New Chain skipping on old freewheel
I got an old Schwinn 10 speed touring bike last year and have been using it for daily commuting and for some light sport touring. I love it. I've been trying to stay on top of maintenance because the bike has a very nice vintage Dura-Ace drivetrain, I like the way it works and I don't want to have to replace it. I've kept an eye on chain wear. My old chain had not yet worn as much as 1/16" in a foot by my measurement. I was hoping if I continued to change the chain in a timely fashion that I'd be able to keep using my very cool, magically silent, skiptooth-big-cog, Shimano model J freewheel indefinitely. I changed the chain last night, though and when I got on it this morning it was skipping badly on my most used middle cog and skipping a little on the 34T skiptooth cog and I didn't really shift around a lot or try it extensively, but I'm bummed that it seems to be worn beyond help.
I guess at this point I can just put the old chain back on and use the chain and freewheel until it won't drive no more and then replace everything. Just wondering if there's anything I can do to prolong the life of my freewheel at this point.
Also, have considered getting a new 5 speed IRD freewheel and using it with the new chain to try to preserve the life of my beauteous Dura-Ace chainrings. The IRD freewheels look nice, but I've seen mixed impressions of the quality/durability.
What would you do?