Originally Posted by
dddd
Only the 7s Accushift has it's own proprietary cog spacing, and a 7s Sunrace freewheel might work well enough if a floating top pulley is incorporated.
The spacers between the bigger cogs of a Shimano cassette can be narrowed the necessary .2mm with good accuracy using a sheet of sandpaper with the uniformity of thickness monitored using a digital or dial caliper.
I wouldn't expect the 7s Sachs/Maillard freewheel to work great with 7s Accushift but I haven't actually tried it. The Alpha freewheels famously can transmit pedaling force during shifts if a modern chain is used, their predescessor NW freewheels not so much and I've modified teeth on the latter to eliminate chain "skating" or slippage during shifting.
The Sachs/Maillard freewheel works MUCH better than the Alpha on my Accushift '90 C'dale Black Lightning. I believe the chain is the original SunTour item. Works great.
On my GPX '89 Ironman, I ran the SunRace 13-25 with an original, unmodified RD and shifters and that worked great as well. That rig had a KMC X-series 8 speed chain. Both indexed perfectly under load.
[MENTION=108582]RobbieTunes[/MENTION] understates the sound signature of GPX/Accushift. It's more like 'click...clack...THUNK!".
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