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What is the purpose of this ring on my chainstay?

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What is the purpose of this ring on my chainstay?

Old 12-17-21, 11:21 AM
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robertj298 
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What is the purpose of this ring on my chainstay?

I've never had one on any of my other bikes.
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Old 12-17-21, 11:42 AM
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Chainstay protector, to help keep the chain from slapping the paint.
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Old 12-17-21, 01:20 PM
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Originally Posted by robertj298 View Post
I've never had one on any of my other bikes.
Now that we have that sorted lets see the rest of that frame plz, rear dual eyelets, CS loop, cool looking panto?

More pics plz, or link if I missed it.
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Old 12-17-21, 01:40 PM
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Should be something forward to sling a strap between
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Old 12-17-21, 02:11 PM
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Originally Posted by repechage View Post
Should be something forward to sling a strap between
That's a different type of brazed on bit. I think you're thinking of something like this:


Slotted tubing bits brazed on

The chainslap rubber protectors can either slide into a slotted tube as shown above, or slide onto a bit of solid rod bent up and around (they have a small hole through both ends). I can't find a pic of the 2nd method, but it's very similar to the OP's pic, except it's open on one side (doesn't loop around and get brazed at both ends).

The OP's protects the chainstay with one brazed on loop. Another classic way that used to be found is to carry spare spokes on the chainstay.



I've done two of those methods. The braze ons for the spoke method are available at framebuildersupply.com A small slice of tubing is used for the other method I showed, above.
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Old 12-17-21, 03:05 PM
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Hey the spare spokes thing is pretty trick, never seen that before
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Old 12-17-21, 03:18 PM
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On the Gran Tourismo maybe? Chainstay protector as others have said. A surprisingly overbuilt solution to something a plastic sleeve would do. I have one on my 89 Miyata 1000. Actually, it is a good mechanics reminder of how good your “slack” setup is.

My 1000 had the oval Biopace rings, and obviously the oval 28t inner would noisily bounce off that with too much chain slack, or if one was cross chaining. Annoyingly, on that small 28t it would clatter unless in the 3 largest rear sprockets. Forget running a 24t or 26t front ring.

Being old and weak, I wanted some lower gearing on this bike. Switching to a round 24t and paying attention to chain length, I was able to use the largest 4 or 5 sprockets on the rear with no noise from the chain bouncing on that protector. In my case it served as a confirmation of proper setup. As a side note, those Biopace rings really make the chain bounce when on the smallest sprocket.
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Old 12-17-21, 03:24 PM
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Originally Posted by sd5782 View Post
On the Gran Tourismo maybe? Chainstay protector as others have said. A surprisingly overbuilt solution to something a plastic sleeve would do. I have one on my 89 Miyata 1000. Actually, it is a good mechanics reminder of how good your ďslackĒ setup is.

My 1000 had the oval Biopace rings, and obviously the oval 28t inner would noisily bounce off that with too much chain slack, or if one was cross chaining. Annoyingly, on that small 28t it would clatter unless in the 3 largest rear sprockets. Forget running a 24t or 26t front ring.

Being old and weak, I wanted some lower gearing on this bike. Switching to a round 24t and paying attention to chain length, I was able to use the largest 4 or 5 sprockets on the rear with no noise from the chain bouncing on that protector. In my case it served as a confirmation of proper setup. As a side note, those Biopace rings really make the chain bounce when on the smallest sprocket.
Never liked the plastic sleeve, seen most of them slide around, hack paint with grit trapped inside and become unsightly in general.

Wouldn't even want to snap one on a good paint job.
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Old 12-17-21, 03:34 PM
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Knowing the purpose of the ring, this is what came to mind when I read the thread title.

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Old 12-17-21, 08:34 PM
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Originally Posted by merziac View Post
Now that we have that sorted lets see the rest of that frame plz, rear dual eyelets, CS loop, cool looking panto?

More pics plz, or link if I missed it.
These were before I cleaned it all up


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Old 12-17-21, 08:59 PM
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Itís for a tow rope
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Old 12-17-21, 10:23 PM
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Heck, the maker is expecting that wire form to protect the whole chainstay from chain slap.

better than nuthiní
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Old 12-17-21, 10:30 PM
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It’s an homage to French constructeurs.
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Old 12-17-21, 10:37 PM
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Originally Posted by nlerner View Post
Itís an homage to French constructeurs.
Actually it's for towing French bikes that have broken down
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Old 12-18-21, 12:41 AM
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