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
I wouldn't recommend the the FSA sleeve - I had it on a CAAD track +omniums and it creaked like rocking chair. Swapped it out to praxis BB30 - > GXP and it's been perfect for 18 months.
@timmah! started
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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