Originally Posted by
Leisesturm
Not really the issue, 'centering' is a completely different beast from 'chain slack removal'. An idler system or an eccentric BB only address the chain slack. Like others we have noticed a degree of cyclic increase/decrease in timing chain tension which could likely be reduced/eliminated by either Sheldon's or the o.p.'s centering procedure but... I haven't bothered. Hasn't been an issue. FWIW.
H
True - the idler adjustment does only address general chain tension. Easier than adjusting an eccentric BB. Probably easier to fine tune than an eccentric BB. I'll have to reconsider how this relates to the not-quite-centered synch ring issue.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer