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This is the GXP version. The Praxis Converter BBs are good. They screw together so don't creak. I used one on @Cycliste's Supersix (RIP) and it worked well.
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If you want a permanent solution, I have an FSA press in threaded sleeve (which can actually be pressed out so isn't permanent). You'd need some loctite 609
Otherwise Wheels Mfg work fine
https://www.sigmasports.com/item/Wheels-Manufacturing/BB30-to-SRAM-Adapter/TXB
what is the @mdcc_tester or anyone else knowledgeable solution for using a gxp chainset in a BB30 frame (other than not lining the pockets of people who make BB30 frame sets)...
its been suggested that the Cbear bb30 to gxp is the best option, but at £95 it seems like an expensive solution to the problem.