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@mi7rennie
Also a question, we built my brothers bike for the event (On-one 45650B) and he was having a lot of problems with the chain jumping off at the front when shifting down to the small ring (2X front setup).
We fitted the bike with this derailleur http://www.chainreactioncycles.com/shimano-xt-m786-conventional-2x10-front-mech/rp-prod67203
It seemed fine at the start of a lap but as it got muddy it just stopped working!