Bicycle Mechanics - front derailleur

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workout
09-21-08, 06:58 AM
I have a Santana tandem with a shimano derailleur and ultrgra shifter. When I am on the large sprocket and want to go to the middle it will fall to the small and I will have to come back up to the middle. What adjustment would take care of this problem? Could there be a problem in the shifter?

onbike 1939
09-21-08, 07:43 AM
You may find that the "H" screw needs backing off a bit. It may change to the large chain-ring but because this requires too much tension on the cable, when moved to the middle it will spring back further than the middle and go to the small chain-ring.
If this doesn't work then clean and lube the FD, making sure it moves smoothly over its whole range of travel.
operator
09-21-08, 07:48 AM
I have a Santana tandem with a shimano derailleur and ultrgra shifter. When I am on the large sprocket and want to go to the middle it will fall to the small and I will have to come back up to the middle. What adjustment would take care of this problem? Could there be a problem in the shifter?

Do the whole procedure

http://www.parktool.com/repair/readhowto.asp?id=75

I'm going to assume you're talking about the front chainrings about this problem.