Originally Posted by
JoelS
It was a Guru with PF30. It came loose after about 1 test sprint on the street outside my house. I was able to remove it by hand. Guru said the frame was in spec even though 3 different mechanics at 3 different shops weren't able to get it secure. The only solution was some sort of epoxy/glue/loctite to affix the cups in the frame. I really didn't want to do that as there are potential maintenance pitfalls down the road. Guru was good enough take it back and build me a replacement with a threaded BB shell. They have a heavily knurled Al shell that they are able to wrap in in such a way as it is highly unlikely to ever break free.
I recently bought a steel framed Cyfac and, after my previous experience with press fit (and getting similar feedback from several local shops, including a Sarto dealer and another custom frame builder) decided to just go with threaded and avoid all the potential trouble.
Here is a case of the blind leading the blind. You don't work on your bikes and you are relying on guys at the bike shop who don't have a clue.
The best solution of sleeving a PF30 bike is a sleeve like C-bear designed line to line with the 46mm ID carbon shell. It requires no loctite or adhesive. Pure press and is rock solid. C-bear sells hundreds of them and they are popular on the pro peloton for those racing Campy cranks on PF30. Pressing a 42mm OD BB30 alloy sleeve like you did...into a PF30 BB with delrin bushings in place is an accident waiting to happen. The whole achilles heel of PF30 is their delrin bushings and a sleeve will squirm in delrin bushings almost as bad as all the complaints about BB30 bearings moving around in PF30 plastic bushings.