How much of that is because it's a one piece design? Supposedly BB machining isn't as critical on them as on a BB30.

Yes, one of the reasons more and more frame makers are going to PressFit 30 over BB30 is that the tolerances for the frame's bb shell aren't as critical to make for the proper fit. The nylon encased bearing assembly tends to stay quiet in the frame (unlike bb30) and there's no circlip involved like there is with bb30.

I'm not sure which models, but even Cannondale has gone to PressFit 30 over bb30 on some of their bikes.

Hi , I had a synapse with the same problem and did all kinds of research and even contacted loctite and came up with a loctite bearing mount compound 680 and 641 one was more permanent than the other but I was told knocking the bearing out when needed was not going to be a problem. I never did the job as my FD hanger screwed up and they warranted my frame and then I went to a EVO that has a press fit BB30 but I now also have a regular supersix with a BB30 but it's not making any noise , if it does someday I'll try grease then the bearing mount compound. Any compound left behind after knocking out the bearing can be removed with a solvent as the BB is aluminum. Press fit BB do not have aluminum inserts in their BB

use loctite 609 to mount the bearings

I'd recommend against that Loctite 680 myself. Its a high strength compound and to remove it you'll be applying a sheer load with a bearing removal tool. Thats the loadong where this stuff'll be the strongest. Loctite actually recommends heating the parts to 250C before attempting removal. That'll not be nice for your paint job.

The other is a medium strength that can be removed at room temperature.

• Loctite 641
• Ideal for cylindrical parts that require disassembly.
• Recommended for maximum diameter clearance of .
• 006"

Loctite 609 recommended by FSA themselves.

609 looks like the go.