Broken Chain
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Broken Chain
Postby r11ss » Tue Nov 05, 2013 9:29 pm
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Re: Broken Chain
Postby Percrime » Tue Nov 05, 2013 9:32 pm
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Re: Broken Chain
Postby QuangVuong » Tue Nov 05, 2013 9:33 pm
If not, then try using a non hollow chain. Hollow chains look cool and save weight, but are relatively weaker.
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Re: Broken Chain
Postby r11ss » Tue Nov 05, 2013 9:33 pm
"https://www.dropbox.com/s/fv30t67zzp3bf ... HDR%29.jpg"
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Re: Broken Chain
Postby r11ss » Tue Nov 05, 2013 9:51 pm
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Re: Broken Chain
Postby Duck! » Tue Nov 05, 2013 9:52 pm
Are they breaking where you joined them? If so, you may have an incompatible chain tool which doesn't brace the back of the link sufficiently (due to being too wide for the chain) when the pin is pushed in.
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Re: Broken Chain
Postby r11ss » Tue Nov 05, 2013 10:18 pm
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Re: Broken Chain
Postby jacks1071 » Tue Nov 05, 2013 10:46 pm
Try to change gears in the deadspot of the power stroke and/or back the power off when shifting.
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Re: Broken Chain
Postby biker jk » Tue Nov 05, 2013 10:59 pm
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Re: Broken Chain
Postby human909 » Tue Nov 05, 2013 11:10 pm
A poorly set front derailleur can easily strip a plate and break a chain. If it is too low on the the tube shifting might be fine but it could set up the conditions for a plate strip. This occurs from a scissoring action between the derailleur, the chain wheel and the moving chain. The chain can break even under relatively moderate load.
That said being 100kg and running lighter chains certainly wouldn't help. Most chain breakages are cause by some other factor that can increase the stress on the chain. Shifting under load increased stress, combine that with your weight and uber power then you might be able to break a chain even on a properly configure bike. In which case get a stronger chain! (Or weaker muscles!)
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Re: Broken Chain
Postby Duck! » Wed Nov 06, 2013 7:16 pm
That dodgy batch of chains has been out of circulation for at least three years, so we can probably discount that. Moreso given that the OP points out he's also breaking other chains.biker jk wrote:Duck is correct in that the chain was fitted wrong way around but I doubt that caused the breakage. Is it a 6700 or 6701 model chain? The first batch (6700) had quite a lot of breakages like yours so Shimano fixed the problem and released the 6701 model. If it's a 6701 chain and you're breaking them then jacks1071 is likely correct regarding changing gears under load.
I think, as H909 & jacks1071 suggest, it's a combination of setup and technique.
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Re: Broken Chain
Postby r11ss » Thu Nov 07, 2013 6:29 am
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Re: Broken Chain
Postby winstonw » Thu Nov 07, 2013 7:18 am
- what exact gear are you in when the chain breaks? i.e. 34:21 ?
- was your last change of the front or rear der, and did it occur quickly and cleanly?
- roughly how low a cadence are you getting down to on that pinch, and speed?
- get a good mechanic to check your chainrings. in the photo it looks like there's some teeth worn much more than others.
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Re: Broken Chain
Postby greyhoundtom » Thu Nov 07, 2013 9:48 am
+1winstonw wrote: - get a good mechanic to check your chainrings. in the photo it looks like there's some teeth worn much more than others.
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Re: Broken Chain
Postby Duck! » Thu Nov 07, 2013 1:58 pm
Why? It has nothing to do with the link breakage the OP is experiencing.Nate wrote:Use quick links when joining too
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Re: Broken Chain
Postby r11ss » Thu Nov 07, 2013 3:31 pm
Sent from my HTC Sensation Z710a using Tapatalk
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Re: Broken Chain
Postby r11ss » Thu Nov 07, 2013 3:35 pm
Sent from my HTC Sensation Z710a using Tapatalk
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Re: Broken Chain
Postby singlespeedscott » Thu Nov 07, 2013 4:15 pm
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Re: Broken Chain
Postby winstonw » Thu Nov 07, 2013 9:47 pm
if the chain break is not occurring straight after a gear change, then it seems more likely your gear selection is too high (though your cadence doesn't indicate that), or frame flex or chainring anomalies (uneven teeth or lateral flex) might be an issue.
let us know what it ends up being....it's an interesting case.
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Re: Broken Chain
Postby eeksll » Fri Nov 08, 2013 12:39 am
Heard a crack, the FD had pivoted on the braze on bolt. Can't see any cracks in the carbon so assume the crack was from the bolt letting go/slipping.
2013 campag athena.
hmmm I might go check my chain now too ... ekkk
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Re: Broken Chain
Postby r11ss » Fri Nov 08, 2013 7:46 am
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Re: Broken Chain
Postby Nate » Fri Nov 08, 2013 10:13 am
If he carried a few spare quick links he'd be up & running on the road for oneDuck! wrote:Why? It has nothing to do with the link breakage the OP is experiencing.Nate wrote:Use quick links when joining too
Just removing any possibilities - not just for the OP but for others too.
"correct use" of the tools & joining pins should yield no issues - but for a few $, a re-usable quick link makes life SO much easier - especially come maintenance time.
Others may also accidentally put a bit too much stress in the wrong place when using the tools & have the same issue.
If there's better & simpler ways of doing things & removing the possibility of damage/failure - i will suggest them!
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