What's this little doohickie for on a mid-1980's (I think) Miyata 310?
 

I've been working on this vintage Miyata 310 and noticed this projection on the rear stay.

There's only one. None on the contralateral stay.https://cimg0.ibsrv.net/gimg/bikefor...1da30fcecd.jpg
https://cimg4.ibsrv.net/gimg/bikefor...558dd2e461.jpg


See photos.

It is a chain hanger for removing the rear wheel when changing a flat tire or removing the wheel for other reasons. Smiles, MH

Thanks!

What a great idea! What will they think up next?

Maybe threaded bottom brackets???

As mentioned a chain peg but IMO on the wrong tube. Andy

https://cimg8.ibsrv.net/gimg/bikefor...1692dead24.jpg

That’s a very strange place for the “chain peg” IMHO too but could allow for letting the chain settle on the small cog before pulling the axle up into the vertical dropouts :foo:.

Your fingers stay cleaner w/ the location on Andy's frame.

This question pops up about once every 1.5 years. Back in 2017 it was my turn to ask.


https://www.bikeforums.net/classic-v...0841-what.html

Mine too is on the seat stay and you have to get your fingers dirty to use it. Seems the like lower on the stay would be better so you can snag it while dropping the wheel. Or as others have theirs, on the chain stay. I've never used one though.

I guess I could remove it and save some weight! <grin>

It’s bent!

These seat stay located chain pegs are often bent and/or really scrapped up as many forget to remove the chain from the peg before trying to ride off.

The chain stay located versions are positioned so that the chain falls onto them during wheel removal (chain on smallest cog) and then holds the chain "open" to receive the small cog on reinstalling the wheel. No hands and auto correcting. I got the idea form the 1973? Fuji Finest which had a clamp on chain stay cable stop with a fin running across the stay and under the chain. Columbine later offered a braze on chain peg (although more like a shelf as it was a stamped and bent piece of steel). Andy

That peg might lend the excuse to use a sealed ceramic bearing cartridge....

Knowing some manufacturers, that "sealed cartridge" might be designed into the frame & somehow integrated into the der hanger as a nonreplaceable item. Need to replace that high speed peg? No problem! $4,000. or a new like replacement bicycle.... $4,195.85.

I agree on how it could get bent. I never really found them to have much utility. I’ve only had a few bikes with them and never really used them.

i agree. Kinda like MS Excel. A lot of very helpful functions, but it's only used for the basic functions.. like playing Ski Free.

Thanks for all the great info, gents!

I had no idea how that could have gotten bent.