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Disc Brakes Letting Some Pros Down

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Disc Brakes Letting Some Pros Down

Old 05-16-22, 02:41 PM
  #26  
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Originally Posted by WhyFi View Post
Got it. So let me see if this sums it up, then -

You came across a statement from a pro rider that was so dumb that it didn't merit discussion. Since you wanted to generate a discussion, you decided to adopt the position of an intellectually challenged devil's advocate.

Is that about right?
I posted an article/story, that IS generating a lot of discussion.
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Old 05-16-22, 02:45 PM
  #27  
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Regarding the spokes - was there any chance he was riding non-metallic ones? The resin of carbon fiber spokes might not be high temperature stuff if it was going on a non-rim brake wheel and no one thought of disc temps.
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Old 05-16-22, 02:58 PM
  #28  
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Originally Posted by Miles2go View Post
I posted an article/story, that IS generating a lot of discussion.
A lot of discussion? The thread just limped in to a second page and more than half of the posts are clumsy devil's advocacy attempts or responses to them. Larry could flatulate and the resulting discussion would run laps around this.
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Old 05-16-22, 03:42 PM
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Originally Posted by WhyFi View Post
A lot of discussion? The thread just limped in to a second page and more than half of the posts are clumsy devil's advocacy attempts or responses to them. Larry could flatulate and the resulting discussion would run laps around this.
You assumed I was speaking about here on this forum; I wasn't.
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Old 05-16-22, 03:58 PM
  #30  
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Originally Posted by Miles2go View Post
I guess it is human nature to discount the word of someone having road racing as their actual profession, riding more miles than most everyone reading this article, having bikes which are maintained by some of the most skilled mechanics, etc.
Like that never happened before—for good reason.
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Old 05-16-22, 07:55 PM
  #31  
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I thought we just had a thread about this within the last month or two. The sad part about it is, every time one starts now, I'm thinking sock.
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Old 05-16-22, 08:02 PM
  #32  
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Originally Posted by Koyote View Post
Sometimes spokes just break.
This
not doubting he had some wheel issues/broken spoke; but blaming it on overheating rotors, seems about as far fetched as can possibly be.
To have some degree of metal failure, at the very extreme of the hub flange, without affecting any of the other aspects of the hub function (like sealed bearings) seems ... not likely.
The amount of heat would certainly cause other failures well before.
Not doubting there was a wheel issue - but likely one of poorly built and subject to unbalanced stresses - wheel.
Considering what the team mechs need to do for every bike, wheel, and backup bikes, wheels, everything else, one can;t expect a full detailed inspection of everything...
And spokes are known to break...
he wasn't the only rider who had a bad/tough day on BlockHaus, especially Tesfatsion - also rotor overheating ?
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Old 05-16-22, 08:05 PM
  #33  
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At the pro level, especially Pro Tour EVERY last thing should be getting checked after every stage. There are 8 riders and most teams have 5-6-7 mechanics for Grand Tours. Every bike, including spares, and every wheel get cleaned and looked at every day. Some of the GC guys have their own dedicated mechanic that only has to worry about their bikes. This **** gets taken very seriously.
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Old 05-16-22, 08:15 PM
  #34  
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Originally Posted by Miles2go View Post
I guess it is human nature to discount the word of someone having road racing as their actual profession, riding more miles than most everyone reading this article, having bikes which are maintained by some of the most skilled mechanics, etc.
I like my Domane with disc brakes, a pro bike racer would hate it. I like my Honda Civic, a pro stock car driver would hate it. Why would the average person eschew either one based on a pro's opinion when it suits the use of the average person?
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Old 05-16-22, 10:17 PM
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In the great words of coach Ron Washington "That's how baseball go" and I feel like that applies here.
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Old 05-16-22, 11:11 PM
  #36  
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Originally Posted by Miles2go View Post
You assumed I was speaking about here on this forum; I wasn't.
You started this thread on this forum to stimulate discussion somewhere else?
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Old 05-16-22, 11:36 PM
  #37  
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Originally Posted by Seattle Forrest View Post
You started this thread on this forum to stimulate discussion somewhere else?
Yeah, right. Might want to focus a little more, or not post, something.
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Old 05-16-22, 11:51 PM
  #38  
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Well I already broke all my spokes by using disc brakes so what else am I supposed to do?
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Old 05-17-22, 03:49 AM
  #39  
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Originally Posted by 79pmooney View Post
Regarding the spokes - was there any chance he was riding non-metallic ones? The resin of carbon fiber spokes might not be high temperature stuff if it was going on a non-rim brake wheel and no one thought of disc temps.
How much heat from the brake disc do you think actually conducts it's way through to the spokes? If you think about it for a few seconds you should realise it's a ridiculous notion that the spokes are going to get hot from braking. I would say the rider just didn't think enough before opening his mouth. He obviously had a spoke failure (spokes fail occasionally as we know) and made an uneducated attempt to link this failure to disc brake heat.

A more plausible theory (if we insist on linking this failure to disc brakes) is the extra torque applied to the wheel (more specifically through the spokes due to the load path) under braking with disc brakes vs rim brakes. The wheel should be designed with this increased braking torque in mind (along with the fork), but these are likely to be super-lightweight wheels riding a bit closer to the limit. Even so, we don't appear to be having a peloton wide issue here. Just one guy who had an unexplained spoke failure at a critical time. It's not like spokes have never failed before disc brakes appeared.
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Old 05-17-22, 05:29 PM
  #40  
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My guess is that there's a range of braking habits across the field, and perhaps those who practice very hard late braking, transfer more energy into the brakes, or at least put that heat into them in a more concentrated, and repeated fashion.
I wouldn't know if it's enough to fatigue the wheel, but it certainly might push the limits of the brakes, and occasionally send some riders off the road when they cannot slow enough for an upcoming turn.
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Old 05-17-22, 05:40 PM
  #41  
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Today I learned the problem with disc brakes is people can't slow down in time to turn.
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Old 05-17-22, 06:18 PM
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Originally Posted by Seattle Forrest View Post
Today I learned the problem with disc brakes is people can't slow down in time to turn.
Really. Which people? Wilco?
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Old 05-17-22, 06:23 PM
  #43  
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What is the physical mechanism by which heat is transferred from the pad/rotor interface to the spokes?
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Old 05-17-22, 06:24 PM
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Originally Posted by PeteHski View Post
How much heat from the brake disc do you think actually conducts it's way through to the spokes?
0.0000001 J/spoke
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Old 05-17-22, 06:38 PM
  #45  
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Originally Posted by Polaris OBark View Post
What is the physical mechanism by which heat is transferred from the pad/rotor interface to the spokes?
Osmosis?
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Old 05-17-22, 06:40 PM
  #46  
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Originally Posted by Miles2go View Post
Osmosis?
So in other words, you are just promulgating what you clearly realize is total nonsense to troll. Well done.
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Old 05-17-22, 06:53 PM
  #47  
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Originally Posted by Polaris OBark View Post
What is the physical mechanism by which heat is transferred from the pad/rotor interface to the spokes?
The heat is carried by pheromones. That's why this problem only affects young, virile pro riders and not old guys on Internet forums. I break several spokes per week, because I'm a veritable pheromone factory.
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Old 05-17-22, 06:55 PM
  #48  
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Originally Posted by Polaris OBark View Post
So in other words, you are just promulgating what you clearly realize is total nonsense to troll. Well done.
In other words, you are trying to put other words in my mouth. I shared a story and posed one of many possible viewpoints, for fun. Que the minions!!

I don't believe disc wheels cost a pro significant time across a race route, don't believe disc brakes transfer any significant heat to spokes, where did I say anything like that.
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Old 05-17-22, 07:02 PM
  #49  
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Originally Posted by Miles2go View Post
In other words, you are trying to put other words in my mouth. I shared a story and posed one of many possible viewpoints, for fun. Que the minions!!

I don't believe disc wheels cost a pro significant time across a race route, don't believe disc brakes transfer any significant heat to spokes, where did I say anything like that.
You provided implied or explicit support for the idea in posts 1,4, 40, and 45.
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Old 05-17-22, 07:28 PM
  #50  
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After his switch to rim brakes Wilco was able to get 4th on todays stage!

Rim brake for life!…

<whispers>

oh? Still rode those blades of death?

nevermind…
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