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Chain jumping off

Out this morning on the bike when changing from the big ring to the small ring in gear 3 or 4 the chain was coming off the bottom jockey wheel, anyone offer any help as to why this is happening, bike has 11 speed Ultegra.



https://www.instagram.com/seanmcgrathphotography/
Planet X RT58
Cannondale CAAD 10 2012.
Pain.. Is weakness leaving the body.

HATING LIFE-CYCLES FROM 2011

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