What is the purpose of this ring on my chainstay?
12-17-21, 11:21 AM
#1
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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.
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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12-17-21, 01:20 PM
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12-17-21, 01:40 PM
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Should be something forward to sling a strap between
12-17-21, 02:11 PM
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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.
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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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.
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.
12-17-21, 03:24 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.
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.
Wouldn't even want to snap one on a good paint job.
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.
12-17-21, 08:34 PM
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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 nuthin’
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12-17-21, 10:30 PM
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It’s an homage to French constructeurs.
12-17-21, 10:37 PM
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12-18-21, 12:41 AM
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