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Cable Housing Liner Quandary

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Cable Housing Liner Quandary

Old 05-01-19, 03:13 PM
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bicycale
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Cable Housing Liner Quandary

Hi all.

I have a few 90's era bikes I'm reconditioning and most of them have some kind of tubing that seems to be cable housing liner as best as I can tell.

The different bikes use them for different things, none of which is lining cable housing.

Mostly they are just there as cable protectors between guides but the Kona Hahannah uses it to route the rear brake cable through a small hole in the seatpost clamp (this is how it came brand new).

Some of these liners are black and some are translucent/whitish but they all seem to be identical in outside diameter which I assumed was 3 mm since that's all I'm able to find.

Anyway, I recently purchased the black Jagwire 3mm housing liner and also some translucent 3 mm stuff on amazon branded Yuauy.

They are both very nice products and seem to also be identical to each other in terms of OD, ID, and wall thickness.

The problem is, the old stuff that was put on these bikes new is a bit different and in small but significant ways from the new.

They seem to be ever so slightly larger in OD (like maybe 3.2 mm) and they seem stiffer so I assume unless its just age that the walls are thicker too but it's the OD part thats bothersome.

That fraction of mm really makes a difference in fit. The new stuff is just a touch sloppy in the guides. My guides are double ended. One side takes standard 5mm endcaps and the other side is percfectly sized for these liner tubes to fit in like gloves-very sweet.

Old ones fit perfect, new ones are just a bit sloppy.

Ultimately I think what I bought will work but the OCD in me is really irritated by this.

Has anyone else noticed this over the years?

And are there any other housing liner products out there that people like?

I've searched and searched and found very little apart from the 2 I already bought and don't love.

Any help is greatly appreciated.

Thanks all.

Last edited by bicycale; 05-01-19 at 03:16 PM.
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Old 05-01-19, 09:33 PM
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The last time I bought housing it had the liner in it.
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Old 05-02-19, 10:25 AM
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Old 05-02-19, 10:30 AM
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so the pic shows from left to right:

4mm XLC shift cable
old liner/protection tube
old liner/protection tube
Jawwire 3mm housing liner

As the pic shows, the two old liners in the middle are the same dimensionally, and are definitely larger than the 3mm jagwire. In fact, the jagwire will fit inside both the old liners.

It's that older liner that I'm looking for.

Maybe that helps?
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Old 05-02-19, 11:20 AM
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A lined brake cable would be bigger inside, to fit brake cables which are bigger, themselves ..


20+ years ago I used loose liner so cable bare slipped easily inside the sleeve

Around which I had wound the wiring running to my tail light around ..

Just want plastic tubing ?, electrical heat shrink tubing can be bought in 4' lengths...

I went physically inside a B&M specialty store ..






....
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Old 05-02-19, 11:21 AM
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Amazon has PTFE tubing in several diameters.

https://www.amazon.com/Teflon-tubing.../dp/B07CXQKMVD
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Old 05-02-19, 01:04 PM
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I don't know when they changed, but shifter cables are narrower today than they were on my 1970's - 1990's bikes when they were the same or about the same size as brake cables.

As well, I'm a little unsure what it is you are wanting to line. I've known about cable sheaths being used for liners on some bikes. Particularly carbon bikes with internal cables. Very probably back in those days I was too cheap to buy any better quality product that might have involved liners for the cable.

So if you'd enlighten me a little on how they are used, I can add that knowledge to something that might come in handy one day.
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Old 05-02-19, 01:37 PM
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Originally Posted by fietsbob View Post
A lined brake cable would be bigger inside, to fit brake cables which are bigger, themselves ..


20+ years ago I used loose liner so cable bare slipped easily inside the sleeve

Around which I had wound the wiring running to my tail light around ..

Just want plastic tubing ?, electrical heat shrink tubing can be bought in 4' lengths...

I went physically inside a B&M specialty store ..






....
I dont just want tubing

I want the exact same tubing as either of the two middle examples in the pic

Heat shrink is very soft and wont work

I need this to be flexible but somewhat stiff.

I need it for several applications.

Pics and links to follow...
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Old 05-02-19, 01:40 PM
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Old 05-02-19, 01:47 PM
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The material in the first pic is the new yuauy stuff and it is sloppy fitting in the seatpost-clamp hole. The original stuff fit snug and stayed put in the hole the newer stuff holds on to the cable causing the tubing to move back and forth through the hole. I liked it better with the old stuff.

the material in the last 2 pics is the old, slightly larger OD stuff that's just a wee bit bigger than the 3mm jagwire and yuauy stuff.

again the original material fits all those guides and holes snugger and it's considerable thicker walled and tougher.

It feel much stouter in the hand than thr new stuff.

And I can't find any...
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Old 05-02-19, 01:56 PM
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Itís a way of protecting the cable or frame paint from vibration. Itís completely unnecessary. Rubber donuts do the same thing and do it better.

This isnít a crucial piece.
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Old 05-02-19, 02:03 PM
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Originally Posted by rosefarts View Post
Itís a way of protecting the cable or frame paint from vibration. Itís completely unnecessary. Rubber donuts do the same thing and do it better.

This isnít a crucial piece.
I think it's important in the first pic as it's an integral part of the original rear brake-routing design.

And I know the donuts but thanks for the suggestion.
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Old 05-02-19, 02:04 PM
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Need a cable solution for a 95 GT Arette. Any ideas?

This link will show another project that I really want it for as well
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Old 05-02-19, 02:27 PM
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really just need it where it passes thru that guide, & you can get that out of a V brake noodle

I built a touring frame use a few inches of auto hydraulic tubing stainless pretty soft , no liner needed


you want PTFE, but don't really need it ..

You could hire a seat post clamp made with a roller guide and not need any tubing..

its a separate band I see.
Tom Richey only used a couple inches..
https://www.velonews.com/2011/09/cyc...preview_191917


My AlAn Cross ran the cable through the seatpost.. over a roller bead inside..






....

Last edited by fietsbob; 05-02-19 at 03:14 PM.
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Old 05-02-19, 02:33 PM
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I used a short piece of copper tubing in a similar spot to your first picture. It was a superior solution.

If youíre going to work on old bikes, you need to figure out how to problem solve and substitute parts. Itís part of the skill set.
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Old 05-02-19, 06:44 PM
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Originally Posted by rosefarts View Post
I used a short piece of copper tubing in a similar spot to your first picture. It was a superior solution.

If youíre going to work on old bikes, you need to figure out how to problem solve and substitute parts. Itís part of the skill set.
No I just need to sucker rude arrogant dupes like you into telling me how to do it
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Old 05-02-19, 08:53 PM
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https://www.polyconn.com/polyethylene-tubing-18-od#1

What size is it in decimal inches. Don't assume it's metric
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Old 05-04-19, 02:24 PM
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Yup, my early '90s Univega Via Carisma has a similar setup for routing the rear brake cable. It's a bit of a kludge engineering. Sure, the brazed on lugs that guide the brake cable around the frame are pretty. But the design requires liner tubes to protect the frame and cable from abrading.

The original liner disintegrated and I couldn't find an OEM type replacement that fit the brazed on guides properly. I just snagged a foot or so of generic liner from the LBS and use it. Occasionally I need to tug the liner back into place, after repeated braking causes it to creep backward.

I suppose the idea was to eliminate the need for full length brake cable housings, which my other three bikes all have. But it doesn't save any appreciable weight on a bike that already weighs 30 lbs (and even my featherweight early '90s Trek 5900 uses full length brake cable housings, which must add another ounce or so of weight).

The problem is the bare rear brake cable runs along the top of the top tube. So if I slide off the saddle to lean against the top tube while stopped, I'm grinding the bare cable into the frame. So I really need a longer liner to run the 2' or so along the top tube. Would have been easier to use standard brake cable housing and reconfigure the cable stops as needed to accommodate the cantilever brakes.

Anyway, my sympathies. Best wishes finding the type of liner/housing originally intended for that setup.
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