How to adjust the eccentric bottom bracket on a 2008 Dawes Duet Tandem.
It is technically a Pinch Bolt Eccentric.
Beneath the Captain’s crankset there is a bulbous projection.
Within that are two 6mm Allen bolts.
Loosen them, note they are quite tight, fully off.
On the drive side of the eccentric bb housing there is a hole suitable to hold a 5mm rod, insert a suitable rod in the hole and use this to rotate the eccentric shell either clockwise or anti-clockwise. As the bottom bracket moves towards the rear of the shell the timing chain will loosen, as it move towards the front of the shell the timing chain will tighten.
Adjust until there is some vertical play in the timing chain. Mine was shipped very tight; less than 1mm vertical play, so I loosened it and now it has about 3 mm vertical play.
Retighten the 6mm Allen Bolts to around 10 – 12nm, I used a torque wrench at home, but on the road you would feel that as quite tight.
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