Hi, I'm trying to find out what freewheel I can replace a Suntour winner/new pro with. The bike is all Suntour Edge, 6-speed Indexed-Accushift and oval chainrings (not sure if it's relevant to rear derailleur or not) and is pretty nice to ride, though it's rather highly geared.
The freewheel has a broken sprocket, the very first one which is also a lockring. Broken as in it's split and just spins if any load is put on it.

Anyway there are plenty of 6-speed freewheels out there, but all the new ones seem to come with 28t as the big sprocket. The one currently on there is about 19 or 20 (haven't got it with me) max. What I would like to know is if the derailleur can handle a large rear sprocket or if I need to keep it small and just look for a replacement sprocket. The bike is quite highly geared so I'd rather be able to replace it but if I can't well it's no big deal.
I found this page http://www.worthpoint.com/worthopedi...ur-7-117470766 which seems to discuss the correct derailleur, but I don't necessarily trust that as it's from an auction.

Has anyone encountered this?