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AASQ #16: When should I replace my cables and housing?

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If your bike has a derailleur (or mechanical brakes), then you probably have a bike that is equipped with the standard cable and housing. I say probably, because electronic and hydraulic systems have replaced the simple steel inner cable in many cases, but are still the exception rather than the rule. Because the cable and housing system is so ubiquitous, it’s also a common source of questions. An often overlooked wear item on many bikes, the diminutive cable and housing can have a big impact on shifting or braking performance.

That’s why our AASQ series this week focuses on all things cable and housing. Starting with a simple question about whether you should replace the system as a whole or if you can replace one of the components at a time, we reached out to Jagwire for some input. Why Jagwire? As long as I can remember, they’ve been a fixture in every shop I’ve worked in for the cable and housing department. Chances are pretty high that if you go into a bike shop to have bulk housing installed, it will probably come from a Jagwire box (or sometimes it’s Jagwire housing in another brand’s box). And while they’ve become the go-to source for many shops for their affordable replacement parts, they also have an entire line of high end cable and housing which seemed to make them a great source for additional insight.

AASQ #16: When should I replace my cables and housing?

When it comes to replacing cable and housing – Which is more important to replace, the cable or the housing? Or should they always be replaced together? 

Jagwire: We always recommend replacing them together, as this is the only way to ensure your brake and shifting systems can work at their best.  Inner cables and housing wear in different ways, and depending on which type of each you have, along with the associated small parts being used, either one could wear down first.

Inner cables are typically either stainless or galvanized steel (with a zinc coating applied) to reduce corrosion.  With galvanized cables, corrosion will occur once the coating deteriorates, leading to higher friction or even complete failure under load, in severe cases.  Stainless steel cables are much more durable, but even they aren’t completely corrosion resistant.  In extreme conditions, even stainless cables can oxidize and suffer reduced performance.

Some high-performance cables use a PTFE or other polymer coating to fill in imperfections and reduce surface friction. While these coatings can improve initial performance, they lose effectiveness when the coating wears or flakes off. In the worst cases, the flaked-off coating can actually clog the housing liner and add significant friction to the system. While uncoated stainless steel cables are typically the most durable option, even they will see reduced performance when dust, dirt, and other particles find their way into the grooves between the individual wire strands.

Housing most commonly needs replacement when the lubrication in the liner has washed or otherwise worn away, or if contaminants have worked their way inside. Either of these is difficult to see, but will affect the movement of the cable within the housing. On a bike with tight housing bends, it’s also possible that the cable may wear through the liner entirely end up rubbing against the steel housing structure.

Since there are multiple ways the cable and housing system can wear down, with many of them difficult or impossible to see, we recommend replacing the set so you know your bike will be working as well as possible. Of course, if you ever see visible damage – such as a cable fraying or unwinding, a kink or cut in the housing, or strands pulling through the end of a shift or compressionless brake housing – we recommend replacing it immediately.

What’s the best way to prolong the life of your cable and housing if you can’t replace it? Basically, are there any tricks to keep it running smoothly, longer? (regreasing cables, cutting off compressed ends of housing, etc?)

Jagwire: To get the most life out of the system, the best thing you can do is take special care in the setup when you install it. Using stainless steel cables and pre-lubricated housing is a good start. Then, using sealed ferrules to keep contaminants out and lubricant in, can help tremendously, especially if you’re ever riding in wet or dusty conditions. Alternatively, using lined ferrules is a good way to protect a coated cable, by preventing the coating from wearing off as it passes through the exit.

Bikerumor: We get why Jagwire wouldn’t endorse methods of extending the life of your current cables and housings, but there are things to consider. While replacing the whole system will almost always result in the best performance, there have been many times where I personally have needed to improve the shifting on a bike without being able to replace the whole system. From working pro bono on a customer’s bike who couldn’t afford afford the labor charge, let alone replacement parts, to simply not having a long enough section of housing for a frame that runs a full length in one of those situations where you’re working on the bike at midnight the night before you leave on a big trip, sometimes you find yourself in a pinch where things have to be done.

One of the biggest tips I have is that with linear housing, after a while the metal strands start to poke out the end of the housing under the ferrule. Removing the cable and ferrule and cutting the end of the housing off to remove this section will have a huge impact on shifting performance once you install new ferrules in the process. While you’re at it, if you can swing it, I lube up the cable with Shimano SP41 grease (after cleaning the cable with a rag) before reinserting it into the housing. Just a dab on your fingertips and then run the entire length of the cable that’s under housing. SP41 is kind of expensive, but it’s absolutely worth it and the only additional lubricant I will use with cables and housings since it doesn’t gum up or attract much dirt and grime in the long run.

How much of an effect does ferrule choice have on housing/cable performance?

Jagwire: Quite a bit! While a basic brass brake housing ferrule or nylon shift housing ferrule will do the job, it’s worth paying a little extra attention to the details.

When it comes to the material used, we recommend using aluminum end caps whenever possible. These are CNC’d to precise tolerances, ensuring a good fit both on the housing as well as in the housing stop. Even more importantly, the aluminum will not compress under load like plastic ones can – especially considering the precise cable movement needed by 11- and 12-speed derailleurs. They’re also more durable, and better at keeping the housing strands in place on shift and compressionless brake housings.

Beyond the material used, ferrules can have other features to make sure your cable and housing work their best. Sealed ferrules typically have a rubber o-ring placed inside to help keep water and other contaminants out, while keeping the lubricant in the housing. Jagwire also offers “hooded” ferrules, which use a double-lip seal for use in particularly nasty environments.

Lined ferrules have a short liner extending from the base of the end cap. These provide a low-friction solution, as they prevent the inner cable from rubbing against the metal edge of the exit hole. They’re necessary if you want to get the maximum life out of a coated cable, but also reduce friction with a plain, uncoated cable. They can also be used in conjunction with a seal for added protection.

There are even specialty ferrules for more unique situations. “Anti-kink” ferrules are available for folding bikes, externally-routed dropper posts, or other setups where the housing might be forced into a tight bend. There are also many different reducer ferrules made to match modern housing with the wide array of housing stops found on frames, derailleurs, and brake calipers.

What is the best lube/grease to use on cables?

Jagwire: The best lubricant is the one found inside your new, pre-lubricated housing, which is formulated to balance low friction with water-resistance and durability. The biggest difference, however, between original lubricant and anything you add later is in the application itself.

All of Jagwire’s pre-lubricated housing has the lubricant added as the housing’s inner liner is initially extruded. This ensures that there is an even distribution throughout the entire length of housing. While you can get cable-specific grease separately, your only options are to either inject it into cut ends of housing or rub it on the inner cable before inserting it. In either case, you won’t have consistent lubrication throughout.

It’s also possible to add a liquid lubricant to the housing. While this might feel great initially, as it will work its way further into the housing than a grease would, it won’t have the long-term water resistance or overall durability. Many liquid lubricants will also attract dirt, which accelerates the wear even more.

AASQ #16: When should I replace my cables and housing?

What are best practices to cutting new housing, installing ferrules, and installing and cutting/crimping cables?

Jagwire: I don’t think this is going to be a revelation to anyone, but the key to getting a good, clean, square cut is to use a housing cutter with hard, sharp blades.   Beyond that, though, there are a few other details to consider. If you’re cutting traditional coiled-steel brake housing, it’s a good idea to file the end to make sure it’s smooth and squared-off. And regardless of the housing type, you’ll want to open the cut end with an awl to make sure the inner cable isn’t getting pinched. Likewise, making sure the outside is round will ensure the ferrule goes on well.

Once you’ve prepped your housing, make sure the ferrule is firmly pressed onto the end. This is an important step – most of the time when folks “stretch” cables, they’re really just setting the ferrules properly. Most high-quality inner cables are pre-stretched during the manufacturing process, and any sort of break-in of a cable/housing system is actually just the ferrules working their way onto the housing ends. One benefit of using high-quality aluminum ferrules is that they’re better at getting set and keeping everything in place once there.

For inner cables, a sharp, hard cutter is again the key. For anyone cutting a lot of cables and housing, we recommend using a separate cutter for inner cables than for housing. While a traditional housing cutter is certainly capable of cutting an inner cable cleanly, the larger jaw means that cables are always cut in the same spot, dulling the blades at that point. By using a dedicated cable cutter like the Jagwire Pro Cable Crimper and Cutter with a smaller cutting blade will help prolong the life of both tools.

Crimping the cable ends – straight across or an ‘X’ pattern?

Jagwire: Really, all a cable tip needs to do is keep the cable from unwinding, so as long as it stays in place you’re good to go. A single line? Sure. An “X”? Even better! A “Z” for “Zach”? Why not? To the folks that break out the soldering iron to give it a clean finish, I salute you! But I’d be remiss if I didn’t take the opportunity to (again) plug the Jagwire Pro Cable Crimper and Cutter. It’s got an integrated 3-sided crimper that takes any guesswork out of the process and gives a factory-style crimp without going all the way through to the cable – very pro.

How long can you expect to get out of a set of cables and housings? Or when should you replace them?

Jagwire: This is the question we get more than any other, and unfortunately there’s not a definitive answer. Conditions play a big role, with riders in dusty or wet (particularly when salty) places needing to replace more frequently. The system also comes into play – your new Eagle kit requires a lot more precision than the friction shifters on your bar bike, and so will require extra attention. And as alluded to earlier, the cable and housing installation is really important. Pre-lubricated housing, slick stainless steel cables, and appropriate high-quality ferrules go a long way in extending the life of the system.

Since there are so many different ways that cables and housing can wear, and with many of them being difficult or impossible to inspect, there isn’t an easy way to measure wear like with brake pads or chains. If it gets far enough, you’ll feel it with grittiness in the brake lever feel or with shifting that just won’t adjust properly, no matter how much you adjust the cable tension and limit screws. But ideally you’re practicing preventative maintenance with these – if you’re a typical enthusiast rider riding mostly in fair weather, new cables and housing every year with your annual tune-up is probably about right. If you’re riding tens of thousands of miles and replacing chains multiple times per year, you’ll probably need new cables and housing more frequently. If you’re in doubt, check with your favorite local mechanic to take a look and make the call.

Jagwire.com

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26 Comments
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boom
boom
6 years ago

Trying to revive your own personal clapped-out cable and housing is one thing, but I would caution against doing it for a customer if you work in a shop. I don’t allow my mechanics to do that any more. It often takes more time to breath temporary life into old cables than to replace with new, and they don’t want to charge for it. I don’t allow my mechanics to do work for free.

badbikemechanicx
badbikemechanicx
6 years ago
Reply to  boom

Agreed. I think younger mechanics have a tendency to do what they think is ez jobs for free. At least that was my thinking years ago. You need to remind them that they are providing a skill.

SB
SB
6 years ago
Reply to  boom

Agreed…I wondered about this too. Labour should ALWAYS exceed the cost of cheap cable bits. I trust any competent mechanic doesn’t come to Bike Rumor for advice – particularly management advice.

badbikemechanicx
badbikemechanicx
6 years ago
Reply to  SB

@SB Judging by the snark of most comments- I would assume bikerumor is full of competent mechanics and that’s exactly where you should take advice especially in the era of companies like…cough Canyon… threatening to destroy to destroy the bike shop model by selling direct. Bike shops are merely becoming bike maintenance and parts hanging depots.

FFM
FFM
6 years ago
Reply to  boom

On point. Housing is cheap, time is scarce, and no one wants to do a job twice. And don’t let anyone tell you housing isn’t cheap (except Campy or Jagwire’s elite link kits that can set you back almost $150 but are freaking sweet).
The article is spot on about getting SS cables too. PTFE can even clog on install if it’s tight internal routing (front brake on a Venge VIAS makes… seven 90 degree turns?) Always spring for aluminum ferrules and definitely compressionless brake housing for full length runs. Short on cash? A couple drops of Tri Flow will get you through to pay day but do it right and get the cable and housing done together.

badbikemechanicx
badbikemechanicx
6 years ago

This was not a stupid question. However- it is probably more than you ever wanted to know about cables. I think Jagwire is doing an awesome product. My trek alr was completely speccd with Jag. So impressed I am going to replace all my bike cables with them.

Flatbiller
Flatbiller
6 years ago

As implied, cables don’t stretch; housing (and/or ferrules) compress. Semantics? Maybe, but it helps to keep this in mind when diagnosing.

Dockboy
Dockboy
6 years ago

How do segmented housings change things? With a replaceable liner, do the outer bits wear out? Do they keep working longer?

Tim
Tim
6 years ago

I’ve been running Jagwire’s segmented housing on my road bike since March of last year. I’ve changed inner cables at the end of last season and just about a month ago when I upgraded shifters. I’ve done nothing with the outer housing or the liner. Shifting and braking is still flawless. I ride in all sorts of weather and have had no issues. My only (trivial) complaint is that sometimes the housings creak just a bit where they curve from the bars to the entry points in the frame. I can only hear it when walking the bike in a quiet environment, never on the road. I think I just need to disassemble it and clean the segments the next time I have the bike apart.

Rod Diaz
Rod Diaz
6 years ago
Reply to  Tim

@Tim – I have no experience with the Jagwire segmented housing but used Nokon a few seasons. Yes, it does creak. After cleaning the bike, I would normally run a lightly oiled rag over the housing and that would help. Even better were the polishing products (like Pedro’s Bike Lust or similar). They would solve the squeaking and make everything shiny.

shafty
shafty
6 years ago

Blah Blah *Insert plug for Jagwire product* it depends.

Beat_the_trail
Beat_the_trail
6 years ago
Reply to  shafty

Why do you read it if you think they’re hacks?

Sort of rude.

James Fryer
6 years ago

Some good tips on setting up new housing and cables, but the rest reads like an advertisement.

Cleaning cables and housing is easy:
1. Pop housing out of stops
2. Wipe down cable
3. Run housing back and forth on cable – this will drag the dirt out of the housing onto the cable
5. Lightly lube cable and run housing back and forth over cable again – this will drag more dirt out of the housing
6. Continue until clean and leave a light film of lube in the housing

I prefer wax based lubes for this like white lightning. Use what you like and what works best in your climate.

Using a bench grinder on the ends on new housing is a quick and effective way to clean them up and ensure they seat properly in the ferrule.

#yourbikehatesyou contributor
#yourbikehatesyou contributor
6 years ago
Reply to  James Fryer

this will not clean (as the heading implies) the housing entirely. it also wastes/mixes new lubricant with grime.

won’t work on frames with internally routed cables, frames with enclosed housing stops, bars with internally routed housing, or any beaded housing systems.

It takes less time to replace the cable and the housing.

James Fryer
6 years ago

Housing doesn’t need to be spotless to work great. Wastes lube? Seriously?

Obviously it won’t work with all the new silly ways of running cables, pointing that out is just pedantic.

Maybe I should have stipulated this is for the home mechanic, not a shop environment. In a home shop, this will be much faster and easier.

#yourbikehatesyou contributor
#yourbikehatesyou contributor
6 years ago
Reply to  James Fryer

but it does need the liner, to be in good condition. dragging dirt/grime out isn’t ever a good sign.

why not use a solvent to clean grime, from the inside of housing?

if shoulds and musts…i’m just picking up the slack.

it’s not going to be obvious to many home mechanics. that’s your intended audience, isn’t it?

at least it’s not as inefficient, as using pipe cleaners to scrub the housing liner.

SteveP
SteveP
6 years ago

I guess I’ve missed these CNCed ferrules . Where do they come from? Many brifters don’t even use ferrules at the shifter end, and while I remember Gore’s sealed cables, I guess I have missed anything current. Certainly not supplied as stick with even high end groupsets

lop
lop
6 years ago
Reply to  SteveP

Housing with CNC’ed ferrules was spec’ed on every 7900/6700/5700 bike from Shimano, but rarely ever installed. When these parts were used, shifting would often improve dramatically. As for where to get them – from any parts distributor. SRAM, Shimano, Jagwire and Promax all make commonly available metal ferrules, with some amount of machining.

Sean
Sean
6 years ago

If only someone made pre-lubed housing…

lop
lop
6 years ago
Reply to  Sean

(whispering) “….sp41….”

FFM
FFM
6 years ago
Reply to  Sean

Jokes or serious? Quote from the article you just commented on:
“All of Jagwire’s pre-lubricated housing has the lubricant added as the housing’s inner liner is initially extruded.”

Seraph
Seraph
6 years ago

Step 1: remove old cables
Step 2: replace cables with Jagwire Link kit
Step 3: profit

Antoine
Antoine
6 years ago

use ONLY SHIMANO cables and HOUSING, the best there is, ever monder why pro-teams don’t use JAGWIRE ? ….

sal
sal
6 years ago
Reply to  Antoine

… because they’re not paid to do so?

yer_boi
yer_boi
6 years ago
Reply to  Antoine

Agreed. Shimano’s cables are lighter, more durable, and the price is comparable. It’s one of those things where the value exceeds the price.

Tyler Benedict
Admin
6 years ago

All, just to clarify, we reached out to Jagwire because they’re one of the few remaining 3rd party housing and cable manufacturers. Yes Shimano is good stuff, too, but we reach out to them quite a bit on other inquiries, so we thought we’d spread the love around a bit and ask other brands for input. At the end of the day, can you fault a brand person for promoting their brand? Take away what you will and ignore the marketing if it helps. We definitely try to steer the conversation to provide useful information regardless of self promotion (shameless or otherwise), but we want to leave peoples’ replies intact when possible. Cheers, and thanks for reading.

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