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Cables for mechanical disc brakes?

Old 08-14-20, 07:43 AM
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Racing Dan
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Cables for mechanical disc brakes?

So I have TRP spyres and they've never been great. Low brake "power" and a somewhat mushy lever feel. I changed cables to compression less cables from Wiggle, the Life line brand. Now they are firmer, but there appear to be a lot of friction in the cables and thus a very firm lever squeeze is required to stop. I just about had it with these brakes.

Any recommendations. Im thinking other, better cables but what kind?
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Old 08-14-20, 07:48 AM
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Did you change the cables or just the housing?
I'd switch to Jagwire compressionless housing and new die drawn cables.
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Old 08-14-20, 07:52 AM
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I've seen a couple lately with the housings way too long, with an extra bend. I removed 6" off the front and 3" off the rear of one bike recently, for a great improvement.

Do the levers match the calipers (road for road, mtn for mtn)?
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Old 08-14-20, 07:56 AM
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Jagwires.

But I don't know that it is your cables. The whole point of compressionless cables is to get rid of the lever flex that comes from compressing the cable housings. Brakes should go from off to on with very little movement. Just like using stainless wrapped brake hoses on a car.

sounds to me like you need some better pads. I like kool stop pads with my spyres. Make sure your rotors are clean as well. Deglaze them with a sander using fine grit garnet sandpaper.
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Old 08-14-20, 08:00 AM
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Originally Posted by leob1 View Post
Did you change the cables or just the housing?
I'd switch to Jagwire compressionless housing and new die drawn cables.
Both. The inner is extra smooth, but none the less it appear to have a more friction than the old cable with coating.
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Old 08-14-20, 08:04 AM
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Originally Posted by andrewclaus View Post
I've seen a couple lately with the housings way too long, with an extra bend. I removed 6" off the front and 3" off the rear of one bike recently, for a great improvement.

Do the levers match the calipers (road for road, mtn for mtn)?
The cable is as short as can be. The length in the package was barely enough. The bike has Tiagra road brifters and post mount calipers. Im not aware TRP makes any distinction between road or mtb.
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Old 08-14-20, 08:10 AM
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Originally Posted by Pop N Wood View Post
Jagwires.

But I don't know that it is your cables. The whole point of compressionless cables is to get rid of the lever flex that comes from compressing the cable housings. Brakes should go from off to on with very little movement. Just like using stainless wrapped brake hoses on a car.

sounds to me like you need some better pads. I like kool stop pads with my spyres. Make sure your rotors are clean as well. Deglaze them with a sander using fine grit garnet sandpaper.
Possibly better pads would help*, but even getting the pads to touch the disc feels unusually stiff. Thats why I get the impression the cables has more than normal friction. Im Inclined to try out the road pro kit from Jagwire, but its expensive and id like some confirmation that its actually good before spending more money and more time tinkering with those damned brakes.

*I already did try other pads. TRP stock is semi metallic. I tried Shimano organic. Stopping is about the same but the organics squeal a bit less. No revolution tho.

Last edited by Racing Dan; 08-14-20 at 08:17 AM.
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Old 08-14-20, 08:16 AM
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Every bike I own gets jagwire cables. Lots of other people will say the same. I used to get a set of brake cables and housings for $21, notice they are now $27.

BTW I love my TRP Spyres. I do find if I don't ride them for some time they seem to lose braking grip.
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Old 08-14-20, 08:19 AM
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Originally Posted by Pop N Wood View Post
Every bike I own gets jagwire cables. Lots of other people will say the same. I used to get a set of brake cables and housings for $21, notice they are now $27.

BTW I love my TRP Spyres. I do find if I don't ride them for some time they seem to lose braking grip.
Jaqwire has several different brake cables. What kind?
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Old 08-14-20, 09:16 AM
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Die redrawn cables, take 1 more step. the finished cable is pulled through a die flattening the round wires on the outside.
this would be don off the bulk spool , before fixing the head, & hot cutting to length..

In a bike shop we get reels of cables. for repairs & individual (no individual packaging) sales .

Other part , housing , low compression uses same bundle of wires on end as indexed shift housing,
but adds a kevlar braided sheath embedded in the plastic around it to resist the spike forces. braking creates.

In the US Jagwire is carried by QBP.. thru B&M dealers & online retail.





...
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Old 08-14-20, 01:55 PM
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Originally Posted by Racing Dan View Post
Jaqwire has several different brake cables. What kind?
This is the last set I ordered
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 08-14-20, 04:05 PM
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This is the stuff I use. https://www.amazon.com/Jagwire-Compr...s%2C158&sr=8-2

I'm sure you don't need 10 meters, but that is the correct housing. I just use Jagwire stainless cables with it.

I have the Spyres on 2 bikes and they are an impressive cable disc brake. Much better than the Shimano cable discs I have on my road bike bike and as good as the SRAM hydraulic brakes on another bike. (yeah, I have a lot of bikes)
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Old 08-15-20, 03:44 AM
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Thanks. KEB-SL is the housing that is in the PRO brake kit as well.

Did you have any issues with excessive stiffness. The housing I got from wiggle is VERY stiff and and a real faff to bend in shape for under the tape mount on a drop bar.

The PRO kit comes with two pieces of ordinary brake housing for those first few inches that has a tight radius, but im not sure how to replicate the splice between the the ordinary and compressionless housing, except for buying the kit. ??
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Old 08-15-20, 07:22 AM
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Originally Posted by Racing Dan View Post
So I have TRP spyres and they've never been great. Low brake "power" and a somewhat mushy lever feel. I changed cables to compression less cables from Wiggle, the Life line brand. Now they are firmer, but there appear to be a lot of friction in the cables and thus a very firm lever squeeze is required to stop. I just about had it with these brakes.

Any recommendations. Im thinking other, better cables but what kind?
You may need to adjust the pads inward. A ďmushy leverĒ is typical of the pads being too far away from the rotor. Disc brakes work best when the pad is just clearing the rotor. Automobiles just let them rub against the rotor but we donít have the power for that. Look at the gap between the rotor and the pad. You should just be able to see daylight in that gap.

Your lever should also only move slightly before the pads engage. A mechanical disc that is set up like a rim brake...i.e. pads donít engage until half lever throw...is always mushy and ineffective. Frankly, rim brakes have the same problem no matter what Saint Sheldon says.
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Old 08-15-20, 07:57 AM
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Originally Posted by Racing Dan View Post
Thanks. KEB-SL is the housing that is in the PRO brake kit as well.

Did you have any issues with excessive stiffness. The housing I got from wiggle is VERY stiff and and a real faff to bend in shape for under the tape mount on a drop bar.

The PRO kit comes with two pieces of ordinary brake housing for those first few inches that has a tight radius, but im not sure how to replicate the splice between the the ordinary and compressionless housing, except for buying the kit. ??
Just get the Pro kit. One of the things with compressionless housing like the Pro is importance of using the right ferrules. With some ferrules the linear wires can be pushed through the hole the inner passes through if the shape of the inside end isn't right . So at least with the kit you know you are good to go. Oh yeah, the short flex sections aren't normal cable, no coating and has the joiner swaged on the end.
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Old 08-16-20, 02:03 AM
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Originally Posted by Racing Dan View Post
The cable is as short as can be. The length in the package was barely enough. The bike has Tiagra road brifters and post mount calipers. Im not aware TRP makes any distinction between road or mtb.
Spyre are for road pull, Spyke are for linear pull.
Originally Posted by Racing Dan View Post
Possibly better pads would help*, but even getting the pads to touch the disc feels unusually stiff.
I've found that the return spring on the Spyre is very strong. Pull the lever then let it snap back. If it actually does snap back loudly and forcefully, then the spring is certainly overcoming any friction in the housing.

There's a video on YouTube where the person shows how to cut down the springs so they're not as strong. I did that with mine and lubed the internals while it was apart, and I'm so much happier with it. It was just the front since I have rim brakes on the back and the difference in spring return between the front and rear was drastic before I cut down the Spyre spring, now they're much better balanced.
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Old 08-16-20, 04:55 AM
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Originally Posted by Racing Dan View Post
Thanks. KEB-SL is the housing that is in the PRO brake kit as well.

Did you have any issues with excessive stiffness. The housing I got from wiggle is VERY stiff and and a real faff to bend in shape for under the tape mount on a drop bar.

The PRO kit comes with two pieces of ordinary brake housing for those first few inches that has a tight radius, but im not sure how to replicate the splice between the the ordinary and compressionless housing, except for buying the kit. ??
It is stiffer than regular spiral wound housing, but not so stiff that I can't form it to the bars with some electrical tape before wrapping the bars. I have not felt the need for the flexible sections that come with the kit, but I have found that I need to install it with no ferrule on the brake lever end for some brands of shifters.
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Old 08-16-20, 05:21 AM
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Thanks all. Very helpful. Ill give the pro kit a go. Modifying the spring looks interesting if somewhat involved. It is true tho, the spring is very stiff, for no apparent reason. TRP should rethink their strategy. Mandating proper compression free housing at the OEM level and a softer spring would go a long way saving the end user from a lot of frustration.
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Old 08-16-20, 08:12 PM
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I would go with Jagwire Elite Link kit and update the stock pads (KooStop or SwissStop) and possibly rotor especially if it is the stock TRP rotor. That will give you better braking. The Pro Kit is also fine with the same upgrades but the Elite Link is probably your best as those "beads" (as my co-worker and friend calls them) won't compress and the inner liner is slick and the cable is super polished and smooth so it will amp up the brake performance.

Yeah TRP should mandate better stuff but then again all the manufacturers should stop being so cheap and use better parts especially in the case of cables and housing for Fox (with Kashima coating) sake.
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Old 08-16-20, 08:30 PM
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Originally Posted by Racing Dan View Post
Thanks all. Very helpful. Ill give the pro kit a go. Modifying the spring looks interesting if somewhat involved. It is true tho, the spring is very stiff, for no apparent reason. TRP should rethink their strategy. Mandating proper compression free housing at the OEM level and a softer spring would go a long way saving the end user from a lot of frustration.
I donít have Spyres but I do have Spykes on a couple of bikes. The Spyres are just Spykes with a different arm on them. Iíve never found any problem with them. I donít find them to have a particularly strong or weak spring. I donít run compressionless housing nor do I feel the need. I donít run compressionless housing on any of my disc brakes and never felt that the brakes didnít work properly.

Originally Posted by veganbikes View Post
Yeah TRP should mandate better stuff but then again all the manufacturers should stop being so cheap and use better parts especially in the case of cables and housing for Fox (with Kashima coating) sake.
Itís not the manufacturer being cheap, itís the consumer. Paul Klampers are better brakes than TRP but I doubt most people would pay twice as much for them. I have 3 of them (1 pair on a bike and one bike with a disc front). Great brakes but I canít really say they work 2 times better than the TRPs I have.
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Old 08-16-20, 09:11 PM
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Originally Posted by cyccommute View Post
Itís not the manufacturer being cheap, itís the consumer. Paul Klampers are better brakes than TRP but I doubt most people would pay twice as much for them. I have 3 of them (1 pair on a bike and one bike with a disc front). Great brakes but I canít really say they work 2 times better than the TRPs I have.
I haven't used Paul Klampers though I do love Paul, in fact I am wearing a MiniMoto shirt right now and spent way too much buying Paul stuff for a new-ish 26" rim brake mountain bike like some cave person. However I can say with good housing and cables the Spyres are really excellent and I find better than my old BB7s but likely Paul and all his wisdom and CNC prowess designed something better than those at least.

I doubt they would pay twice as much and I doubt Paul could do such massive OEM orders without compromising something (not that he is incapable of greatness and expansion) but certainly the OEMs could upgrade the cables and housing without too much cost increase.
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Old 08-16-20, 09:17 PM
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Pac rim ships most bikes you buy, to US west coast ports..the components are collected from there ans assembled there

Buy a Bike Built in Europe and you might get more EU/UK components if your're willing to spend up..


In the up charge up grade; get machined aluminum bead and barrel segmented housing.. low compression and flexible..





.....

Last edited by fietsbob; 08-16-20 at 09:21 PM.
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