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Is this the Winter bike with the creaky BB you mentioned in your first post?
The creaking is likely from the interface between the adaptor and the BB30 bearings, rather than the adaptor bearings being shot.
Regardless of which I doubt the adaptor's bearings are replaceable, ie you would replace the whole adaptor.
If you are using 24mm cranks, you'd be better off with a Praxis Works convertor BB: it's a much better design as a) the two parts are threaded together so will be aligned and b) it replaces the BB30 bearings so there is no interface to creak, hence why they call it a "convertor" rather than an "adaptor".
In order to remove the BB30 bearings, you'll first want to remove the adaptor: fingers crossed it wasn't bonded in by a previous owner, in an attempt to solve the creaking...
Scilly.Suffolk-
Yeah it's the same bike. I've seen the praxis works converter, and love the concept, I just don't love the price. Their website seems to hint that you shouldn't really attempt to replace the bearings in the converter, you should just replace the whole converter unit. Do you know of that's true, or once I've bought the converter can I just replace the bearings as they wear out?
hazzelfrazzel
Thanks so much for the resources, much appreciated!
To complicate matters, I took a look at the bb30 frame today. The token bottom bracket in it that came from the factory looks to basically be a reducer made of aluminium that is pressed into the frame, that then holds smaller bearing that allow the use of Shimano cranks. I've attached a photo of the bottom bracket with crank removed.
Should I a) punch the bearings out of the reducer and replace them with the same bearing type, or b) remove the whole unit and replace with a larger bb30 bearing kit like this and then a adapter like this?
Or does it not really matter? Neither seems like a great solution tbh