With my K2 I never had bearing issues. I would assume the same with the revo, but not 100%. I know one of the mags just did a race revo and it had 40 bow ties on it.

If you are looking into getting 23mm adapters get the dace ones, they use a more commonly found 22mm socket. Yo can get them at www.amainhobbies.com for like $39 I think, much better than the prolines, because the dace actually still use the hex nut, where pro-lines do not.