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04-01-2015, 06:26 AM | #23 |
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Groove safety risk
Gentelemen, one wheel I had damage of at least 2mm deep groove. Let's assume the wall thickness on the barrel is 5mm. I thing this is a significant weakening of the rim and even worse a sharp stress raiser. BTW .....BMW asked that my damaged wheel be shipped back to them for engineering analysis.
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04-01-2015, 07:44 AM | #25 |
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Strongly agree
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04-01-2015, 10:17 AM | #26 |
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if BMW makes 20" wheels a requirement for CCB's, I'm going to have to pass on them. 20" wheels just aren't for me. there must be another solution. Maybe a little plastic piece at the bottom of the caliper that gets real close to the barrel (almost like a scraper)? just pulling things out of my ass.
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04-01-2015, 10:37 AM | #27 |
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I haven't inspected yet, but does anyone know if adding a spacer, even a small one, increases wheel to caliper clearance and does that address the issue in this thread?
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04-01-2015, 10:43 AM | #28 |
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Wait... what other horror stories? I agree this is a design issue, but BMW appears to be assessing (?) Has anyone confirmed it's a safety concern?
The only other complaints I've seen about CCBs are 1) hearsay arguments about Porsche owners from non-Porsche owners 2) some squeaking and 3) modestly and temporarily diminished responsiveness in heavy rain or after exiting a car wash. |
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04-01-2015, 01:23 PM | #29 |
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Not just a CCB problem, as there are reports, including mine, of the same thing happening on non-CCB cars with 18 inch wheels. I like the caliper idea, maybe a couple of pieces of duct tape to see if it helps, then a permanent fix? The alternative would seem to be 19 inch wheels on non-CCB cars, and 20 inchers on the CCB cars.
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04-01-2015, 07:09 PM | #30 | |
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04-01-2015, 07:54 PM | #31 |
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That's correct. 6-8mm clearance I believe. More than the size of your average pebble. I don't want 20's either, they do absolutely nothing for performance and add unnecessary weight. But if that's what BMW comes up with for a fix, I'll take it. I was somewhat forced to take the CCB's as a part of the amazing Canada euro delivery experience this year and tried to negotiate them out. They couldn't do it and over a couple of weeks I accepted the fact and was actually quite excited to be getting them. And then this thread popped up. I was hoping they didn't come with complications (beyond what I've researched which I was more than prepared to accept) but this issue has deeper implications IMO.
Thanks for the updates Geordie, appreciated.
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04-01-2015, 08:09 PM | #32 | |
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I am surprised that BMW and Brembo didn't collaborate on this before it became an issue. You'd think something like this would've been caught in pre-production testing??? Interested and invested as to how this turns out.
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04-01-2015, 08:18 PM | #33 |
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20" are not for me, either. I just installed 19" HRE R101's tonight, and the clearance is much better. I can get a finger in there now, whereas the OE wheels you would be lucky to get a couple of dimes in there.
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04-02-2015, 10:46 AM | #34 | |
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04-02-2015, 02:38 PM | #35 | |
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04-05-2015, 06:04 PM | #36 |
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OP I just checked my wheels. I have the same issue. So I spent 8k for an option that's damaging my wheels. Pathetic. I plan on bringing this up to BMW immediately. I just bought the car and I don't have 8k laying around to buy a set of HREs
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04-05-2015, 10:51 PM | #37 |
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I can't believe that it took so long to get this thread running on this subject. This is a design flaw and if you look at the benchmark no one has this minimal amount of clearance. Seriously I wonder if M Division Vice President Engneering Albert Biermann jumped to Hyundai before he was pushed?
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04-06-2015, 08:22 AM | #38 | ||
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04-06-2015, 09:55 AM | #39 | |
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I'm trying to plan my attack on BMW lol. 8,500 dollar option...I'm definitely not letting this be. I'll PM you my VIN when I go outside for lunch. |
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04-06-2015, 06:42 PM | #40 |
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more cases? damn, this is really damping my desire for CCB's. I hope they can find an appropriate solution to this that doesn't require 20" wheels. maybe the ZCP wheels? I'm sure that's optimistic.
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04-07-2015, 08:22 AM | #41 |
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Believe me I'm not happy. I loved the CCB and said they were worth every penny up until this happened.
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04-07-2015, 09:42 AM | #42 |
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Need to hear from more who found this issue. I am promised a response by M division in 2 weeks from now (I am on an Asian business trip). I don't expect to be fobbed off as I have a solid dealer allie in this one. More pictures of your damaged rims is needed, and YES please take to your dealer the more reported cases the higher this issue will spike on the in filed warranty data....seriously this is how it works. It's PPM problems per million as a metric. We only need 25+ cases and it's straight I number one M product warranty as the CCB are a limited option. Thanks in advance.
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04-07-2015, 08:40 PM | #43 | |
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There are a lot more CCB owners out there that may not be interested in wheels/tires and therefore don't look here. And probably a lot more on order. There are a group of Canadians going to the Welt in June to pick up 10 M3's/4's. All of them will be equipped with CCB's, mine included. I WANT these brakes but not at the expense of having to deal with this sort of issue. I truly hope BMW will come up with a solution and knowing BMW as I do, I'm confident they will.
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04-08-2015, 12:34 AM | #44 | |
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I think you need to relax more and enjoy the anticipation of your new catr. You are in for an incredible experience by all accounts. Meanwhile, who knows how large of an issue this actually is (without discounting anyone's experience). If a fix is required, and the fix is a new wheel, then you can use the opportunity to get grippier tires.
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