I'd like some help identifying the type of free wheel that's this 1983 Trek 620 that I recently purchased. The '83 620 is on the lower end of the spectrum for this model, but this bike has a 24" frame that fits me very well. Also, I couldn't resist the Grab On handlebar foam grips.



According to Trek brouchures I've seen, the bike came with an Atom Helicomatic 6 speed 13-28 free wheel, which doesn't appear to be what's on the bike now.



Can you tell me whether this is a suitable free wheel for touring . . . it rides great so far, but I haven't had it out with a load, yet. Also, is there anyway to tell from these pictures whether the bike retains its Heliocomatic hub? I've seen posters decry this type of hub and would like to know if I may need to replace it.



Thank you.