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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
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hazzelfrazzel
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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
Firstly, some references for you:
The obvious difference between BB30 and BB86, is that with BB30 the bearings are pressed directly into the frame; with BB86 the bearings are pressed into cups and the cups are pressed into the frame.
Also BB30 is natively for 30mm diameter spindles and BB86 for 24mm spindles.
The X-Tools tool will install both as it has adaptors to cope with the different internal diameters of the bearings and the cups.
But you will need both the other tools to remove them: not only are the diameters different, but with BB86 the shell guides the tool; with BB30 there is no guide for the tool.
Personally, I find Park Tool overpriced for what they are: Cyclus are my "nice but pricey" choice.