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chain drops during xc
I've got chain-drop problems even every setting is right.
The chainline, shift-mech, chain lengh are all correct and function normal during the ride. However, during the downhill session, the chain often drops inward to the frame. I tried set the RD cage at higher tension, no use. Also I tried shift the gear to the middle while riding, the chain still falls. Can anyone help? |
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#2
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chain drops during xc
On Nov 2, 7:55*am, Luke Forward wrote:
I've got chain-drop problems even every setting is right. The chainline, shift-mech, chain lengh are all correct and function normal during the ride. However, during the downhill session, the chain often drops inward to the frame. I tried set the RD cage at higher tension, no use. Also I tried shift the gear to the middle while riding, the chain still falls. Can anyone help? Is this during a shift or just out of the blue when descending? If out of the blue, I think the mountain bike people need to chime in, because to me (a mostly roadie), it would be caused by a momentary slackening of the chain along with an impact sufficient to dislodge the chain from the chain ring -- but modern rear suspension (which I assume you have) does not change chain line length when the suspension is compressed. Slack n'whack -- but where is the slack coming from? If this is happening during a shift, you can get uneven shifting if you have cable stick or lack of lubrication in the FD, so apart from checking your FD adjustment, make sure it is lubricated, and the cables are lubricated.I suspect, though, from what you say this is not the problem. -- Jay Beattie. |
#3
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chain drops during xc
Luke Forward wrote:
I've got chain-drop problems even every setting is right. The chainline, shift-mech, chain lengh are all correct and function normal during the ride. However, during the downhill session, the chain often drops inward to the frame. I tried set the RD cage at higher tension, no use. Also I tried shift the gear to the middle while riding, the chain still falls. Can anyone help? Good idea to be in big ring on true descents. Also, try removing a link (make sure to accommodate cross-chain scenario though). Bill S. |
#4
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chain drops during xc
On Nov 2, 10:55*am, Luke Forward wrote:
I've got chain-drop problems even every setting is right. The chainline, shift-mech, chain lengh are all correct and function normal during the ride. However, during the downhill session, the chain often drops inward to the frame. I tried set the RD cage at higher tension, no use. Also I tried shift the gear to the middle while riding, the chain still falls. Can anyone help? Sounds like the inner stop on the FD could use a small tweak, or perhaps the chain could be a touch long. I wouldn't be as quick as jay to assume you have rear suspension, based on the XC mention. Is the bike FS, or hardtail? Have you worked with the front derailler inner stop? How much chain is on there? Can you (of course you wouldn't, but for the sake of conveying chain length) be on the big ring and the large rear cog at the same time? If so, how much slack is left? I've seen this issue when the chain is too long in the past. If you have any slack when on the large rear cog and large chain ring, I'd say the chain is too long. You shouldn't use that combo anyway, of course. The only reason to even have the chain long enough for that to be possible is in case you accidentally switch into that combo, so you don't bind the chain. My XC bike has a chain that won't allow that combo to be used, and trying to do so will bind the chain. It also has a larger-than-normal gear range, and running the chain any longer results in slack on other, usable gear combos, so I run the chain shorter and avoid using the large/large combo, which as mentioned shouldn't be done anyway. Another helpful thing to know would be if this is happening pedaling or coasting. I assume the latter, since it's unlikely you'd be on the small chain ring while pedaling downhill. I tend to be on the middle or big ring on descents, depending on what is at the end of the descent. |
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chain drops during xc
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