|
|
01-25-2013, 12:24 AM | #45 |
Shenanigans
86
Rep 1,252
Posts |
I'm still on stock RTFs but will change them to regular tires as soon as they are worn out. My wheels appear to be fine right now. Texas roads are pretty smooth. Although I cringe every time I accidentally go over a bump in the road. Fingers crossed.
__________________
[Current] Tesla Model 3 Performance [Retired] Audi R8 V10 6MT, BMW i3 BEV, BMW i3 REx, BMW Z4 sDrive35i DCT, BMW 335i Coupe 6MT |
Appreciate
0
|
01-25-2013, 09:25 AM | #46 |
Happy Camper
628
Rep 7,869
Posts
Drives: C63 AMG & 280 SL on Weekends :
Join Date: May 2010
Location: GTA, Ontario - Canada
iTrader: (0)
Garage List 1969 Restored Merce ... [7.50]
2011 M3 Coupe TRADED [7.34] 1987 BMW 535is [1.00] Cars from the Past [6.50] The ///M3 Engine S65 [9.59] |
And the story continues ... I wonder if it be worth while to write to the top dog of BMW that mails me the fine BMW magazine and tell him the story of my two rear cracked 296 wheels and how I got royaly screwed over by BMW.
Nah ... I think it be a waste of time ... Bet he has many letters like it. Sorry to see so many of my former Z4 friends also now have the 296 cracked wheel syndrom. Someone PM me details of that re-designed wheel, perhaps I should write that letter to the top dog of BMW ... Who knows he may even authorize to cut a cheque of $800- that I was screwed out off by BMW. Hahaha
__________________
Cheers, Rolf-Dieter
Life will take us to some interesting places, fortunately The ///M3 will too with a many of us know this very well, now my C6.3 AMG with 487 HP does it too ---> Click here for some good stuff I found |
Appreciate
0
|
01-25-2013, 01:03 PM | #47 |
First Lieutenant
205
Rep 393
Posts |
|
Appreciate
0
|
01-25-2013, 08:46 PM | #48 |
Captain
46
Rep 640
Posts |
If you go to this post in the hyperlink you will see the shallow center drop (step) on the older style (Top photo) vs the larger center drop (step) on the newer design (Bottom Photo). The larger center drop increases the cross sectional moment of Inertia and decreases the Hoop stress at the outer edge where the rubber meets the rim and the cracks develope. This is especially important at the inboard side of the rim, as there are no spokes as in the outboard side. Less support = higher bending stresses. Since I won't get my old cracked wheels back I won't be doing any destructive evaluation of rim. I still theorize that minor manufacturing flaws in the castings combined with repetative bending stresses eventually leads to a fatigue crack. This along with the impact loads (hitting a bump or pot hole) imparted by the stiff side wall of the RFT tranfered to the rim combine to propagate the crack growth.
The fatigue life of a component can be expressed as the number of loading cycles required to initiate a fatigue crack and to propagate the crack to critical size. Therefore, it can be said that fatigue failure occurs in three stages – crack initiation; slow, stable crack growth; and rapid fracture. http://e89.zpost.com/forums/showthre...=643047&page=2
__________________
HerrK - 2021 X5 40i M Sport l PCD l Atlantis Blue/Ext'd Tartufo Merino l M Sport w/blue Calipers l Matt Popular l HK Sound l 740's l Exec & Drive Pro Pack Sold w/Great Memories - E89 Z4 l ED 2010 l 2011 35i l Crimson/Ext'd Coral Red w/Alum l 6 sp MT l Prem Sound l Sport Pack l 296's Last edited by HerrK; 01-26-2013 at 08:23 AM.. |
Appreciate
0
|
01-26-2013, 03:34 AM | #49 |
Captain
64
Rep 766
Posts |
So swapping to non RFT will eleviate this issue. What happens when you get that inevitable flat in the middle of nowhere?
|
Appreciate
0
|
01-26-2013, 04:09 AM | #50 | |
Shenanigans
86
Rep 1,252
Posts |
Quote:
http://www.amazon.com/Slime-70005-Sa...qid=1359194885 This actually fits nearly perfectly into the cavity in the trunk for the pass through hole. If it's a severe puncture, I would just call a tow truck.
__________________
[Current] Tesla Model 3 Performance [Retired] Audi R8 V10 6MT, BMW i3 BEV, BMW i3 REx, BMW Z4 sDrive35i DCT, BMW 335i Coupe 6MT |
|
Appreciate
0
|
01-26-2013, 10:07 AM | #51 | |
First Lieutenant
205
Rep 393
Posts |
Quote:
|
|
Appreciate
0
|
01-26-2013, 01:24 PM | #52 | |
Captain
46
Rep 640
Posts |
Quote:
Shame on BMW for not making this a "Voluntary Safety Recall"
__________________
HerrK - 2021 X5 40i M Sport l PCD l Atlantis Blue/Ext'd Tartufo Merino l M Sport w/blue Calipers l Matt Popular l HK Sound l 740's l Exec & Drive Pro Pack Sold w/Great Memories - E89 Z4 l ED 2010 l 2011 35i l Crimson/Ext'd Coral Red w/Alum l 6 sp MT l Prem Sound l Sport Pack l 296's |
|
Appreciate
0
|
01-26-2013, 01:42 PM | #53 |
Major
87
Rep 1,448
Posts |
They're not actually 10mm deeper in the metal... they've simply added a lower step to the inner edge. This increases rigidity (like ribs in roofing materials). Both my rears were replaced before this new design came out so unfortunately for me I can see my having to replace them again eventually
|
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|