"WHAT DO I GET?"
Your choice of a complete set, fronts only, or rears only of new O.E.M. BMW front (FAG brand) and rear (Febi/Bilstein brand) hubsprofessionally modified on a CNC machine to allow the use of super high-strength (beyond grade 12.9) press-in ARP wheel studs. Hubs come pre-installed with ARP studs.
These aren't just simply drilled. The holes are precision machined and inspected, and the backside of the hubs are machined to allow the head of the studs to sit correctly without any stress risers from poor perpendicularity with the hub face.
It is perfect timing to simply install these on your vehicle during a bearing service and worry much less about your studs breaking whether for a dual duty track car or full blown race car. Hubs come with studs long enough to use a 12mm wheel spacer OR you can opt for a longer stud which will allow the use of a wheel spacer up to 20mm thick.
"WHO IS THIS MEANT FOR?"
Anyone who wants a endurance racing tested, reliable method of fastening wheels to their car, and keeping them there....literally. Extra peace of mind, less money spent on replacing studs out of paranoia, and a proven track record applies to every BMW enthusiast, whether drifting, tracking, or full blown racing. They also look pretty cool for hard parking...
"WHY WOULD I WANT PRESS-IN STUDS ON MY BMW ANYWAY?"
This is a solution to a documented problem in a series that our race team competes in called American Endurance Racing ("AER" www.americanenduranceracing.com), where there's upwards of 25 hours of racing per weekend. That's approximately 15-20 HPDE/track-day's worth of track time in a span of three days. Several teams who have had consistent issues and multiple instances with breaking thread-in studs, and sometimes losing wheels on track, have had zero issues to date since switching over to press-in ARP studs.
This is based on the AER database which has cars with multiple 1000's of laps in the last 2-3 years. The only cars that have had failures (and lost wheels) are BMW cars with M12 size thread-in studs. There hasn't been a single report of a press-in stud failure from cars that come that way from the factory (Mustang, Corvette, Nissan, Honda, etc.) or BMW's that have already been modified to this style utilizing ARP studs that race in AER.
Because of the frequency of thread-in stud failures, many BMW owners have been led to believe that it is necessary to service wheel studs at an abnormal rate. Some recommendations as low as 10 hours of track time. STUDS SHOULD NOT NEED TO BE SERVICED BEFORE WHEEL BEARINGS ON A TRACK CAR. The only instance where this may be the case is when the studs are subjected to repeated time sensitive pit-stops with heavy impact equipment. Simple as that. A dual duty track/street car should be able to run the same high quality, high strength ARP wheel studs for years without worry.
M12 sized fasteners in a thread-in configuration are marginal for the application and more susceptible to failure due to large stress risers at the thread root and shoulder where they install into the hub. Press-in ARP studs have large un-threaded shoulders coming out of the hub from the backside making them much more robust and fatigue resistant without stress concentrations at points of peak stress. Their ability to handle atypical loading scenarios (bending and shear) due to things like loss of pre-load (anything from installation error to plastic deformation of the aluminum wheel at the lug nut interface), debris caught in between wheel and hub, poorly constructed or out of tolerance wheels, etc., is much better than a thread-in.
"BUT, THREAD-IN STUDS ARE EASY TO CHANGE IF THEY BREAK..."
The only people who make this argument are BMW people who run M12 thread-in studs. Why? Because they are the only people who break studs at an abnormal rate!
Press-in studs CAN be serviced on the car. The front of the car requires the removal of the dust-shield and the rear of the car the e-brake must be removed and the back plate notched a bit for clearance. Remember, you will most likely need to change your wheel bearings before the need to change studs.
"WHAT IF I NEED TO CHANGE BEARINGS?"
We will offer individual front hub assemblies in the near future for existing customers with just machining done or pre-installed with studs, whether for regular maintenance, spares, or precautionary measures.
"I JUST ORDERED WHEEL HUBS AND NOW IT'S TOO LATE TO GET THIS DONE!..."
STOP RIGHT THERE! Contact us and we can have you ship us your hubs to get the machining service done and studs installed. For those of you with BMW models that have costly rear hubs (i.e.-Z3), we will offer to do the service on used hubs granted they are clean condition.
C4M BMW E36 M3, E46 Non-M Ultimate Press-in Stud Conversion Hubs
- 2 Front FAG wheel hub bearing assemblies, 2 Rear FEBI wheel hubs
- More robust & reliable than thread-in studs
- ARP wheel stud failures are extremely rare
- Can be serviced with hubs still on car
- Up to 12mm wheel spacer on 73mm stud
- Up to 20mm wheel spacer on 83mm stud (NO BULLET NOSE)
- See a return on your investment by having to service wheel studs less frequently (or seeing your hard work destroyed from a lost wheel).
- Studs will never, ever "back out"
- ARP fasteners are the best in the industry for material consistency and manufacturing methods that improve strength and fatigue life.
- M12 x 1.5 ARP wheel studs can be torqued as high as 112 FT-LBS to obtain optimal preload (although not recommended!)
- ARP fasteners are MADE IN THE USA