Author Topic: Cable disc brakes  (Read 1947 times)

ElyDave

  • Royal and Ancient Polar Bear Society member 263583
Cable disc brakes
« on: May 26, 2019, 10:59:34 am »
I've used the BB7 Roads before, but others have also suggested TRP Spyre.  The TRP ones are about £20 more expensing, without rotors whic is not so much of an issue as I have two spare rotors anyway.

Question is, are the TRP's £20 better?

These are to be used in the rebuild of my Cruzbike post crash
“Procrastination is the thief of time, collar him.” –Charles Dickens

Re: Cable disc brakes
« Reply #1 on: May 26, 2019, 11:17:56 am »
IMHO the answer is 'no'.

cheers

Torslanda

  • Professional Gobshite
  • Just a tart for retro kit . . .
    • John's Bikes
Re: Cable disc brakes
« Reply #2 on: May 26, 2019, 11:58:54 am »
BB7 are - with regular maintenance - probably the best cable calipers. Limited rotor choice because the tangs on the pads can foul but as long as you use simple 6 bolts they're strong and easy to fettle. One of the very few calipers that allow asjustment of both pads independently.

TRP have a (possibly) over complex system which uses twin levers to apply pressure to both pads evenly as opposed to the disc warping of BB7 and other 'single pull' calipers. They require - at least IMO - stripping and coating in anti-sieze before use. As long as they are maintained they give good feel and reasonably long life. Several uber/Roo riders have used them and the rate tey break stuff is frightening!

Perhaps you would consider the TRP HyRd? Cable operated, dual piston hydraulic brakes with the master cylinder piggy backed on the caliper. Again, keep them clean and adjusted correctly and you will have powerful and reliable brakes. They do however require 'compressionless' outer cable and are not cheap but what price good stoppers?
VELOMANCER

Well that's the more blunt way of putting it but as usual he's dead right.

Re: Cable disc brakes
« Reply #3 on: May 26, 2019, 12:24:45 pm »
I have both, my experience is no difference in stopping power, BB7's a lot easier to live with. other difference is the TRP's are sleek compared to the Avids, if you have to fit around something like a rack that helps.
Are you looking for long or short pull?  If long MTB type, the TRP version is Spyke and the price difference between those and MTB BB7's is more than the difference between the short pull road versions.

ElyDave

  • Royal and Ancient Polar Bear Society member 263583
Re: Cable disc brakes
« Reply #4 on: May 26, 2019, 12:40:49 pm »
Cheers all, road versions here, TRP road levers on a recumbent.

I've used BB7 roads on my other recumbent and am happy enough with them, so will do so again based on this.  I can test mount one from the other bike to check rack clearance.

TYP HyRD - fugly as sin, I'm not fouling my bike with those  :hand:
“Procrastination is the thief of time, collar him.” –Charles Dickens

ElyDave

  • Royal and Ancient Polar Bear Society member 263583
Re: Cable disc brakes
« Reply #5 on: May 26, 2019, 01:06:39 pm »
found them cheapest at Spa Cycles.

Oddly they had the TRP Spyres cheaper than the BB7 S, but stuck with what I know.
“Procrastination is the thief of time, collar him.” –Charles Dickens

Re: Cable disc brakes
« Reply #6 on: May 26, 2019, 01:16:59 pm »
found them cheapest at Spa Cycles.

Oddly they had the TRP Spyres cheaper than the BB7 S, but stuck with what I know.
Did you get the S version?  What makes it worth £30 a caliper more than the standard road version?

ElyDave

  • Royal and Ancient Polar Bear Society member 263583
Re: Cable disc brakes
« Reply #7 on: May 26, 2019, 01:28:19 pm »
The S version is stainless steel and different finish - black will go better with the frame I think.  I've found it a very robust coating so far, not got a comparison with the standard version though.

The SL version has titanium components at 25g lighter.
“Procrastination is the thief of time, collar him.” –Charles Dickens

frankly frankie

  • I kid you not
    • Fuchsiaphile
Re: Cable disc brakes
« Reply #8 on: May 26, 2019, 04:16:15 pm »
I've used the BB7 Roads before, but others have also suggested TRP Spyre. 

Question is, are the TRP's £20 better?

Not better at all - regardless of price, the BB7s have more stopping power and hold their adjustment better.

That said, there are pros and cons.  The biggest pros for the Spyre are:
* initial setup and centring of the calipers much simpler than the BB7.
* use of 'standard' Shimano-fit pads gives a much bigger after-market choice of materials/prices, better availability if caught out on tour.
It's not dark yet but it's getting there.

quixoticgeek

  • Mostly Harmless
Re: Cable disc brakes
« Reply #9 on: May 26, 2019, 07:03:20 pm »
The main issue I've had with my TRP Spyres is that getting replacement pads is a right faff. The TRP ones that come with the calipers are great, but noone sells them. I've tried some from uber bike, and from nuke proof, and neither has been as good as the ones that come with the caliper. I've just had something go wrong with the front caliper on my bike, I'm not sure what it is. I've ordered a new one, will then service the old one and use it as a spare, or put it on the new bike.

J
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mcshroom

  • Mushroom
Re: Cable disc brakes
« Reply #10 on: May 26, 2019, 07:19:04 pm »
I bought a pair of these trp pads from Chainreaction a couple seeks ago month. They are listed as 'TRP Parabox' pads, but look identical to the Spyres to me. The pads are exactly the same shape as the Shimano B01S pads I had in a spares box, which are also supposed to fit.. - https://www.chainreactioncycles.com/trp-parabox-disc-brake-pads/rp-prod143202
Climbs like a sprinter, sprints like a climber!

bludger

  • Randonneur and bargain hunter
Re: Cable disc brakes
« Reply #11 on: May 27, 2019, 12:35:09 am »
I have trp spyres. Haven't had to swap the pads yet but they work terrifically and are very easy to keep adjusted and snug, I recommend them heartily. Especially doing a long hilly tour, all you need do if the draw becomes a bit long is pop a 3mm key into the caliper each side, tighten up, then half turn loose and continue riding. 30 second job max.
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Re: Cable disc brakes
« Reply #12 on: May 27, 2019, 05:36:14 am »
Another for TRP Spyres here. I've been using them for some time now and had no problems, great stopping, easy set up and easy to maintain.

Some people over complicate things.
Mind of a cyclist, body of a dart player.

Cudzoziemiec

  • Solar powered, tea fuelled cycle-wol
Re: Cable disc brakes
« Reply #13 on: May 27, 2019, 12:37:50 pm »
LBS told me the Spyre pads are the same as Deore, but that could be just in shape not compound.
A cup of tea is the perfect bridge between real life and cake.

quixoticgeek

  • Mostly Harmless
Re: Cable disc brakes
« Reply #14 on: May 27, 2019, 12:40:02 pm »
LBS told me the Spyre pads are the same as Deore, but that could be just in shape not compound.

Correct. Finding pads that fit isn't a problem, finding good pads that fit, that's my challenge...

J
--
Beer, bikes, and backpacking
http://b.42q.eu/

Re: Cable disc brakes
« Reply #15 on: May 27, 2019, 07:10:13 pm »
If it's pads you want, I've found these to be pretty good. https://www.discobrakes.com/?s=0&t=0&c=14&p=100&tb=001
Cruzbike V2k

Cudzoziemiec

  • Solar powered, tea fuelled cycle-wol
Re: Cable disc brakes
« Reply #16 on: May 27, 2019, 08:30:25 pm »
If it's pads you want, I've found these to be pretty good. https://www.discobrakes.com/?s=0&t=0&c=14&p=100&tb=001
What advantage do those semi-metallic pads have over sintered or organic? I've understood that sintered gives better performance in wet weather, organic lasts longer and wears the pads less. How do semi-metallic fit into this range?
A cup of tea is the perfect bridge between real life and cake.

quixoticgeek

  • Mostly Harmless
Re: Cable disc brakes
« Reply #17 on: May 27, 2019, 08:32:59 pm »
If it's pads you want, I've found these to be pretty good. https://www.discobrakes.com/?s=0&t=0&c=14&p=100&tb=001
What advantage do those semi-metallic pads have over sintered or organic? I've understood that sintered gives better performance in wet weather, organic lasts longer and wears the pads less. How do semi-metallic fit into this range?

I thought it was the other way round, and that Organic pads wore really quickly ?

J
--
Beer, bikes, and backpacking
http://b.42q.eu/

Cudzoziemiec

  • Solar powered, tea fuelled cycle-wol
Re: Cable disc brakes
« Reply #18 on: May 27, 2019, 08:37:22 pm »
Is it? I could have got it confused.
A cup of tea is the perfect bridge between real life and cake.

Re: Cable disc brakes
« Reply #19 on: May 27, 2019, 09:23:23 pm »
pads vary but in general

- organic- high wear rate in the wet, acceptable wear rate in the dry, can be kind to discs
- sintered- much lower wear rate in the wet.
- semi metallic-  like organic but can trade friction/wear rate/disc wear rate

There are at least a dozen different parameters by which disc pads can be rated and characterised, some of which are to some extent  contradictory, e.g. long wear life also means a longer time for pads to bed in, moreso if the discs are already slightly worn. No single pad type is strong in all areas, it is a question of choosing your priorities.

cheers

Kim

  • Timelord
Re: Cable disc brakes
« Reply #20 on: May 27, 2019, 09:46:29 pm »
The other advantage of organic pads is they're a bit less inclined to make rubbing noises.

I use sintered pads on my road-going recumbents, and they last for ages.  Not sure what's in my MTB's brakes, they're still on the stock pads.  Probably organic...
Careful, Kim. Your sarcasm's showing...

mcshroom

  • Mushroom
Re: Cable disc brakes
« Reply #21 on: May 27, 2019, 10:02:51 pm »
My MTB has the ones Halfords fitted on it, which are organic Shimano ones. The discs on it actually say to only use that sort of pad.
Climbs like a sprinter, sprints like a climber!

Re: Cable disc brakes
« Reply #22 on: May 27, 2019, 10:19:22 pm »
IIRC shimano call their organic pads 'resin' pads.  Some of their discs say 'resin pads only' and appear to be made of a slightly softer stainless steel.

cheers

LittleWheelsandBig

  • Whimsy Rider
Re: Cable disc brakes
« Reply #23 on: May 27, 2019, 10:23:44 pm »
HK has organic pads in the Shimano brakes on her Kinesis commuter. They seem to work well and last longer than the 105 chain and cassette but not nearly as long as the Almotion tyres.
Wheel meet again, don't know where, don't know when...

quixoticgeek

  • Mostly Harmless
Re: Cable disc brakes
« Reply #24 on: June 01, 2019, 10:00:28 pm »

Couldn't find an EV for the Spyre but did find a strip down diagram from another forum.

After swapping to a new caliper on the bike, I was willing to take the old one apart.



Seems the contents of the caliper is mostly road grime and dust...

There appears to be no grease on any of the innards. When I reassemble this, where should I be applying grease?

Something isn't right with one of the caliper adjust bolts. I'm hoping the thread isn't stripped, but won't know for sure. Until I've cleaned it all.

J
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Beer, bikes, and backpacking
http://b.42q.eu/