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#1
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slipping chain at same spot (and only that spot)
Chums
I'm perplexed. There's one spot on one of my regular routes, when having come up a hill and around a bend, it's the right time to slip up onto the higher of my two chainrings and give it a bit of wellie on the flat. This is something I do, of course, quite regularly, and without any problem on any number of occassions on this route and other routes. But on this one specific spot, when I do it, the chain slips off. Always. Now, of course, the answer is to wait a bit before changing gear, but I'm intrigued as to why it should just happen on this spot and nowhere else? Any ideas? Road surface? Deceptive and still on an upslope? M |
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#2
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slipping chain at same spot (and only that spot)
Maurice W wrote:
Chums I'm perplexed. There's one spot on one of my regular routes, when having come up a hill and around a bend, it's the right time to slip up onto the higher of my two chainrings and give it a bit of wellie on the flat. This is something I do, of course, quite regularly, and without any problem on any number of occassions on this route and other routes. But on this one specific spot, when I do it, the chain slips off. Always. Now, of course, the answer is to wait a bit before changing gear, but I'm intrigued as to why it should just happen on this spot and nowhere else? Any ideas? Road surface? Deceptive and still on an upslope? For whatever reason, you don't change gear with as much force while pedalling with that certain cadence and torque elsewhere. Anyway, your derailleur needs adjusting. I know that's easier said than done sometimes, but still it should be possible to improve it. Pay attention to the angle and height as well as the limit screw. ~PB |
#3
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slipping chain at same spot (and only that spot)
Maurice W wrote:
Chums I'm perplexed. There's one spot on one of my regular routes, when having come up a hill and around a bend, it's the right time to slip up onto the higher of my two chainrings and give it a bit of wellie on the flat. This is something I do, of course, quite regularly, and without any problem on any number of occassions on this route and other routes. But on this one specific spot, when I do it, the chain slips off. Always. Now, of course, the answer is to wait a bit before changing gear, but I'm intrigued as to why it should just happen on this spot and nowhere else? Any ideas? Road surface? Deceptive and still on an upslope? M Probably a bump in the road just right to send a horizontal wave in your chain, at a time when you don't have much tension on it -- /Marten info(apestaartje)m-gineering(punt)nl |
#4
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slipping chain at same spot (and only that spot)
in message , Maurice W
') wrote: I'm perplexed. There's one spot on one of my regular routes, when having come up a hill and around a bend, it's the right time to slip up onto the higher of my two chainrings and give it a bit of wellie on the flat. This is something I do, of course, quite regularly, and without any problem on any number of occassions on this route and other routes. But on this one specific spot, when I do it, the chain slips off. Always. Now, of course, the answer is to wait a bit before changing gear, but I'm intrigued as to why it should just happen on this spot and nowhere else? Any ideas? Road surface? Deceptive and still on an upslope? What gear are you in at the back at the time? Some setups are a little intolerant to shifting onto the big ring when already on a small cog at the back. The answer, of course, is a trimmable front shifter, but on many Shimano groupsets this isn't available. And it's also possible to shed a chain with even a well tempered setup if you shift both shifters at the same time - a thing I tend to do. -- (Simon Brooke) http://www.jasmine.org.uk/~simon/ ;; Semper in faecibus sumus, sole profundum variat. |
#5
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slipping chain at same spot (and only that spot)
On Fri, 01 Jun 2007 20:37:00 +0100, Simon Brooke
wrote: What gear are you in at the back at the time? Some setups are a little intolerant to shifting onto the big ring when already on a small cog at the back. The answer, of course, is a trimmable front shifter, but on many Shimano groupsets this isn't available. I'm generally in 5th out of 8, and it's a sweet change the rest of the time, so I reckon it must be a bump or such in the road, as the other poster suggested. I'll not change gear next time I'm there,and keep my eyes peeled, and ******** primed to spot any bumps... M |
#6
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slipping chain at same spot (and only that spot)
Maurice W pretended :
Chums I'm perplexed. There's one spot on one of my regular routes, when having come up a hill and around a bend, it's the right time to slip up onto the higher of my two chainrings and give it a bit of wellie on the flat. This is something I do, of course, quite regularly, and without any problem on any number of occassions on this route and other routes. But on this one specific spot, when I do it, the chain slips off. Always. Now, of course, the answer is to wait a bit before changing gear, but I'm intrigued as to why it should just happen on this spot and nowhere else? Any ideas? Road surface? Deceptive and still on an upslope? The other replies indicate reasonable possibilities, and I can't add much else. However, from your new thread (1000 miles in 2007...but...) it's clear that you're in my area (I live in Castle Hedingham and commute to Tiptree). Where is the fabled bend on the hill? I'd be interested to know, and perhaps I might even be able to add some extra comment! -- Simon |
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