Hello!

I am attempting to use a Shimano RSX (600) front derailleur and brifter with a SunTour Cyclone double road bike crank.

I have moved the front derailer to be about 2 mm above the largest chainring, and adjusted the low stop so that shifting down to the small ring works fine.

Shifting up is more of a problem.

If I adjust the high stop and the cable tension so that I can actually shift onto the big ring (52 tooth, no ramps), it sometimes overshoots and the chain falls off.

If I adjust the high stop so it never falls off, it also won't shift into the big ring.

It NEEDS a bit of over-shoot for the chain to grab the big chainring.

There seems to be no in-between.

Would using a Shimano crankset make a difference? Do I need new chainrings? The chain is new.

Thanks!
-Jim

P.S. Sorry I used the word "brifter".