Hi guys,
I'm getting a Specialized Tarmac SL4, and I plan to put a DA 7900 crank on it. The frameset ships with a Wheels Mfg adapter like this one:
http://www.competitivecyclist.com/product-components/2011-Wheels-Mfg-BB30-Adapter-for-Shimano-7624.19.1.html

However, there is annother BB30 adapter available, which allows for standard BSA 68mm bottom bracket to bu used; it's from FSA:
http://www.fullspeedahead.com/products/449/BB30-Threaded-Adapter-68mm

My question is, which adapter offers a more durable and less creeks-prone sollution? Accorning to a Shimano Youtube video, the BB30 standards is bad, since the bearings are positioned closer appart and thus offer less support to the crankset. From this point of view, the FSA adapter, together with standard DA BSA 68mm bottom bracket, is a supperior sollution. Plus I've also heard reports, that many BB30 users experience creaks in the BB area. What do you guys think?

Best regards,
George

I do not know, what is the best solution, but I can give you some info :
I used FSA adapter with FSA K-Force Light MegaExo cranks on my Focus Izalco BB30 frame, without any problem. Adapter is 52 g, it is in the frame, but could be removed with special tool (I did it personally and I have that tool).
Now I am using BB30 cranks from Sram.

Yes, Loctite 609 or 603 are your best bets if you want to keep that FSA adaptor.

Or get one of those Delrin based ones like the Wheels Manufacturing version shown here. They are pressfit pretty tight, and due to the mildly malleable nature of delrin, does minimise on these creaking, if not eliminate altogether. Just remember to install with plenty of grease though.

Hey Folks,
Saw the thread with our Conversion BB chat. Wanted to give a few bullet points on it and why we did it this way.

- We wanted a rock solid BB that didn't have any chance of wiggling/walking out of the frame like many of the adaptors our there do. Our system is connected in the middle so there is no chance of it wiggling and wobbling out. Everything we tested avail in the market was more of a temp band-aide instead of a real solid conversion solution.
- Bearing Quality on this initial version is about an "Ultegra" level quality as we wanted to keep the price sub $100 USD
- We are fine with not being the lightest option out there, as we want to be the most solid/durable option. Balance was our goal with it. If you're going to carry a few extra grams somewhere, we feel this area is the place to do it.
- In time we'll have a higher end version with a really nice stainless steal bearing used. Higher Price point.
- Patent Pending

Hope that gives a bit more insight,
Adam @ Praxis
Manufacturer

I used the wheels conversion on a SRAM Red GXP on the Ridley Helium SL and not sure if it was mental but it felt to me like it had some give.

More recent builds I have been doing I have used the Parlee BB - Feels a lot stiffer to me but again it might be my mind playing tricks.