Specific heat absorption capacity of disc brakes

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eCue
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Re: Specific heat absorption capacity of disc brakes

Post by eCue » Feb 03, 2018 3:45 am

The TRP Spire disc is working well in every respect. Solid feeling smooth without vibration quiet make that dead quiet and with good modulation.
Currently waiting for a bottom bracket cable guide to get the rear roller brake operating. Ive been using front disk exclusively these last few days. At first tried the brake lever in roller brake mode for a day.
It was spongy and required too much force to stop. Impossible to lock up in error and had a very long braking distance. Rather dangerous
V-brake mode felt so much better having both a sharp pull when needed and nice modulation. I have not had a error lock up and dont think I will. The Organic pads are silent and smoother then smooth , I can see why they are suggested up front.
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Re: Specific heat absorption capacity of disc brakes

Post by Chalo » Feb 03, 2018 2:31 pm

eCue wrote:
Feb 03, 2018 3:45 am
At first tried the brake lever in roller brake mode for a day.
It was spongy and required too much force to stop. Impossible to lock up in error and had a very long braking distance. Rather dangerous
V-brake mode felt so much better having both a sharp pull when needed and nice modulation.
My favorite levers to use with drums and roller brakes have been adjustable gain linear pull levers, like Avid Speed Dial or Dia-Compe PC-7 EXA. However, I feel that long blades are an advantage in this application, and linear pull levers generally have short blades.

So-called "compressionless" brake cable housing is really good at improving lever feel and brake response with drum or roller brakes. I didn't believe it until I tried it.
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Re: Specific heat absorption capacity of disc brakes

Post by amberwolf » Feb 04, 2018 2:44 am

Chalo wrote:
Feb 03, 2018 2:31 pm
So-called "compressionless" brake cable housing is really good at improving lever feel and brake response with drum or roller brakes.
Is that the kind with the full-housing-length "wires" paralleled around the circumference of the housing? (rather than the spiral-wrapped type)

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Re: Specific heat absorption capacity of disc brakes

Post by Chalo » Feb 04, 2018 10:04 am

amberwolf wrote:
Feb 04, 2018 2:44 am
Chalo wrote:
Feb 03, 2018 2:31 pm
So-called "compressionless" brake cable housing is really good at improving lever feel and brake response with drum or roller brakes.
Is that the kind with the full-housing-length "wires" paralleled around the circumference of the housing? (rather than the spiral-wrapped type)
Yes, but it differs from index shift housing in that the parallel wires are contained in a snug Kevlar jacket to keep the housing from bursting under high compressive load. Here's the kind I use.

I had encountered long lay cable housing before that promised compatibility with both brakes and shifters; it was marketed by Odyssey. But that stuff definitely wasn't stiffer in compression than good quality Bowden cable housing.
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Re: Specific heat absorption capacity of disc brakes

Post by Raisedeyebrows » Feb 05, 2018 12:42 am

I have the Jagwire housing on my cargo bike with BB7's, the stuff is worth the money, really stiffened up the braking response.

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Re: Specific heat absorption capacity of disc brakes

Post by Chalo » Feb 07, 2018 8:03 pm

Prototyped a new fork today for a super- heavyweight pedicab. We opted for dual 203mm discs, which was the main reason we had to make our own fork.
rps20180207_173222.jpg
rps20180207_173222.jpg (78.53 KiB) Viewed 111 times
That's a 29x2.1" tire on a 42mm wide rim.
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Re: Specific heat absorption capacity of disc brakes

Post by speedmd » Feb 07, 2018 9:35 pm

Nice! Like the look of the rotors mounted backwards.

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Re: Specific heat absorption capacity of disc brakes

Post by Chalo » Feb 07, 2018 9:39 pm

speedmd wrote:
Feb 07, 2018 9:35 pm
Nice! Like the look of the rotors mounted backwards.
Yep. Good thing there are no calipers on it yet.

I'm on the lookout for reasonably priced 8" rotors with a non-directional pattern to prevent the inevitable reverse installation of the symmetrical wheel by end users. Any ideas?
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Re: Specific heat absorption capacity of disc brakes

Post by speedmd » Feb 07, 2018 9:47 pm

Brakco? Closer to a bi directional design. Float points and outer slots not.
https://www.ebay.com/i/282773086090?chn ... 2056669164
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Re: Specific heat absorption capacity of disc brakes

Post by speedmd » Feb 07, 2018 10:25 pm

The Ashima looks to be more symmetrical at the float points.
https://www.ebay.com/itm/Ashima-Flotor- ... SwEetWAvqN
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Re: Specific heat absorption capacity of disc brakes

Post by speedmd » Feb 08, 2018 9:57 am

Origin looks to be fully symmetrical, but possibly some cbore at the mounting screws. Not sure outer slots on the lower cost option would be a issue. KCNC also with a nice lightweight design. https://www.ebay.com/itm/Origin-8-Speed ... SwVqlaHClC
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Re: Specific heat absorption capacity of disc brakes

Post by Chalo » Feb 08, 2018 11:53 am

Thanks for finding these.
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Re: Specific heat absorption capacity of disc brakes

Post by speedmd » Feb 08, 2018 12:25 pm

Chalo wrote:
Feb 08, 2018 11:53 am
Thanks for finding these.
No problem. Like the idea of dual rotors, have been playing with the idea and glad you posted as we have many near moto requirements here that can test these lightweights out for suitability. Even if you need to get some outer rings water jet'd out a bit more heavy duty, the center hub may become a standard for most here on ES.

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