Cable routing help

[sefton1275gt]

Or I could run the all around the right of the headtube

 

[clubby]

I’ve found that I needed some form of cable on either side of the head tube to balance out the tension on the steering. It may be small but definitely noticeable. Rear brake definitely in the left routing coming from the left of the head tube.
I wouldn’t worry about using a ferrule on the small connection of brake routing at the seat tube. There’s going to be no movement in the bosses and as long as the gear outer you are using doesn’t drag (brake cables are often thicker than gear cables) it will be fine.

For the gears I would try out the front mech on the outer right and rear in the middle. From the photos, it looks like it would give a less tight arc for the front outer coming across from the shifter.

Often with frames designed for the US style rear brake on the right, the routing will be a compromise.

 

[pedestrian]

On the Alta they used a piece of teflon cable liner inside the tube. Some more pictures: https://budgetbicyclectr.com/new-1995-mongoose-alta-mountain-bicycle.html

 

[bikeworkshop]

Could I not slide in some gear cable like the photo and thread the brake cable through that?

You can't use gear housing for braking- it's not designed to take compression, and will usually split open causing brake failure .

 

[sefton1275gt]

Thanks mate. Apart from the rear brake around the left of the headtube, that’s how I’ve set it up so far

 

[sefton1275gt]

On the Alta they used a piece of teflon cable liner inside the tube. Some more pictures: https://budgetbicyclectr.com/new-1995-mongoose-alta-mountain-bicycle.html

Cheers. I have a Saracen with this teflon tube inside the tube. Will see what I can fine on the interweb.

 

[sefton1275gt]

You can't use gear housing for braking- it's not designed to take compression, and will usually split open causing brake failure .

Would there be compression if there isn’t any ferrules fitted (it’s effectively a tube)

 

[bikeworkshop]

Would there be compression if there isn’t any ferrules fitted (it’s effectively a tube)

If it's running fixed ferrule to ferrule, then effectively it's a guide, rather than a Bowden Cable...

On the back section it might be ok, but from the lever to the top tube, the inner is more clearly attempting to pull itself into a straight line, causing levels of stress the outer isn't expecting.

The inner diameter ought to be different too.

 

[pedestrian]

 

[sefton1275gt]

Found some