On going chain problems
Other than my road bike having a ghost or my bike being sabotaged while left at work I and my local lbs have run out of ideas while I am getting this issue . I keep constantly having issues with chain coming off!! Had no problems until I had bike serviced ( not been to that lbs since) . Gear is changing fine then suddenly just throws off the chain. Initially was always on inside but now is coming off to the right on big ring. Each time has come off I have either got sorted road side myself, a friend has sorted or taken to local lbs. Has been in perfect working order then goes again. The chain and cassette is quite new and both are fine, derailleur looks fine, new cables. LBS were so fed up last time they stripped bike down for me and did a full check, they assured me it was 100% spot on. I rode straight from there to work( 1 mile). After work rode 3 minutes down road, tried to change into big ring and chain came off again. I did wonder if I was somehow catching cage with my heel when riding or unclipping but last few rides have got someone to watch and I amnowhere near. I having been riding many years ( qualified cycling coach)so am changing gear correctly. There is just no reason I or lbs can come up with other than someone is messing with it while is in bike store at work. Any other thoughts.