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Chains, Rollers, Stretch, Checkers, "chain ring test"
not meaning to start another big debate, but i have read and read and i
still don;t get it chains, roller wear, stretching here is my case i have a plain shimano 7/8 speed chain, hyperglide, totally stock no quick release links i;ve been riding it for 10,000+ miles it shifts perfectly well i had been measuring it with a tape measure it usually measured .35-.45/16" 'stretch' i even stretch the section i am measuring tight via bungee cords to the pedals i thought, well, that is ok, it seems remarkably long lived, but maybe i just ride lightly, or my extremely casual cleaning technique works i got a chain checker that is where the trouble started the first thing i noticed was that many sections of chain would measure fine but some would indicate more than 1% worn closer inspection revealed that some of the rollers are very loose on the pins also, they have a sort of spinal-disc shape instead of being flat, they are smaller in the center than the edges then i started trying to read this group and figure out what to do which of course didn;t help, too much conflict and 'dunno' one test i did, was to stretch the chain tight, and see if it engaged all the teeth on the chain ring it doesn;t it acts like a chain that is too long the top of the chain will be in the valleys, but as it progress down to the floor, it starts to rise up out of the valleys which makes me think it should be replaced, but it;s not too long, and the R.B.T. wisdom [some of it] said 'roller wear doesn;t matter' so does it or not? is the chain ring test the be-all and end-all? i;ve never seen it recommended by anyone wle. |
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#2
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Chains, Rollers, Stretch, Checkers, "chain ring test"
wle wrote: not meaning to start another big debate, but i have read and read and i still don;t get it As intrigueing as this is, let's leave it to Captain Brown to answer. Come on , Sheldon, show us the way once again! Sergio Pisa |
#3
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Chains, Rollers, Stretch, Checkers, "chain ring test"
On 30 Oct 2006 08:28:12 -0800, "wle" wrote:
not meaning to start another big debate, but i have read and read and i still don;t get it chains, roller wear, stretching here is my case i have a plain shimano 7/8 speed chain, hyperglide, totally stock no quick release links i;ve been riding it for 10,000+ miles it shifts perfectly well i had been measuring it with a tape measure it usually measured .35-.45/16" 'stretch' i even stretch the section i am measuring tight via bungee cords to the pedals i thought, well, that is ok, it seems remarkably long lived, but maybe i just ride lightly, or my extremely casual cleaning technique works i got a chain checker that is where the trouble started the first thing i noticed was that many sections of chain would measure fine but some would indicate more than 1% worn closer inspection revealed that some of the rollers are very loose on the pins also, they have a sort of spinal-disc shape instead of being flat, they are smaller in the center than the edges then i started trying to read this group and figure out what to do which of course didn;t help, too much conflict and 'dunno' one test i did, was to stretch the chain tight, and see if it engaged all the teeth on the chain ring it doesn;t it acts like a chain that is too long the top of the chain will be in the valleys, but as it progress down to the floor, it starts to rise up out of the valleys which makes me think it should be replaced, but it;s not too long, and the R.B.T. wisdom [some of it] said 'roller wear doesn;t matter' so does it or not? is the chain ring test the be-all and end-all? i;ve never seen it recommended by anyone I think that what you've got is a system that has worn itself to match over way too many miles of usage; at this point, I doubt that replacing the chain alone will achieve anything other than making the wear to the sprockets obvious. The mere fact that your description pretty much confirms that the rollers are shot (which does change the effective spacing when under load) is enough to verify that there's a lot of wear, and sooner or later this will result in a failure. It might happen in any number of ways, but the only certainty is that it *will* happen. As for why the measurements aren't revealing any significant wear, I can't say; I'm not there to look at the way the numbers are being obtained, so I have to take your word for it that they are accurate. In your situation, I would replace no single component immediately, but I'd begin shopping for replacements for the cassette or freewheel, the chain, and the front sprockets right away; when they're all in hand, replace them as a group, and it should work like new again. In the meantime, if your riding style isn't causing wierd shifting, chain skipping and the like, smile and cautiously ride on. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
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Chains, Rollers, Stretch, Checkers, "chain ring test"
The mere fact that your description
pretty much confirms that the rollers are shot (which does change the effective spacing when under load) is enough to verify that there's a lot of wear, and sooner or later this will result in a failure. so, you are saying that roller wear has a limit a. what is the limit then? b. other experts said, the only thing that matters is chain pitch, and roller wear doesn;t affect that wle. |
#5
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Chains, Rollers, Stretch, Checkers, "chain ring test"
In article .com,
"wle" wrote: so, you are saying that roller wear has a limit a. what is the limit then? Well, theoretically you could run the chain until the bushing and pin wear is so much that the chain breaks under load. b. other experts said, the only thing that matters is chain pitch, and roller wear doesn;t affect that Chain wear results in the distance between the pins increasing, which increases the pitch. Pictures are worth more than words in this case. Hopefully this will help: http://pardo.net/bike/pic/fail-004/000.html |
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