Discodan wrote: ↑
Wed Nov 20, 2019 10:18 am
That BB in your pic is a PF30 whereas the SSE has a BB30a which is 5mm wider. I'm just speculating but maybe they've used a PF30 BB (cheaper?) and ditched the internal sleeve as it's not long enough for PF30a. I'm not sure, but really it's not enough of an issue that I'd be replacing the BB to fix it, it's actually an advantage as you can access the internals of the frame just by removing the cranks and not the BB as well
Re the bearings being pressed straight into the frame, it's actually usually only the higher quality carbon frames that can get away with this as it relies on closer tolerances but it's common. The BB30, BB90, BB93, and BB95 standards all have the bearings pressed straight into the frame. There may actually be a very minimal plastic cup between the frame and bearing on the G3 SSE (therefore technically making it a PF30a), I didn't look that closely, but Cannondale pressed straight into the frame in other models. Have a read of the article below, a decent explanation of all of their confusingly named and weird BB "standards"
https://www.kogel.cc/blogs/kbba/cannond ... -explained
I think you are confused with the terms here. BB30, PF30, BB30a, PF30a all use the same bearings, 'a' stands for asymetric and refers to the non-driveside bearing being moved 5mm outboard and a width of 73mm but can be in both BB30a or PF30a frame while BB30 and PF30 are symetrical and 68mm wide. Then the more critical distinction as far as BB goes, BB30 (and BB30a) means bearings are pressed directly into the frame which is either an alloy frame or has a permanently bonded alloy sleeve with the bearing bores and circlips, PF30 (and PF30a) means the bearings are installed into cups and it's the cups that are pressed into the frame.
The FSA BB pictured above is both a PF30 and PF30a, most PF30 BB also work in PF30a frames.
1st gen Evo was PF30, gen 2 and now 3 are both PF30a.
Personally I prefer not having a sleeve between bearings as it allows access to Di2 wires and junction box without having to take off the whole BB in frames without a big opening underneath the frame, it's not needed often but is easy enough to route everything while making sure nothing touches the spindle.