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Re: Cannondale Eccentric Bottom Bracket Removal

Posted By: Andy Hyde
Date: 1 April 2005

: There are two main ways I know.

: 1) Undo the M5 bolt (the one between the two holes) a little bit (3mm?) then
: hit it (hammer+punch?) to release the wedge. Then undo completely, pushing
: the wedge out as you go, if you want to remove rather than just adjust.

: 2) Take the M5 bolt out completely, then put another one in from the other
: side, with a big washer, such that the washer holds aganst the frame and
: lets the bolt pull the wedge out. I do this with the same bolt, and a nut
: to push against the washer (ie my extraction kit consists of a washer and
: a nut and an 4mm allen key)

: To adjust, it doesn't need removing. Some people use pin spanners to turn
: them, I use an allen key in one of the holes, and push one of the cranks
: against it to turn the entire thing.

: Have a look at the tandem@hobbes archives for discussion on this too.

: cheers,
: clive

I've done the same thing (using an allen key) and was able to adjust my timing chain quite easily. I think the key is to make sure the eccentric moves easily in the bottom bracket.

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