Originally Posted by
oneclick
The type of chain most reluctant to get caught in those grooves is one withOUT beveled side-plates.
^^This kind of jibes with my own experience trying many (including 9s) chains on my Peugeot PH501.
The Sedisport chain is the correct one and I found none that worked quite as well.
The center-to-center cog spacing of nearly all Helicomatic freewheels is narrow, meaning that the Sedisport chain is also the oldest one to be found that will be narrow enough.
I took one apart and added bevels that mimicked Uniglide cog tooth features, but to little effect.
I ran one indexed on a Suntour Accu-7 equipped Cannondale R300, which did index effectively through six gears, but with too many "false-neutral" events for my liking.
EDIT: I seemed to only encounter slippage when shifting toward larger cogs, never in the other direction, and why I tried adding Uniglide-style "twist" bevels to the tips of the teeth.
A woman rider once almost fell off her bike when she was riding close behind while I suffered gear slippage and lost all drive while shifting for a steepening grade.
After that occurrence, I replaced the Peugeot's rear wheel with a similar but Shimano freewheel-equipped wheel that I had sitting around, and the bike's Huret-controlled shifting is now quite excellent.
