10-08-2016, 11:37 AM | #45 |
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You are awesome! Was literally just trying to look up the weight info as I'm on the fence between the BBS SR at 26 lbs, the 640m (I didn't know the weight), and the Apex at 21.25. Thank you!
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10-15-2016, 04:40 PM | #46 | |
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Does anybody know for sure how well the M2's DTC and DSC systems can cope with a square setup?
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10-15-2016, 08:18 PM | #47 | ||
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10-16-2016, 12:21 AM | #48 |
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I really hope not as Apex just sold a huge junk of square set ups for winter to M2/3/4 owners. I can't imagine the computer can't handle a slight change in diameter and width. People change rims all the time and with that is sometimes dramatic changes in height and width and most importantly weight. Doesn't make sense.
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10-16-2016, 01:12 AM | #49 | |
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10-16-2016, 09:55 AM | #50 | |
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I'm with you, and I already put my money where my mouth is by buying a square F80 winterset. I'm still 99% sure I won't have an issue, but would like to know for sure. I may end up swapping wheels a week or two early just to do some testing. I suspect that most people who run a square setup at the track do so with DTC/DSC off, so if there was an issue, it wouldn't show up there. Here are a couple of posts I've read on the topic, which triggered my OCD: http://f87.bimmerpost.com/forums/sho...20&postcount=9 http://f87.bimmerpost.com/forums/sho...32&postcount=8
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F87 '16 M2 ... Mineral Grey, 6MT, Exec, MPE Gone: E82 '13 135is 475/586 ... Mineral Grey / Oyster, DCT, Premium, Tech, HK, Michelin PSS, BMW Performance Suspension Last edited by CAVU; 10-16-2016 at 01:17 PM.. |
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10-16-2016, 10:56 AM | #51 |
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I spoke to tire rack about a square setup for winter wheels and they thought there could be an issue with traction control ( DSC and DTC). In there winter wheel configurator only a mixed 19 setup was an option. I went with 640M 18 inch staggered setup to be sure. It's a shame tire rack could not give us a definitive answer on this forum. It's too late for me but it would have been nice to know the options.
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10-16-2016, 12:21 PM | #52 |
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OZ Racing Italy also could not provide 100% sure answer. They only know that 9,5x18 OZ CHALLENGE HLT ET33 will work on the car. No other from them and they also not sure about tires ...
640M 8.5J + 9J with 235/40R18 & 255/35R18 seem 100% best option and the only factory approved now (except of 19" OEM) |
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10-16-2016, 04:32 PM | #53 | |
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10-16-2016, 08:21 PM | #54 |
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10-16-2016, 10:21 PM | #55 |
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That's what I'm hoping to hear and it does make sense that a square setup with same wheel diameter front and back would actually be the best case scenario for DTC/DSC with some threshold built in for different diameters in staggered setups.
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10-17-2016, 04:45 PM | #56 |
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Anybody with more clarification on this issue? I ordered the square Apex setup at 18x9 +31 with 245/40 all around. I'm wondering if I should change this to the 235/40 and 255/35 people are referencing as the staggered option. In their writeup Apex talks about square being their reccomended fitment although that seems copied and pasted throughout for every version of the F8X and Ex M2/3/4 etc. so not sure if thats actually based on anything.
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10-18-2016, 04:20 AM | #57 | |
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10-18-2016, 04:25 AM | #58 |
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You are right. On leebmann24 they say "mit gleicher Bereifung - 235/40 R18 95V vorne und hinten (Schneekettentauglich)" = with the same tires - 235/40 R18 95V front and rear (snow chain possible)
So this must be true. It is allow to have square setup . But still looks better with front 235/40 R18 95V, 255/35 R18 94V rear |
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10-19-2016, 02:19 PM | #59 | |
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But personally I don't see the point in insisting driving the M2 in harsh winter conditions (and having the square setup). It's not that you can not do it, it just doesn't make sense. |
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10-20-2016, 09:39 AM | #60 |
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Not sure I understand what you're saying - What doesn't make sense? driving the M2 in winter at all, or driving the M2 on 10mm more width in the rear with a smaller sidewall?
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10-20-2016, 12:05 PM | #61 |
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Winter is a very different notion, depending on location... I can see the point of using a staggered winter set-up for temperatures bellow 7 deg C, in the mild winters we have in this part of Europe. But driving on regular basis in the snow (and needing thinner, square set up, tires) doesn't make much sense to me, in a M2 anyway. Just my 2c
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10-20-2016, 02:14 PM | #62 | |
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10-20-2016, 03:59 PM | #63 | |
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FYI - if you guys size out the tires (meaning see exactly how big they are in terms of diameter), you will see the actual issue is with the fronts not the rears (compared to stock).
Anyway, my point here is, BMW supports (and I believe recommends) the square setup. The wider rears are an option, and apparently the only one my dealer could find. Quote:
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10-21-2016, 10:57 AM | #64 | |
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10-23-2016, 07:20 AM | #66 |
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Yep- There is not a ton of profit in the the wheel/tire combo. See if they will split it with you?
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