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AMG Aero 2 Question
- Thread starter TimL
- Start date
Sounds like there is no clear yes or no answer then and a bit of a risk of ending up with a set that has plenty of visual lipstick but schmeared over cracks underneath 
Shame. I came across this car and love the look of the wheels on the 036, especially with the slightly shorter sidewall tires he has on there
Shame. I came across this car and love the look of the wheels on the 036, especially with the slightly shorter sidewall tires he has on there
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I love them on a 140… they seem too busy for me on a .036. I would expect them all to crack with the holes so close. As a matter of physics I don’t know if that’s a factor or not.
maw
EDIT… not to derail the thread, but does anyone know what are these wheels?
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All about the barrell… skip the “step” would be my thought… just have the face fit deep in the barrell, like 1” up front, 2” out back
… they’re already conspicuous so just make it overly so with the lip… like Mobb Deep said, “there’s no such things as halfway crooks.”maw
Okay… never had a Cracked one from BBS! But I will not make them too.. only the OZ Centers!Gotta disagree, these also Crack. I've had 3 cracked 140 BBS wheels here in the shop......and I've seen others for sale with cracks.
9" front for a car as big as the W140... there must be something I'm missing about the kids trying to put wider wheels on the fronts of cars 2/3 that size... weight must be the reason OEM seem to be putting the smallest wheel that will do the trick, not the largest.
Guys are out here trying to put 10" wide square fitments on E46M cars, which seems krayseeloco to me.
maw
Guys are out here trying to put 10" wide square fitments on E46M cars, which seems krayseeloco to me.
maw
I have a set of these no lug bolt area cracks but the barrels do crack but that may be just
wide wheels and poor roads in the UK
If I was buying a set I would specificly ask the seller if there are any repaired cracks
Does anyone know of a source for replacement barrels ?
Graeme Johnson
wide wheels and poor roads in the UK
If I was buying a set I would specificly ask the seller if there are any repaired cracks
Does anyone know of a source for replacement barrels ?
Graeme Johnson
OEM fitments are always balancing / juggling a lot of things, including fuel economy / rolling resistance, both of which improve with a narrower tire.
Super-wide front tires help with lateral grip on track-day specials like the Camaro/Mustang variants, which IIRC can have something silly like 10-11 inch front wheels and 300+mm front tire section width? I can't recall the years/models but I remember reading about this in one of the auto rags (C&D or R&T) not long ago. This is great for pulling 1.0-1.2 G's on the track, but seriously, how many people actually do that stuff, besides Jono?
Apparently everyone who's buying E46M cars these days. Almost to the one, they have some track day car in mind.
maw
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Here is an UK vendor of barrels and other parts related to these wheels:
Split Rim Barrels Archives - Torque Partz
www.torquepartz.com
Size of small bolts around face of 3-pc OZ AMG wheel | Wheels and Tires
Hello I have just purchased set of Oz Amg but i can't find what type or size nut to remove multiple bolts on the face of the wheels Can anyone help Thanks Dik Best
www.500eboard.co
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Thank you one of mine has a repaired crack and I would feel a lot safer with a new barrel
Thinking about it, these W140 wheels have a quite specific offset which is incorrect for most
other models so there not that expensive .
I wunder if cracked wheels could be bought cheaply enough, could the centres be built up in to
3 peice split rims with a more common offset by using replacement lips and barrels so as to avoid
the lug bolt hole cracks and the very high cost of genuine 3 peice AMG wheels or am I going mad
Graeme Johnson
Thinking about it, these W140 wheels have a quite specific offset which is incorrect for most
other models so there not that expensive .
I wunder if cracked wheels could be bought cheaply enough, could the centres be built up in to
3 peice split rims with a more common offset by using replacement lips and barrels so as to avoid
the lug bolt hole cracks and the very high cost of genuine 3 peice AMG wheels or am I going mad
Graeme Johnson
Yes to all. You can build 3-modular wheels to whatever offset, just request for lip & barrel width at your preference and you're good to go. Be aware of how the lip/barrel width is measured, normally it is on the inside at the tire interface. And it is plenty of wheel & tire calculators on the internet which is helpful for comparison to choose your exact set up.
A New Costum made Center, depends how many are Made, are easily 1000$ per Piece and more.. that I can tell you up front!
I wasnt looking for a new centre ,I was wondering if the existing centre from a 2 peice
split wheel could be built into a 3 peice with a new lip and barrel
But looking at the shape of the centre today and how it sits in the existing barrel
no it would not work
Graeme Johnson
split wheel could be built into a 3 peice with a new lip and barrel
But looking at the shape of the centre today and how it sits in the existing barrel
no it would not work
Graeme Johnson
Yea, i wanted to 3 piece these too but they were designed as a 2 piece rim.
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Are they forged? Why do they crack? Are forged Ronal wheels known to crack too?
@Benzy Boy - per post #2 it is the 3-piece AMG Aero 3 made by OZ Racing which is prone to cracking.
The centers are forged yes, and prone to cracking in the section between the hub center bore and the bolt holes. The cracks are just as hairlines and hard to see. This is a fatigue problem due to a combination of the alloy, residual stress from production, the design itself and dynamic loads resulting in fatigue cracking. A weld repair won't hold up but start cracking again in the heat affected zone (HAZ) along the edge of the weld. So this particular alloy has a pretty complex weldability i.e. it cannot be welded under regular conditions. However, I have still not seen any Aero 3 separating from the car during driving, and I'm sure they have been heavily abused on the track with cracked centers to the ignorance of the driver.
As for the OZ lips & barrels, they are not that crack sensitive but they may crack if they are badly curbed or get a bad hit. But it's easier to do a controlled weld repair on them. Enclosed images during a weld repair I did on a cracked rear barrel.
The centers are forged yes, and prone to cracking in the section between the hub center bore and the bolt holes. The cracks are just as hairlines and hard to see. This is a fatigue problem due to a combination of the alloy, residual stress from production, the design itself and dynamic loads resulting in fatigue cracking. A weld repair won't hold up but start cracking again in the heat affected zone (HAZ) along the edge of the weld. So this particular alloy has a pretty complex weldability i.e. it cannot be welded under regular conditions. However, I have still not seen any Aero 3 separating from the car during driving, and I'm sure they have been heavily abused on the track with cracked centers to the ignorance of the driver.
As for the OZ lips & barrels, they are not that crack sensitive but they may crack if they are badly curbed or get a bad hit. But it's easier to do a controlled weld repair on them. Enclosed images during a weld repair I did on a cracked rear barrel.
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From the Point of Design.. there is nothing wrong with the Design Itself. Did run the Centers true the FEM Analysis with very very high Forces (more then required from German TüV) and the Design itself is not a Problem. Ok here an there could be a 1Milimeter more wall thickness, but not bad it all for the time they are designed!
Is more a Production/Alloy and Abuse of RattelGun Problem!
When we designed the new Centers, we did inforce the known areas to max thickness! Just in Case..
And yes, welding is no option! They crack soon again…
Thanks for the comments, good discussion! 
It depends on which parameters are put into the FEM analysis, and a little bit more material added here and there may exactly be enough to change the stress pattern and move stress concentrations out of critical areas. Residual stress from the production process are normally aging out pretty fast and after some time of use it is way below critical values. The Aero 3 is an optimized design - the strength comes from the Aluminium forging process, and increased content of Magnesium gives weight reductions. But the downside with increased Magnesium content is reduced elongation properties, commonly understood as brittleness. The key is to find the optimal balance for the purpose of the product, and the Aero 3 is as you say really good for its time. And I fully agree about using an impact driver, it is a killer on these wheels!
It was smart of you adding more material in critical areas! Your wheel design are promising and good looking!
It depends on which parameters are put into the FEM analysis, and a little bit more material added here and there may exactly be enough to change the stress pattern and move stress concentrations out of critical areas. Residual stress from the production process are normally aging out pretty fast and after some time of use it is way below critical values. The Aero 3 is an optimized design - the strength comes from the Aluminium forging process, and increased content of Magnesium gives weight reductions. But the downside with increased Magnesium content is reduced elongation properties, commonly understood as brittleness. The key is to find the optimal balance for the purpose of the product, and the Aero 3 is as you say really good for its time. And I fully agree about using an impact driver, it is a killer on these wheels!
It was smart of you adding more material in critical areas! Your wheel design are promising and good looking!
