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Old 02-10-2010, 03:49 AM   #1
craigIS
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18" Rims. How do they....

I'm thinking of buying a new set of rims this year, and before I buy; I'm trying to get a feel of what I want, and what size is best for me. I'm thinking of going with either 17" or 18", but I don't know how 18's would suit me. I have a new daughter, so I do need a decent ride.

My car is a 318is, and is lowered about an inch, inch and a half all around. With 18's how is the clearance when turning, and is there any wheel rub?

Should I just get 17's and play it safe, or what? I'm not planning on buying anything to change camber or anything, so would you say 18's are out?

Thanks in advance.
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Old 02-10-2010, 07:10 AM   #2
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My summers are 17's and I think they look great so I couldn't be happier. I run 235/40/17's all around as well and I love how it looks. My car is also the stock height.

I couldn't really tell you much about 18's, but knowing most of the guys on here it's go big or go home so you will probably get alot of votes for the 18's. lol
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Old 02-10-2010, 07:19 AM   #3
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My car is dumpped and I run a stock 16inc wheel with 225/50/16 all around. My rear is tucked so basicly the top of the rim meets the fender and I don't have any issue with rubbing. If you aren't too low you should be good with either a 17 or 18 just can't go to wide with the tire.
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Old 02-10-2010, 08:08 AM   #4
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18's are more likely going to be heavier and also more likely to bend. Tires are going to be more expensive too and ride softness will be worsened compared to 17s

I'd suggest you stay with 17s on the 318.

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Old 02-10-2010, 11:05 AM   #5
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For 17" wheels; I would be running this: Tire Size: 225/45-17

for 18" wheels; I would be running this: Tire Size: 225/40-18

Do you think the 225 (8.9") tire is going to be too wide, or pushing it?
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Old 02-10-2010, 12:38 PM   #6
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Whether you'll rub or not, all depends on the rim offset and tire width...

I was running 225/40/18 on a lowered 328is (1.75" front, 1.5" rear) on 18x8 rims with 40mm offset, and had absolutely no rubbing whatsoever.

If it's comfort you're after, I would stick with 17's though, and also as mentioned above, tires would be cheaper than 18's.
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Old 02-10-2010, 12:48 PM   #7
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'Im lowered 1.5" at the front and 1" at the back. Running 18x8 m-parallels non-staggered, 225-40-18 tires, I have no rubbing issues whatsoever.

stance pic:

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Old 02-10-2010, 02:26 PM   #8
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Quote:
Originally Posted by e36.M52B25 View Post
'Im lowered 1.5" at the front and 1" at the back. Running 18x8 m-parallels non-staggered, 225-40-18 tires, I have no rubbing issues whatsoever.

stance pic:

I think my front is lower than yours, so my front may have a 2" drop.

I may just stick with 17's....for now, until my daughter is a bit older
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Old 02-10-2010, 03:21 PM   #9
Dr. Flyview
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P.S. Correct tire size for 17s is 235/40/17 not 225/45/17.
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Old 02-10-2010, 03:40 PM   #10
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Quote:
Originally Posted by Dr. Flyview View Post
P.S. Correct tire size for 17s is 235/40/17 not 225/45/17.
There is a 2.3% difference, and they are both stock sizes.

95 m3s came with 235/40r17 all around.
96+ m3s came with staggered 225/45/17 fronts and 245/40r17 in the rear.

I ran stock 17s with winters and 18s with 245s all around in the summer. Can't say i noticed at huge enough difference in ride quality to stop me from getting 18s in the future.

But with a 318, i'd be more concerned about turning huge heavy 18s.
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Old 02-10-2010, 04:17 PM   #11
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Still, 235/40/17 is closer to the stock 205/60/15
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Old 02-10-2010, 04:47 PM   #12
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Still, 235/40/17 is closer to the stock 205/60/15
Fair enough, but the difference is minor, it may play a slight role if he is close to rubbing, but then again some manufactures have 225s that are as wide as some 245s, so it will vary tire by tire. That and i believe there are far more tire choices in 225 than 235.

205/60/15 circumference is 77.6''

235/40/17 circumference is 76.7'' (-1.1% Difference)

225/45/17 circumference is 78.5'' (+1.2% Difference)
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Old 02-10-2010, 09:50 PM   #13
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stick to the 17" . on my car i put 18" on and ran them one summer and i really noticed the extra weight . i went back to 17" and my car felt lighter and handled much better.
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Old 02-23-2010, 07:37 PM   #14
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i run 225/40/18 front and 245/40/18 rear no rubbing
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