Hello! This may need to be in the mechanics sections, but, it is probably an easy answer for you guys. I have n 08 Fuji Roubaix Pro that I enjoy a great deal with the exception of continuously dropping the chain. It typically happens when shifting from the small chain ring to the larger, but, it has happened when shifting to the lower as well. If I really concentrate on it and take it real easy when shifting to the larger ring it will go successfully. This is very aggravating and am hoping you guys can give me some pointers.

Recently had a tune up around 100 miles ago and it is still doing it...keeping the chain clean and lubed. Chain seems to measure the correct length (should have been noticed in the tune up if not). Willing to get a new chain or whatever it takes. Thanks in advance from my left index finger and thumb covered in oil.