LugBolts - snapping
12-30-2007, 09:34 PM
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'10 Porsche Turbo PDK, 500e, GL450
LugBolts - snapping
Anyone else have this issue? I noticed that the SLK55 Lugbolts are smaller than the E55k bolts. 12 mm vs 14 mm.
I've been snapping my renntech bolts, Carlsson bolts like crazy and finally had adam make me some custom bolts that are a lot stronger.
Because of this I was thinking of centerlock system. can we convert our cars to a centerlock system?
I've been snapping my renntech bolts, Carlsson bolts like crazy and finally had adam make me some custom bolts that are a lot stronger.
Because of this I was thinking of centerlock system. can we convert our cars to a centerlock system?
12-30-2007, 10:18 PM
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'06 slk55
Geez, I guess that's what massive torque will do to you. That's crazy that they're snapping off! Have you simply tried your stock bolts? Do they match (cone/ball) your AM wheels? PS, Are your wheels the correct hub size? If not, do you use hubcentric rings? I'm just wondering if you're not, perhaps that's the cause of extra, undue stress to the bolts.
Last edited by dsb; 12-30-2007 at 10:20 PM.
12-30-2007, 10:45 PM
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'10 Porsche Turbo PDK, 500e, GL450
hrmp
Geez, I guess that's what massive torque will do to you. That's crazy that they're snapping off! Have you simply tried your stock bolts? Do they match (cone/ball) your AM wheels? PS, Are your wheels the correct hub size? If not, do you use hubcentric rings? I'm just wondering if you're not, perhaps that's the cause of extra, undue stress to the bolts.
I've snapped about 7 Renntech bolts and about 12 carlsson bolts all on the rear rims. Never on the fronts.
12-30-2007, 11:00 PM
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'06 slk55
I just dont get it. Those lugbolts should be stronger than that. I've seen bolts snap on cars usually at an AutoX whereas you're snapping them off at the drag strip. It might sound like a dumb question, but are you certain you're torquing the wheels to 80ft/lbs? There has to be a reason they're snapping unless it's simply due to those sticky drag radials.
12-30-2007, 11:11 PM
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'10 Porsche Turbo PDK, 500e, GL450
torquing
They are being torqued at the recommended ft/lb by each of the different vendors ...
Heh I can't wait to use the new ones too ... of course they cost as much as a set of tires ...
Heh I can't wait to use the new ones too ... of course they cost as much as a set of tires ...
12-30-2007, 11:15 PM
#7
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Heat treated 17-24 steel.......Now its time for more power....how about a pair of new cams?
Adam
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12-30-2007, 11:23 PM
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'10 Porsche Turbo PDK, 500e, GL450
Cams
You know my answer to that ...
When is Oliver arriving???
Btw I really want to know if we can find someone to widen the rear fenders an inch. I want to be able to throw 285 rubber back there. All this power and no good way of getting it to the ground is annoying.
When is Oliver arriving???
Btw I really want to know if we can find someone to widen the rear fenders an inch. I want to be able to throw 285 rubber back there. All this power and no good way of getting it to the ground is annoying.
12-30-2007, 11:26 PM
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I'll try to find someone to do the custom widebody kit for ya.
How about port/polish your heads?
12-31-2007, 03:18 AM
#11
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I am shocked to hear this happen, and not just once, but a few times. I have to admit, something does not sound right. There are cars with much more power then these still 5 lug and bolts should never have a reason to snap. They would only snap for a few reasons.
1. Incorrect bolt size
2. bolts over torqued
3. bolts under torqued
4. incorrect bolts for wheels
5. bolts to short
Correct bolts will not just snap. Even if they are cheap made in china bolts. they would not snap if they are correct.
1. Incorrect bolt size
2. bolts over torqued
3. bolts under torqued
4. incorrect bolts for wheels
5. bolts to short
Correct bolts will not just snap. Even if they are cheap made in china bolts. they would not snap if they are correct.
12-31-2007, 03:41 AM
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'06 slk55
I agree with Neal. It's definitely one those issues. Here's a question I posted awhile ago and two answers received. I think it sums it up nicely.
Originally Posted by dsb
Okay, MB makes hub-centric wheels @ 66.6mm. However, most aftermarket wheels have larger openings to accomodate various size hubs. In that case, you need a plastic/aluminum hub-centric ring to fill in the space.
My question is this.
Does the hub actually carry any load in either the OEM of AM form? Or, does it simply help center the wheel for balance? Is all the load really on just the lug bolts? And if you do need a hub-centric ring, should you opt for the aluminum one?
Thanks in advance... .
My question is this.
Does the hub actually carry any load in either the OEM of AM form? Or, does it simply help center the wheel for balance? Is all the load really on just the lug bolts? And if you do need a hub-centric ring, should you opt for the aluminum one?
Thanks in advance... .
The hub does not carry any load. The function of the hub-centric ring is only to center the rim to the hub. When fitting the wheel to the hub, the weight of the whole wheel is carryed by the centric ring, and if it is the plastic one, there is the risk that it will give in and the wheel is running slightly out of round. By using the Aluminum ring, you get a 100% centering of the wheel.
The radial loads from the wheel is transmitted from the rim to the hub by friction between the two surfaces. When the lugbolts are tensioned with a torquewench, the lugbolt will stretch and the force from the bolt is pressing the rim to the hub, and friction does the rest. That is why it is prohibited to grease the surface, since friction thereby will be reduced. only greasing allowed is the thread of the lug bolts, never the conus
The axial loads ( sideway loads ) are taken directly by the bolts.
The radial loads from the wheel is transmitted from the rim to the hub by friction between the two surfaces. When the lugbolts are tensioned with a torquewench, the lugbolt will stretch and the force from the bolt is pressing the rim to the hub, and friction does the rest. That is why it is prohibited to grease the surface, since friction thereby will be reduced. only greasing allowed is the thread of the lug bolts, never the conus
The axial loads ( sideway loads ) are taken directly by the bolts.
12-31-2007, 03:51 AM
#14
Former Vendor of MBWorld
Just to add to both those replys. Yes, the hub does carry a load. This is also noticied when you run wheels that require centering rings and dont have them in, you will feel a vibration because the wheel would be moving up and down, side by side when driving because the lugbolts cannot just hold the wheel in place perfectly while the car is moving at speeds.
12-31-2007, 03:54 AM
#15
Former Vendor of MBWorld
01-02-2008, 11:20 AM
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1990 560 SEC (modified), SLK55, CLK500
The hub only centers the wheel and holds vertical loads. When you accelerate and decelerate, the friction produced between the wheel and the hub mating surfaces should be bearing the majority of the rotational load...anyway...it's gotta be that amazing torque.
If it's really bothering you, i'll trade cars with you! btw, have you ever had catastrophic failure (wheels fall off) or do the just crack when you remove them?
If it's really bothering you, i'll trade cars with you! btw, have you ever had catastrophic failure (wheels fall off) or do the just crack when you remove them?
01-02-2008, 11:43 AM
#18
I'm glad I saw this post because I had a very interesting conversation with my car insurance company rwo years ago. I was driving on city streets at about 40mph. I hit a bump. Not too bad of a bump. Similar bump as will be seen on many metropolitan city streets. Well guess what happened.......my right rear wheel fell off and the right rear corner of the car was sitting on the ground. Completely true story. I came out of the car, totally bewildered. I picked up the rear wheel which by now was about 50ft behind me in the bushes. I inspected it and the lug bults had simply snapped off. I had aftermarket rims that had been on the car for the previous 2 years. No recent tire or rim change. You can imagine trying to explain that to the insurance company when filling a claim.
Ted
Ted
01-02-2008, 01:24 PM
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'10 Porsche Turbo PDK, 500e, GL450
failure
well most times I caught it when a lugbolt snapped and had it replaced quickly.
Unfortunately one specific time I did not catch this and all 5 lugbolts from the right rear snapped. Luckily no damage to the car.
Unfortunately one specific time I did not catch this and all 5 lugbolts from the right rear snapped. Luckily no damage to the car.
01-08-2008, 09:02 PM
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'10 Porsche Turbo PDK, 500e, GL450
yup got the bolts
now I"m waiting on the Renntech Rims to come back. I'll have them installed back on the car on Saturday. I sent them out to get flat black powdercoated! 
I'll have adam take some pics after the install.
I'll have adam take some pics after the install.
09-15-2008, 07:23 PM
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2004 C230 Kompressor Sport sedan 6 speed manual, 2013 S550 Sport 20" AMG
Anti-seize compound on the lugbolts causes them to be torqued much higher than the wrench setting indicates. It's not recommended. Could this be the issue?
06-15-2009, 01:26 AM
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From Affalterbach to Zuffenhausen
I wanted to bump this thread, possibly get some resolution. Ive pm'd SLK55R about this but maybe others can comment as well.
I have the same problem, specifically with my C55. Renntech Monolites, 18x8.5 +32 F and 18x9.5 +36R. Wrapped in RE01Rs, received lugs from renntech, and snapped them. I assume that they sent me the right ones as I stated which wheel and car I had. My rears had to be cut as I've heard is common with MBs due to screwing up the parking brake. I had about 3 snap inside. They sheared right off, I can even post up pics if necessary.
Im hoping to find a solution though so I can put them back on the C55 or my SLK55 but am fearing snapping more lugs and a wheel falling off (Already happened once but luckily I was going slow and there was no severe damage).
I have the same problem, specifically with my C55. Renntech Monolites, 18x8.5 +32 F and 18x9.5 +36R. Wrapped in RE01Rs, received lugs from renntech, and snapped them. I assume that they sent me the right ones as I stated which wheel and car I had. My rears had to be cut as I've heard is common with MBs due to screwing up the parking brake. I had about 3 snap inside. They sheared right off, I can even post up pics if necessary.
Im hoping to find a solution though so I can put them back on the C55 or my SLK55 but am fearing snapping more lugs and a wheel falling off (Already happened once but luckily I was going slow and there was no severe damage).
06-15-2009, 10:03 AM
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'10 Porsche Turbo PDK, 500e, GL450
torque rating
I switched to ... BMW lug bolts ... and just cut them down a bit. Also changed my torque to about 85ft/lbs. No snapping since.
I also changed the rear left hub which might have been the cause.
I also changed the rear left hub which might have been the cause.
