Originally Posted by
mr. dolphin
the chain falls between the gears on the crank when I downshift from the large gear to the small one.
Here is a laundry list of things that would help:
What front crankset are you running?
What chain are you running? Is it a new replacement, and if so, was it a Shimano-compatible "9-speed" or "10-speed" chain?
Are the bolts that hold the chainrings to the crankset flush with the ring, or do they stick out?
-Kurt