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You need grease in there to protect the bearings from the elements, IMO. I think that all EBBs slip eventually, it's just some slip faster than others. The Origin8 wasn't too bad, it probably needed adjusting every few weeks, but it's a bit of a faff as you have to remove the non-drive side crank to retension the chain. That's also a ball ache when you get to a race and decide you need to change gear, which normally means changing the chain length too.
andyp
@Borek
It's creaking i'm concerned about, I assume they have to be fitted without grease to stop them spinning around in the frame?