XxHaimBondxX

14t sprocket is chain skipping, could it replaced individually or if cost prohibitive, flipped? Would modern freewheel fit as replacement?

veganbikes

It is a freewheel and not really you may find old cogs maybe but the days of cog boards is loooooooooong gone so it would probably be more sensible and cheaper to just get a new freewheel. IRD makes some of the finest modern freewheels or Shimano makes some cheap-o stuff and there are others as well but IRD make quality stuff.

You could ask pastorbobnlnh,he runs the Freewheel Spa and may have parts or can refurb it.

oldbobcat

That's a freewheel, not a cassette. Aside from being filthy and rusty, and a bit of excess wear on the 14t cog. Clean it with solvent and drip some thin oil between the moving parts so it spins with a smile on its face. Look to your chain. Flipping chains is usless unless it's modern 10, 11, or 12-speed directional chain that was installed wrong. Is it worn or does it have a stiff or broken link? Or is it too long? Your local bike shop can get replacement freewheels (and chains) for $15-20, or you can order from online sources.

Trakhak

The previous owner may have been the kind of casual rider who shifted to the small ring/small sprocket the first day of ownership and then rode around in that combination exclusively, or almost exclusively. If that was the case for that bike, you can probably extend the life of the freewheel simply by using the larger chainring and one or another of the middle freewheel sprockets more often rather than the smaller chainring/smallest sprocket combination.

And if you're good at maintaining a fairly high cadence, the big ring plus second sprocket might be as high a gear as you'd usually need.

dedhed

Plenty of 14T Suntour cogs out there in the wild.
Can be replaced individually. Cost effective? maybe. Do it yourself? Maybe. Those are up to you.

https://www.ebay.com/sch/i.html?_fro...r+cog&_sacat=0

XxHaimBondxX

that's where I'm going, since it's for a flip. Question remains, are the threads on the hub from that era comparable to new stuff, diameter wise?

veganbikes

If they are standard English threads yes if not no but more than likely yes.

Andrew R Stewart 

IIRC this era ST freewheel w/o any other threading ID stamped on it will be an English spec, 1.370" x 24 TPI. Today's ISO (1.375" x 24 TPI) and earlier Italian (1.378"/35mm x 24 TPI) are generally interchangeable w/ the Eng spec. However it is best to not swap between these thread standards more than once. Andy

Kontact 

I've seen chainline issues with the current Shimano freewheels. If you're on a budget, get a Sunrace.

Andrew R Stewart 

I should have added why it's not best to swap between the threading specs I mentioned. Because the hub is the one of the long lasting components. The freewheel will wear from the chain/miles in time no matter what.

But it is the hub that will usually take the insults of class B freewheel fits. The freewheel core is a hard steel, the hub threads usually softer Al. You do that math... Andy

SurferRosa

Certainly depends on the bike, but it may not be worthwhile to purchase a new $20 freewheel (like a Sunrace 6-speed) for a flip. If you have a bike co-op, check there first.

XxHaimBondxX

set up appointment at one of our co-ops, they operate once or twice a month and for a couple of hours in the winter. thankfully, next appointment fell on next week.

I rode the bike with the same chain, but a different wheel and it rode fine.