Replacing internally-routed rear brake cables

For discussions about bikes and equipment.
campag34a
Posts: 19
Joined: 8 Aug 2012, 2:28pm

Replacing internally-routed rear brake cables

Postby campag34a » 19 Jul 2014, 9:16am

For those occasions when someone has removed the old cable without first using it to "fish" through the new one, and you are left facing two holes in the frame. You will need: your new brake cable, a cable-tie... er, that's it. With the bike upside-down, bend the cable-tie double and push it into the hole in the frame nearest the brake mechanism. The cable-tie will form a loop inside the frame.

Now push your new brake cable in from the other hole in the frame, having put a cable-end cap on it first to prevent fraying, until it goes through the loop formed by your cable tie. Join the ends of the tie together and pull sharply upwards -- with any luck, your cable should emerge cleanly from the hole. Saves much time messing about with metal coat hangers, a nut on a string, or even cotton thread and a vacuum cleaner...

User avatar
Mick F
Spambuster
Posts: 47831
Joined: 7 Jan 2007, 11:24am
Location: Tamar Valley, Cornwall

Re: Replacing internally-routed rear brake cables

Postby Mick F » 19 Jul 2014, 9:26am

The only time I've replace the rear cable on a bike with it internally routed, the route was in a narrow tube, so I just threaded it through.
Mick F. Cornwall

Brucey
Posts: 36822
Joined: 4 Jan 2012, 6:25pm

Re: Replacing internally-routed rear brake cables

Postby Brucey » 19 Jul 2014, 9:34am

needless to say there are several different arrangements in use, and you only find out if there is no internal liner after you have pulled the old cable out; d'oh!

If the holes are small, or there is a brazed-on fitting, you can't always use the zip tie trick. In such cases I quite like using 4mm dia nylon pneumatic hose; you can thread a wire down the middle of it to stiffen it and feed it, or alternatively you can shine a light down the centre of the tube so that you can see the end of the hose when you are aiming for the exit hole.

Lots of different ways of skinning this particular cat!

cheers
-------------------------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

Valbrona
Posts: 2262
Joined: 7 Feb 2011, 4:49pm

Re: Replacing internally-routed rear brake cables

Postby Valbrona » 19 Jul 2014, 8:57pm

campag34a wrote:Saves much time messing about with metal coat hangers, a nut on a string, or even cotton thread and a vacuum cleaner...


I only need a couple of divining rods and the power of my mind.
I should coco.

22camels
Posts: 302
Joined: 21 Sep 2013, 8:15pm

Re: Replacing internally-routed rear brake cables

Postby 22camels » 24 Jul 2014, 1:30am

A magnet worked for me the other day :).

User avatar
Redvee
Posts: 2190
Joined: 8 Mar 2010, 8:58pm

Re: Replacing internally-routed rear brake cables

Postby Redvee » 25 Jul 2014, 2:30am

The only bike I've had with internal brake cables was an old Shogun frame. The cable was fully enclosed in outer from lever to calliper and had plastic 'cups' that slotted in the frame for the cable out to emerge from. From memory I threaded a cable through the top tube and hooked it out with a bent spoke then threaded the outer onto the inner cable and pulled the inner out then cut the outer to approximate length and then passed the correct inner cable through.

brynpoeth
Posts: 12018
Joined: 30 Nov 2013, 11:26am

Re: Replacing internally-routed rear brake cables

Postby brynpoeth » 23 Jan 2020, 12:50pm

Thread resurrection alert

Are concealed cables good or bad? I think brazed-on cable guides outwith the frame are better
Holes might let water in or make the frame weaker
Last edited by brynpoeth on 28 Jan 2020, 7:28am, edited 1 time in total.
Entertainer, kidult, curmudgeon
Cycling-of course, but it is far better on a Gillott
We love safety cameras, we love life "597"

fredwinter
Posts: 13
Joined: 9 Nov 2019, 8:54pm

Re: Replacing internally-routed rear brake cables

Postby fredwinter » 23 Jan 2020, 7:01pm

gave up on my Canondale himod and ran the rear brake cable exterior. Life is too short. :D

Mike Sales
Posts: 4202
Joined: 7 Mar 2009, 3:31pm

Re: Replacing internally-routed rear brake cables

Postby Mike Sales » 23 Jan 2020, 7:06pm

Redvee wrote: then threaded the outer onto the inner cable and pulled the inner out then cut the outer to approximate length and then passed the correct inner cable through.


Mr. Habib used a similar technique when reaming out my urethra.
First a camera on a wire to find the way, and then used it to guide the catheter.

saudidave
Posts: 352
Joined: 16 Jan 2009, 12:22am

Re: Replacing internally-routed rear brake cables

Postby saudidave » 23 Jan 2020, 7:17pm

Was he taking the p***?

peetee
Posts: 1677
Joined: 4 May 2010, 10:20pm
Location: Cornwall

Re: Replacing internally-routed rear brake cables

Postby peetee » 24 Jan 2020, 8:37pm

Those methods are great tips to know but sometimes it’s nice to struggle for a few hours, let off a bit of steam, get hot under the collar, shout profanities, grind your teeth, scream, bend a few cables, shout at inanimate objects, go for a walk round the workshop, try again, repeat all the above, go for a walk round the garden, repeat all the above, go for a walk round the neighbourhood, kick a few lamp posts, get quizzed where you have been, get grilled about why, have your other half laugh at your “childishness”, have a sulk, do something in the house “For a change!”, get issued your ‘shed pass’, try again and get the cables through in two seconds flat. It’s a sort of right of passage and justification for being out there for hours.......
Or have I just been out there too long?
Current status report:
Back on two wheels in deepest Pastyland and loving every minute. Mission: to enjoy big, bad hills again.

cyclop
Posts: 306
Joined: 3 Oct 2013, 7:49am

Re: Replacing internally-routed rear brake cables

Postby cyclop » 27 Jan 2020, 12:16pm

Same old "form before function",clean looks,zero advantage.

Marcus Aurelius
Posts: 794
Joined: 1 Feb 2018, 10:20am

Re: Replacing internally-routed rear brake cables

Postby Marcus Aurelius » 27 Jan 2020, 1:22pm

Remove the cable guide under the frame at the BB, and then put a long length of cable outer into the frame through the holes, with a bit protruding from each end. Push the new brake inner cable through the outer, then when it’s through the frame, withdraw the outer from the frame. Easy peasy, that’s the way I usually do it. Just make sure you thread any grommets onto the inner cable you’re using before you thread it through the section of outer, in the frame. I use the same trick for internally routed gear cables.

mattheus
Posts: 1453
Joined: 29 Dec 2008, 12:57pm

Re: Replacing internally-routed rear brake cables

Postby mattheus » 27 Jan 2020, 5:35pm

Why has this 6-year-old topic been revived? Surely bikes aren't still being made with these daft things?!?

nigelnightmare
Posts: 625
Joined: 19 Sep 2016, 10:33pm

Re: Replacing internally-routed rear brake cables

Postby nigelnightmare » 1 Feb 2020, 12:04am

I believe they are. :roll: