 tire to maintain a similar tire diameter.

That being said, I went with 18x8 wheels on mine. My mileage has suffered, but the car looks better and handles better. All depends on what matters to you.
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Old 06-01-2012, 05:54 PM   #7
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18" if performance is your main concern. As far as rim width ranges are conerned, depending on the size, a tire can fit a range of rim width's. For example most 225/45R17 can fit any 17" wheel with a 7-8.5" width. Depending on what wheel width you install the 225/45R17 your contact patch grow or reduce in size slightly(very minimal). Unless you want a wider tire that won't fit a 7.5" wheel width, I think basing your decision on wheel width is the wrong way to go.
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Old 06-02-2012, 10:06 PM   #8
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would the 245/40ZR17 fit on a 17x7.5, because i want the same profile tire as the 18's would have.
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Old 06-02-2012, 10:20 PM   #9
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Quote:
Originally Posted by GR34TWHI73N0RTH View Post
would the 245/40ZR17 fit on a 17x7.5, because i want the same profile tire as the 18's would have.
By profile, you mean sidewall height?

I can tell you right now that not only is that tire going to be too wide for a 7.5" wheel, but it's going to be too short as well.

You need to run a 215/50R17 for your speedometer to read correctly and your odometer to work properly. The next closest size is a 225/45R17.

The first number is width in millimeters, and the second number is the sidewall profile.

If you want the same profile as an 18" tire, get an 18" wheel and matching 18" tires.
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Old 06-04-2012, 01:15 PM   #10
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ok thanks for advise, I'm kinda a newb with tires.
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