Originally Posted by
pastorbobnlnh
I'm having this same trouble with my '71 Paramount. I'm running a Suntour 6 speed ultra spaced freewheel. Originally it was a problem with the Rally RD. So after cleaning last week and upon reassemply I decided to mount a Sachs-Huret Eco Duopar RD. Same problem (at least on the stand). I can manually tug on the RD, pulling it outward, and the chain drops to the smallest cog and stays. But only about 10-20% of the time would it shift to the smallest cog without me intervening.
Any ideas?
All straight-parallelogram RDs are prone to this. I've resorted to backing off the low limit stop on these RD's just enough so that the derailer has an opportunity to overshift onto the lowest cog - but not enough so that it overshifts into the gap between the dropout and the cog.
-Kurt