Never seen before

[g-ratter]

This may be a pretty common thing but I have never seen it before. I was parting out some trash picked bikes when I came across this

Looks like a skip tooth mixed with a regular chain ring. Is this common and I just never noticed before?

 

[Jeff54]

A 1st on me too and think it's not a 'skip tooth' although skipped it does not look as if it's correctly spaced for a traditional 'skip tooth' but skipped because, it looks like it's spaced to size of standard chain, and it's a missing teeth because it's an 'cheaped tooth' chain ring.

Albeit, maybe made that way because they thought it would transition easier like that.

 

[g-ratter]

I see I accidently posted this in the wrong section. Should have been bike talk,ops!
It is off a Sears bike so cheap could be an explanation.

 

[pedals]

I have the same thing on a 70's AMF 10 speed

 

[GuitarlCarl]

I have seen this before and I don't know why they did it except maybe it made the chain pickup work a little easier when shifting gears...

Carl.

 

[LukeTheJoker]

It is meant to do with ease of shifting to and from the big ring, allows more angle offset between the teeth... As far as I understand anyway...

Luke.

 

[roadwarrior]

Also keeps the chain from getting excessive wear ,on the outer edge, when changing gears.

 

[A.S.BOLTNUT]

Rust , pretty Common....

~Rafael~

 

[outsider13]

could you run a skip tooth chain with that ? that would be different. just askin'

 

[deorman]

The spacing of the teeth on a 1" chain is not identical to skipping a tooth on a 1/2" chain. People sometimes people cut teeth from a 1/2" rear cog which sort of works because it only engages over a short distance. Even if the tooth spacing would work, the difference in thickness would make a 1" pitch chain sloppy and would probably eat it in short order.

 

[Wildcat]

I had a new 10 speed, from J C Penny, with that kind of ring. I think it was to save money by using less metal. That was one cheap bike, in every way.