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 Post subject: Cable rattle...
PostPosted: Fri Dec 11, 2015 12:52 pm 
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Joined: Fri Apr 12, 2013 1:19 pm
Posts: 739
Location: South West England
I'm having issues with my gear cables rattling against the downtube. They've always done it to some extent on my bikes, however now I ride aluminium, it is much more apparent. I had the same issue with my rear brake, but donuts helped.

Is this down to incorrect cable tension, and fixable with a service? The bike shifts flawlessly so I'm thinking no...

I'd rather not use donuts if I can avoid it as they tend to slip on gear cables (the diameter is too small). I run my routing criss-crossed and am not sure straight routing would work with my frame (it's ugly, basically).

Any suggestions?

_________________
Scott CR1 - 7.1kg - dead
BMC SLR02 - 7.6kg - dead

Kinesis Aithein - ~8kg


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 Post subject: Re: Cable rattle...
PostPosted: Fri Dec 11, 2015 3:35 pm 
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Joined: Fri May 25, 2007 6:43 pm
Posts: 2628
Crossed routing moves the cable closer to the frame (Given fairly "standard" cable routing)


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 Post subject: Re: Cable rattle...
PostPosted: Fri Dec 11, 2015 3:42 pm 
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Joined: Sat Mar 19, 2011 10:50 pm
Posts: 659
Run some Nokon cable liner down the entire exposed cable. This will stop the rattle.


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 Post subject: Re: Cable rattle...
PostPosted: Fri Dec 11, 2015 4:32 pm 
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Joined: Thu Mar 17, 2011 7:29 pm
Posts: 49
Do the cables rattle regardless of gear selection? If no, could be a tension issue. As a last resort, you could apply "helicopter" tape to the problem area to reduce/eliminate the noise. 3M makes this material to protect the front end of vehicles from road debris damage.


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 Post subject: Re: Cable rattle...
PostPosted: Fri Dec 11, 2015 4:58 pm 
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Joined: Fri Apr 12, 2013 1:19 pm
Posts: 739
Location: South West England
It seems to do it at random. It can be quiet all ride and then suddenly start, and I've noticed no difference in different gears thus far. It has been getting steadily worse as I've ridden the bike over the past 3 months, so I'll give it a service regardless and see if it improves.

Heli tape would definitely be a last resort - I'm hoping to solve it mechanically if possible.

_________________
Scott CR1 - 7.1kg - dead
BMC SLR02 - 7.6kg - dead

Kinesis Aithein - ~8kg


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 Post subject: Re: Cable rattle...
PostPosted: Fri Dec 11, 2015 5:27 pm 
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Joined: Tue Apr 15, 2014 9:49 pm
Posts: 573
There must be a gap/space somewhere along route where the cable is moving/touching /rattles.
You could try just wrapping a bit of tape at certain points and see if the rattle stops. Then you will know where the issue is.
Have you wiggled the cable while stationary. It should rattle and you could trace the noise.
You should try this in your slackest gear.

You could also if possible shorten your outer housing. This may help. I see far to many bikes with excessive outer housing. Keep it to a minimum.


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 Post subject: Re: Cable rattle...
PostPosted: Fri Dec 11, 2015 6:25 pm 
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Joined: Sun Jul 29, 2012 12:49 am
Posts: 434
Agree with the liner recommendation to avoid metal to metal contact.


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 Post subject: Re: Cable rattle...
PostPosted: Sat Dec 12, 2015 8:01 am 
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Joined: Wed Oct 06, 2004 6:55 pm
Posts: 2278
Location: Vienna, AUT
Some of the above and perhaps a downtube protector. BBB makes one that is clear with a nice rubbery feel. You can cut it to size as needed and it certainly damps noise from stones while protecting too, so it would probably work with the cable situation.


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 Post subject: Re: Cable rattle...
PostPosted: Sun Dec 13, 2015 12:07 am 
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Joined: Sat Nov 10, 2007 9:51 pm
Posts: 416
Another option is clear heat shrink tubing, just buy 1mm larger than cable diameter beign used

http://www.ebay.com.au/itm/5pcs-1M-3Fee ... SwyQtVp2yb


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 Post subject: Re: Cable rattle...
PostPosted: Mon Dec 14, 2015 8:53 am 
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Joined: Fri Apr 12, 2013 1:19 pm
Posts: 739
Location: South West England
xena wrote:
You could also if possible shorten your outer housing. This may help. I see far to many bikes with excessive outer housing. Keep it to a minimum.


I was interested in this point so examined the bike this morning. Both gear outers are slightly too long - I then realised I cut the cables with a longer stem on the bike, before I dialled in my fit. This probably has something to do with it! :thumbup:

I'll give it a full service this week and adjust the outers and see how it is then, and maybe try one of the other solutions if the issue persists.

Thanks for the advice.

_________________
Scott CR1 - 7.1kg - dead
BMC SLR02 - 7.6kg - dead

Kinesis Aithein - ~8kg


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 Post subject: Re: Cable rattle...
PostPosted: Mon Dec 14, 2015 11:22 am 
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Joined: Tue Apr 15, 2014 9:49 pm
Posts: 573
Brilliant ,I'm sure that will sort it :thumbup:


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 Post subject: Re: Cable rattle...
PostPosted: Mon Dec 14, 2015 8:48 pm 
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Joined: Tue May 28, 2013 10:50 pm
Posts: 119
They make donuts that don't slip on shifter cable. Cable liners can slightly ping on shifter cables. Crossing cables helps a whole lot, with teflon tubing where they cross.


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 Post subject: Re: Cable rattle...
PostPosted: Tue Dec 15, 2015 9:20 am 
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Joined: Fri Apr 12, 2013 1:19 pm
Posts: 739
Location: South West England
I think if anything the crossing may have made it worse, as they are closer to the downtube. That said, the routing is much better so I wouldn't run them parallel. Donuts are pretty ugly so I'll use them as a last resort.

_________________
Scott CR1 - 7.1kg - dead
BMC SLR02 - 7.6kg - dead

Kinesis Aithein - ~8kg


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