A friend of mine is confirmed clyde, and has been suffering from a recurring mechanical problem over the past year. I suspect two things... 1) that his LBS is worthless and has been trying to repair something that needs to be replaced, and/or 2) that his technique and stress on his equipment is causing the recurring problem. I feel bad because he loves to ride and you can see that his inability to finish chosen distances because of mechanical problems is killing him.
He runs a 'standard'(?) triple, and when he changes gears in the front, his chain will slip and get caught between the chainrings. He has had the bike into his shop getting repaired a few times, and I think they are not giving his problem the attention it needs because of the combination of his equipment and his stature. (He is riding a Giant OCR (of some sort) with standard equipment). It is so bad that he had to ride a 70 miler in just the granny gear.
Have any of you ever had this problem? Could it be caused by too much downward pressure on the pedals while shifting? (I haven't studied his technique, but he appears to pound pretty hard, particularly on a hilly course.) He is pretty strong and I was thinking that the force of his weight on the pedals coupled with his leg strength might be pulling the chain tighter during the shift than can be overcome by the derailleur.
Thanks in advance.