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http://singletrackworld.com/2013/12/sram-road-hydraulic-brake-recall-stop-u...
See here folks, they don't seem to work below a certain temperature.
In reply to Timmd:
Odd that only road brakes are effected given that you would have thought they would copy the tech from the Elixir MTB range
Odd that only road brakes are effected given that you would have thought they would copy the tech from the Elixir MTB range
In reply to balmybaldwin:
Who knows, maybe it's to do with the size and shape of the seals needed to fit hydraulics into road shifter and brake units?
It could be anything that we wouldn't have thought of, I haven't a clue...
Who knows, maybe it's to do with the size and shape of the seals needed to fit hydraulics into road shifter and brake units?
It could be anything that we wouldn't have thought of, I haven't a clue...
Post edited at 13:44
In reply to Timmd:
All I can think of would be the seals being too rigid/brittle and failing at low temp. If a calliper seal leaked and contaminated the pads this would result in in pretty much no brakes.
All I can think of would be the seals being too rigid/brittle and failing at low temp. If a calliper seal leaked and contaminated the pads this would result in in pretty much no brakes.
In reply to Enty:
You'd think they'd make them a bit more rounded, and silver maybe?
They look quite utilitarian in shape to me.
(..for the UKC computer, this is some text, just less of it before having to write this...)
> Thank got the uglyness put me off buying that groupset
> E
You'd think they'd make them a bit more rounded, and silver maybe?
They look quite utilitarian in shape to me.
(..for the UKC computer, this is some text, just less of it before having to write this...)
Post edited at 21:50
In reply to Timmd:
What's going on UKC, keep seeing different messages of mine?
Ah, no I don't.
What's going on UKC, keep seeing different messages of mine?
Ah, no I don't.
Post edited at 22:17
In reply to balmybaldwin:
One of the press releases from SRAM said that it was the master cylinder seals that can fail in sub-zero conditions - so the ones in the shifter not the (Elixir-style) caliper.
> Odd that only road brakes are effected given that you would have thought they would copy the tech from the Elixir MTB range
One of the press releases from SRAM said that it was the master cylinder seals that can fail in sub-zero conditions - so the ones in the shifter not the (Elixir-style) caliper.
Post edited at 08:51
In reply to Timmd:
You don't need to stop using them, just for the time been don't ride em in sub zero temperatures, and get the replacement seals of sram and refit simple, innit?
You don't need to stop using them, just for the time been don't ride em in sub zero temperatures, and get the replacement seals of sram and refit simple, innit?
In reply to johnj:
That they don't need to tell people to stop using them.
Thought that's what you had in mind. ()
That they don't need to tell people to stop using them.
Thought that's what you had in mind. ()
In reply to Timmd:
Well obviously Sram would have to do a full recall, however as the seals are at fault all they'd do is take returns and fit new seals and reissue.
fitting seals in bike brake systems is really easy just like a technical version of changing an inner tube, so I just proposed an alternative solution, however I understand why people would want the factory re-issue job
Well obviously Sram would have to do a full recall, however as the seals are at fault all they'd do is take returns and fit new seals and reissue.
fitting seals in bike brake systems is really easy just like a technical version of changing an inner tube, so I just proposed an alternative solution, however I understand why people would want the factory re-issue job
In reply to Timmd:
Saying that though it is possible that it is also a tolerance issue on the slots that the seal fit into, so it may be a full retooling setup, which is a completely different scenario.
Saying that though it is possible that it is also a tolerance issue on the slots that the seal fit into, so it may be a full retooling setup, which is a completely different scenario.
In reply to Timmd:
Please, Please. Please call the upgraded groupset something space shuttle related, keep old Feynman happy in his grave
Please, Please. Please call the upgraded groupset something space shuttle related, keep old Feynman happy in his grave
In reply to balmybaldwin:
Not so odd, the Elixirs are crap too!
> Odd that only road brakes are effected given that you would have thought they would copy the tech from the Elixir MTB range
Not so odd, the Elixirs are crap too!
In reply to Luke90:
Youre not wrong, but they are reliable. What I dont understand is why virtually every mtb comes with them....the shimano slx and up are so much better, as are formula etc
Youre not wrong, but they are reliable. What I dont understand is why virtually every mtb comes with them....the shimano slx and up are so much better, as are formula etc
In reply to balmybaldwin:
Rockshox and Sram and Avid are all part of the same conglomerate, I guess if Rockshox gets put on a bike it gives an opening for Avid brakes to be as well, or Sram gears, and visa-versa...
Rockshox and Sram and Avid are all part of the same conglomerate, I guess if Rockshox gets put on a bike it gives an opening for Avid brakes to be as well, or Sram gears, and visa-versa...
Post edited at 14:03
In reply to Timmd:
that's no excuse for putting crap kit on expensive bikes... and probably why I've go Fox, shimano and Formula (and a big bill to pay off)
that's no excuse for putting crap kit on expensive bikes... and probably why I've go Fox, shimano and Formula (and a big bill to pay off)
In reply to balmybaldwin:
Don't look at me, I don't spec things. ()
No it isn't an excuse..
> that's no excuse for putting crap kit on expensive bikes... and probably why I've go Fox, shimano and Formula (and a big bill to pay off)
Don't look at me, I don't spec things. ()
No it isn't an excuse..
Post edited at 14:05
In reply to Timmd:
who on earth would go biking in sub-zero temps anyway??
Certainly not me…opposite problem where i am…was climbing in 40C last weekend
who on earth would go biking in sub-zero temps anyway??
Certainly not me…opposite problem where i am…was climbing in 40C last weekend
In reply to Kimono:
I've had ice forming in my water bottle while on my road bike in the past, probably due to wind chill.
You get beautiful days in the Peak District when it's cold and clear.
I've had ice forming in my water bottle while on my road bike in the past, probably due to wind chill.
You get beautiful days in the Peak District when it's cold and clear.
Post edited at 12:17
In reply to Timmd:
I've had ice forming in my water bottle while on my road bike in the past, probably due to wind chill.
I don't think wind chill has any input into water freezing and it is solely down to the ambient temperature.
I've had ice forming in my water bottle while on my road bike in the past, probably due to wind chill.
I don't think wind chill has any input into water freezing and it is solely down to the ambient temperature.
In reply to FactorXXX:
Any warm object will cool faster in a draught. See Newton's Law of Cooling.
That's why you blow on stuff to cool it - gets the heat away from the object quicker.
Any warm object will cool faster in a draught. See Newton's Law of Cooling.
That's why you blow on stuff to cool it - gets the heat away from the object quicker.
In reply to Chris Harris:
Windchill isn't applicable to inanimate objects, it's a perceived feeling of temperature on the surface of the skin.
A water bottle would cool faster, but the water in it would not freeze unless the ambient temperature was below freezing, no matter how hard you blew on it!
Windchill isn't applicable to inanimate objects, it's a perceived feeling of temperature on the surface of the skin.
A water bottle would cool faster, but the water in it would not freeze unless the ambient temperature was below freezing, no matter how hard you blew on it!
In reply to Martin1978:
If the bottle was open and the wind was causing molecules to evaporate would the energy taken to cause the surface molecules to evaporate result in a decrease in the temperature of the liquid? Just like when you sweat or if you put a damp cloth over a can?
> Windchill isn't applicable to inanimate objects, it's a perceived feeling of temperature on the surface of the skin.
> A water bottle would cool faster, but the water in it would not freeze unless the ambient temperature was below freezing, no matter how hard you blew on it!
If the bottle was open and the wind was causing molecules to evaporate would the energy taken to cause the surface molecules to evaporate result in a decrease in the temperature of the liquid? Just like when you sweat or if you put a damp cloth over a can?
In reply to Enty:
But that's because more bollocks gets spoken about windchill on UKC than anything else. I think anyone who mentions windchill without understanding basic physics should face an immediate 5 match ban from UKC.
But that's because more bollocks gets spoken about windchill on UKC than anything else. I think anyone who mentions windchill without understanding basic physics should face an immediate 5 match ban from UKC.
In reply to Martin1978:
No, it's real! As above, Newton's law of cooling
That's windchill
but the water in it would not freeze unless the ambient temperature was below freezing, no matter how hard you blew on it!
Correct.
> Windchill isn't applicable to inanimate objects, it's a perceived feeling of temperature on the surface of the skin.
No, it's real! As above, Newton's law of cooling
> A water bottle would cool faster,
That's windchill
but the water in it would not freeze unless the ambient temperature was below freezing, no matter how hard you blew on it!
Correct.
In reply to Enty:
Cool, today I've learnt something about windchill, and also another way of starting a debate almost as fierce as Peak v Peaks.
()
Cool, today I've learnt something about windchill, and also another way of starting a debate almost as fierce as Peak v Peaks.
()
In reply to TobyA:
But that's because more bollocks gets spoken about windchill on UKC than anything else. I think anyone who mentions windchill without understanding basic physics should face an immediate 5 match ban from UKC.
Would it being on a treadmill (or bike equivalent) make any difference?
Also, would a Southern Hemisphere location such as the Falklands have any impact?
But that's because more bollocks gets spoken about windchill on UKC than anything else. I think anyone who mentions windchill without understanding basic physics should face an immediate 5 match ban from UKC.
Would it being on a treadmill (or bike equivalent) make any difference?
Also, would a Southern Hemisphere location such as the Falklands have any impact?
In reply to MG:
Newton's law of cooling makes no mention of windchill "the rate of change of the temperature of an object is proportional to the difference between its own temperature and the ambient temperature" This transfer of heat may be from convection, conduction or radiation.
No, that's forced convection. Windchill is a perceived drop in temperature by the flow of air over the skin. Unless inanimate objects have skin and can perceive then windchill is not the correct term.
I know, because THAT is Newton's Law of cooling
> No, it's real! As above, Newton's law of cooling
Newton's law of cooling makes no mention of windchill "the rate of change of the temperature of an object is proportional to the difference between its own temperature and the ambient temperature" This transfer of heat may be from convection, conduction or radiation.
> That's windchill
No, that's forced convection. Windchill is a perceived drop in temperature by the flow of air over the skin. Unless inanimate objects have skin and can perceive then windchill is not the correct term.
> but the water in it would not freeze unless the ambient temperature was below freezing, no matter how hard you blew on it!
> Correct.
I know, because THAT is Newton's Law of cooling
In reply to TobyA:
Maybe a definition of windchill should be agreed upon before deciding if it's balls, or whether it's and understanding of physics or physiology that is required
Maybe a definition of windchill should be agreed upon before deciding if it's balls, or whether it's and understanding of physics or physiology that is required
In reply to Timmd:
Not that I'd troll, but it's kind of entertaining, and interesting too.
> Cool, today I've learnt something about windchill, and also another way of starting a debate almost as fierce as Peak v Peaks.
> ()
Not that I'd troll, but it's kind of entertaining, and interesting too.
In reply to Timmd:
Not that I'd troll, but it's kind of entertaining, and interesting too.
Chill and try not to wind people up in future...
Not that I'd troll, but it's kind of entertaining, and interesting too.
Chill and try not to wind people up in future...
In reply to FactorXXX:
Otherwise all that natural warmth will just evaporate.
> Not that I'd troll, but it's kind of entertaining, and interesting too.
> Chill and try not to wind people up in future...
Otherwise all that natural warmth will just evaporate.
In reply to Martin1978:
Windchill is an example of NLC, which is a description of forced convection. Windchill isn't a perception of more rapid cooling, it *is* more rapid cooling.
> Newton's law of cooling makes no mention of windchill "the rate of change of the temperature of an object is proportional to the difference between its own temperature and the ambient temperature"
Windchill is an example of NLC, which is a description of forced convection. Windchill isn't a perception of more rapid cooling, it *is* more rapid cooling.
In reply to Martin1978:
Oh, and NLC is just convection, not radiation (which is non-linear). Strictly convection is a form of conduction (between a solid and fluid) but it is normally thought of as a separate heat transfer mechanism.
Oh, and NLC is just convection, not radiation (which is non-linear). Strictly convection is a form of conduction (between a solid and fluid) but it is normally thought of as a separate heat transfer mechanism.
Post edited at 22:55
In reply to MG:
We shall have to agree to disagree on the definition of windchill
Either way, it will be a long time before I revert to hydraulic brakes, so no need to panic :p
We shall have to agree to disagree on the definition of windchill
Either way, it will be a long time before I revert to hydraulic brakes, so no need to panic :p
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