Threading brake cable in top tube ?

[robin]

I am going to replace my rear brake cable as the sheathing is cracked in a couple of places.

The sheaving enters the top frame tube on front left hand side and exits at rear at the top.

Any tips for replacing sheaving as I can see if I pull it out of frame it may take forever to get it to feed correctly again.


thanks

 

[Zoiders]

Pull the outer off but leave the old cable in place.

Thread the new outer over the old cable, then replace the old cable.

 

[biggs682]

just run outer cable in one end first and then with a small thin pr of tweezers or long nosed pliers , i have always managed to grab the other end at other hole then feed inner cable through piece of pizz

 

[robin]

thanks

waiting on arrival of new cable and sheath.

look forward to fitting in next few days post permitting.

cheers

 

[raindog]

My Italian steel has this system and there must be some sort of guide inside the tube, because when I rebuilt the bike I simply poked the outer cable in the entrance and it came smoothly straight out of the exit hole. Be interested to know whether yours is the same - give it a go like that first maybe?

 

[02GF74]

As ^^^^ said, there maybe a guide i.e. a tube inside the frame.

If not then you can try using tape to attach the new cable outer and pull it through - chances are it will be too thick to go through.

So pull the outer out but leaving the inner in and attach the new outer to the old inner or thread the new outer over the old inner and somehow splay the inner so that can be used to pull the cable through.

If that fails, using a piece of wire e.g. MIG steel welding wire to poke through and hopefully catch the end with narrow pliers or put a small hook on the end and use another wire with hook to attemp to catch the hook.

If that fails, a small nut on a piece of string and use gravity to findthe exit hole, then attach wire to string then attach the cable to the wire.

In order I hjave listed them, each method takes longer than the previous.

 

[andrew_s]

Pull the outer off but leave the old cable in place.

Thread the new outer over the old cable, then replace the old cable.

I'd recommend doing it the other way round.
Put a new inner in, then pull the old outer off and replace with a new one.
Used inners often have chewed up ends that won't thread back in easily

 

[robin]

still waiting for sheath and cable to arrive (today ?)

 

[raindog]

Don't think I can stand the suspense much longer robin.
Can't you just slide a length of any old bit of cable in as I suggested, and see what happens?

 

[robin]

Still waiting for the sheath to arrive, cables came today.

Keep holding your breath raindog

 

[mickle]

For set-ups without internal guides there is only one solution;

Remove old cable from outer casing
Insert new cable into outer casing
Remove old outer casing (leaving new cable in place)
Insert new outer casing over cable, using new cable as guide

Simples.

 

[robin]

My Italian steel has this system and there must be some sort of guide inside the tube, because when I rebuilt the bike I simply poked the outer cable in the entrance and it came smoothly straight out of the exit hole. Be interested to know whether yours is the same - give it a go like that first maybe?

No, No internal guide when I looked today.

I did the method suggested this morning of using the existing cable as guide and rethreading etc.

That was easy.

thanks

 

[Zoiders]

I'd recommend doing it the other way round.
Put a new inner in, then pull the old outer off and replace with a new one.
Used inners often have chewed up ends that won't thread back in easily

You nip the end off the old one.

 

[robin]

I put new cables in as well as the old ones were a bit mucky and more importantly too short to snip and use again.