Bike Commuter in training
Join Date: Aug 2009
Location: Alexandria, VA
Bikes: '77 Centurion Semi-Pro, '88 Fuji Saratoga, '12 Jamis Sputnik, '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc
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If your bike has the SunTour accushift compatible freewheel cogset (early 1990s?) and indexing SunTour shifters, then you must stay with SunTour derailleur to maintain the proper relationship between shifter pull, derailleur travel, and cog spacing.
If you have thumb shifters running in friction mode, then it doesn't matter - any derailleur that is rated for the overall capacity range [(front outer teeth - front inner teeth) + (rear inner teeth - rear outer teeth)].
So, what are the make(s) of your shifters and rear cogset (freewheel or cassette)? PG