Disc Brakes Letting Some Pros Down
#26
Zen Master
Thread Starter
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?
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?
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Ron - Tucson, AZ
Ron - Tucson, AZ
#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.
#28
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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.
#29
Zen Master
Thread Starter
You assumed I was speaking about here on this forum; I wasn't.
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Ron - Tucson, AZ
Ron - Tucson, AZ
#30
Like that never happened before—for good reason.
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#31
Senior Member
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.
#32
OM boy
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 ?
Ride On
Yuri
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 ?
Ride On
Yuri
#33
Senior Member
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.
#34
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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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"It is the unknown around the corner that turns my wheels." -- Heinz Stücke
"It is the unknown around the corner that turns my wheels." -- Heinz Stücke
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#35
Junior Member
In the great words of coach Ron Washington "That's how baseball go" and I feel like that applies here.
#36
Senior Member
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#37
Zen Master
Thread Starter
#38
Senior Member
Well I already broke all my spokes by using disc brakes so what else am I supposed to do?
#39
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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#40
Zen Master
Thread Starter
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.
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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Ron - Tucson, AZ
Ron - Tucson, AZ
#41
Senior Member
Today I learned the problem with disc brakes is people can't slow down in time to turn.
#42
Zen Master
Thread Starter
#43
What is the physical mechanism by which heat is transferred from the pad/rotor interface to the spokes?
#44
#45
Zen Master
Thread Starter
#46
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#47
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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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#48
Zen Master
Thread Starter
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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Ron - Tucson, AZ
Ron - Tucson, AZ
#49
Senior Member
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.
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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