06-27-2016, 05:19 PM | #23 | |
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06-28-2016, 05:51 AM | #24 |
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I've been thinking of going with the deeper concave ARC-8 version with 235/40/18 tires but in that thread people were going with 255's. What are the pros/cons of these size choices?
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06-28-2016, 10:45 AM | #25 | |
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anytime you change from factory spec it will change the performance. typically, larger changes are more noticeable. diameter affects final gearing which affects speedometer and odometer. overall height and wheel gap also change. obviously there will be more grip as go wider but it increases friction drag. tire weight also increases and both could affect fuel economy and acceleration. personally, my choices are made with all these variables and more in mind. most people don't know or care and just go for aesthetics, nothing wrong with that... 245/40 and 255/40 are sizes which fit that balanced area. they are also running square which reduces the understeer that is inherent with staggered set ups and is another discussion in itself. |
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06-28-2016, 10:48 AM | #26 | ||
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06-28-2016, 11:48 AM | #27 | |
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either size will work and look fine. the 255 has a lot more grip obviously. if you don't drive with that need, 235's will work fine. 235's are taller and 255's have broader shoulders. both will help lessen the unsightly fenderwell gap. 245's are the happy medium but would look better if your car is lowered you might want to consider the ps-7 or ec-7. they are heavier but look more concave than arc-8 due to spoke design. how about a square set of 18x8.5 ET35 PS-7's or EC-7's on 235/45/18 Michelin Pilot Super Sports. still got a concave look with the best light performance tires. 43 lbs a corner. |
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06-28-2016, 11:54 AM | #28 | ||
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06-28-2016, 11:56 AM | #29 |
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06-28-2016, 12:13 PM | #30 |
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I was talking about your original reply.
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06-28-2016, 12:27 PM | #31 |
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06-28-2016, 12:33 PM | #32 |
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here...this guy has xdrive with 18x8.5 and 245/40/18.
http://f30.bimmerpost.com/forums/sho...+255%2F40%2F18 |
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06-28-2016, 12:38 PM | #33 | |
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Matt from APEX just emailed me this:
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06-28-2016, 12:50 PM | #34 |
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there are many threads and posts of members here with conservative setups like what you are planning and much more aggressive setups. i just showed you a thread of a member with a setup almost exactly what you are planning. if that's not good enough proof then i am certainly not going to stop you from following matts advice.
here's another for what it's worth oops, never mind that's this same thread Last edited by alohasurftoad; 06-28-2016 at 01:05 PM.. |
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06-28-2016, 01:11 PM | #35 | |
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06-28-2016, 01:17 PM | #36 |
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08-09-2016, 12:04 AM | #37 |
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i've been on the same situation before and tried to figure out the best wheel option for my F31 w/ stock suspension. current wheel and tire set up is SSR type C RS 18x8.5 et32 245/40/18 square.
currently have another set of SSR type C RS 18x9.5 et35 planning on putting on 255/40/18 on these. anyone tried this out yet? |
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08-09-2016, 08:16 AM | #38 |
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Figured I would give an update since I started the thread. Been super busy getting my house in order before my baby comes next month, so I still haven't taken the time to snap any more pics. I did make it to 2 autocross events this summer, and daily driving on this setup. Still zero rub with my setup Apex Arc-8 18x9 ET42 with MPSS 255/40/18 on stock baseline suspension.
The location that I typically do autocross is actually a small banked circle track with a flat cross that goes through the infield. The way the first event of the season was setup the transition from the banked track to the flat infield was pretty brutal. A couple people told me on rebound at least one of my tires was getting several inches of air. So, I'm sure the suspension was getting full compressed as well, and still no rub. Also, I have been really happy with the square setup. The 255/40 w/ the MPSS provides plenty of grip for the rear, at least for my 328i 6MT. While on course, its actually difficult to get the rear to kick around using my right foot. I'm hoping the Dinan Sport tuner I just ordered will give me enough extra power to make that a little easier when needed. Also, any less tire up front and I'm sure I would not have made a few of the faster sweeping corners this past weekend. After the first lap my brakes just weren't able to bite hard enough, so I was still under-steering like crazy.
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2013 BMW 328i 6MT - Dinan Sport Tune, Eibach Sportline Springs, Apex Arc 8 18x9, MPSS 255/40/18 Square Last edited by nadthomas; 08-09-2016 at 11:54 AM.. |
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08-09-2016, 10:40 AM | #39 |
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The 9.5's fit up front without spacers?
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09-08-2016, 06:02 PM | #40 |
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to confirm, you are running the 18x9 et42 up front with NO SPACER?
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09-10-2016, 02:41 PM | #42 |
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that's interesting... how close are you to the strut?
Reason I'm asking is I'm picking up a set tomorrow, same setup and don't want to run a spacer if I don't need to.
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10-18-2016, 09:45 PM | #43 |
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I picked up the arc-8's in 18x9 et42 and finally got them on.
Here is a pick running 255/35 18 Dunlops. This setup required no spacers. I picked up some new Michelin Pilot Sport AS 3+... these are some big burly tires and I had rubbing on the front strut. No worries, I brought my 10mm Burger Spacer for the front and the 12mm H&R for the rear and ended up with this setup. 255/40 Square on 18x9 et42. I love these tires. Perfect for daily use and the ride is so much better than the RTF 19" Bridgestone setup. I'll also add that the weight difference between the ARC and 403m is unbelievable. I like how it looks too.
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10-19-2016, 05:47 AM | #44 |
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MPSS 255/40/18 (which is a wide tire) on 18x8.5 ET38 will clear the front struts.
I would go with 255/40/18 instead of 245/40/18 because you have a bit more sidewall. |
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