Technical > Transmission

Eccentric BB setting when fitting a new chain?

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rafiki:
I shall be fitting a new chain to my Sterling soon. When I do is there a specific position the eccentric BB should be moved to before fitting?

Dave Whittle Thorn Workshop:
All the way back so the distance between the axle and bracket center is as short as possible

rafiki:
Just looking at it now Dave. Not sure how I know it is all the way back. I don't see a mark.

geocycle:
I always start with the thinnest part of the BB pointing along the chain stay so the distance from the BB to the hub is as short as possible.  The chain should be slack. Then when the chain is on I rotate the BB so the thick side of the BB moves toward the chain stay and the chain will tighten.  Moving the BB effectively increases the distance from BB to hub and tightens the chain.

Donerol:
It depends on the chainstay length and the number of teeth on the chainwheel and sprocket, though. On my particular set-up I can't exploit the full adjustment potential of the eccentric.

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