For once I agree with Lenard Zinn - Road disk shortcomings

Discuss light weight issues concerning road bikes & parts.

by Weenie


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maddog 2
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by maddog 2

sugarkane wrote:Steel disks fade. When pushed really hard..
That is a Shity feeling.. When you go for the brakes hard and nothing happens.
Carbon rim brakes won't and don't fade. Sure there are plenty of other problems with over heating carbon rim brakes but there are plenty of differnt and just as awful issues with overheating disks..


Where is your evidence for all this?
You say you run rim brakes on your road bike but you seem to be passing comment on the performance of discs...

And to suggest that rim brakes don't fade - and carbon rims at that - suggests you've been on the sauce fella :beerchug:

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sugarkane
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by sugarkane

I've cooked front tires on my carbon wheels. Causing the tire to deform and evaporated large sections of glue on the rims too but have never been had any kind off brake fade..
When I used to race motor bikes it wasn't very hard especially with ome pads to get the brakes to fade.
I have a friend who races down hill and he has had it happen a few times.

I just don't know that they are a really worth the effort on a roadie..
I love rapid descending but it's also something you just don't normally do every day.
I had one of my mates decide very abruptly not to roll through a fast roundabout this morning..
I had to get on the front brakes pretty hard, i had the rear wheel skipping.. Don't really see how I need more power?

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brycerider
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by brycerider

I can see discs as a solution to carbon clincher overheating blowouts and better wet weather braking. But they need to be hydraulic and light. Cable discs are ok but not great.

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MichaelB
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by MichaelB

sugarkane wrote:I've cooked front tires on my carbon wheels. Causing the tire to deform and evaporated large sections of glue on the rims too but have never been had any kind off brake fade..
When I used to race motor bikes it wasn't very hard especially with ome pads to get the brakes to fade.
I have a friend who races down hill and he has had it happen a few times.

I just don't know that they are a really worth the effort on a roadie..
I love rapid descending but it's also something you just don't normally do every day.
I had one of my mates decide very abruptly not to roll through a fast roundabout this morning..
I had to get on the front brakes pretty hard, i had the rear wheel skipping.. Don't really see how I need more power?


It is not about more power. For the umpteenth time.

It's about all weather performance and better modulation.

If you had tried the same thing in the rain, with rim brakes, you'd be in hospital (as it takes a rev or two for them to work properly), but with discs you may have stopped (or slowed enough).

So, sugarkane, have you actually tied a road bike with discs in the dry and/or wet ?

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Juggler
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by Juggler

Teaser from Canyon...

http://www.facebook.com/photo.php?fbid= ... =1&theater" onclick="window.open(this.href);return false;
2012 Canyon Aeroad CF 8.0 Di2
2014 Canyon Ultimate CF SLX Di2


MichaelB
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by MichaelB

Pharmstrong wrote:http://www.canyon.com/eurobike2012/i/i/galerie/08.jpg" onclick="window.open(this.href);return false;


Yummy !!!

It looks like the new SRAM Hydo groupset too :up:

billysan
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by billysan

That looks really clean, best one so far . . .

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maddog 2
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by maddog 2

Image

yes tidy. Is that for 2013?

Still not quite as nice as this though IMO

Image

VNTech
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by VNTech

That's not Red hydro on the Canyon, at least not the levers. They're mechanical Red stuck on there for show. The calipers... well, there isn't enough info to say anything.
VeloNews Magazine/VeloNews.com tech

bikewithnoname
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by bikewithnoname

Both nice loking bikes, but seriously people lets get over the black bike thing it's so dull... :roll:

As for discs, there are pro’s and con’s obviously, but for me, assuming the weight isn’t punitive, I’d prefer discs as they offer consistent braking in all conditions (and it rains a lot here), that can’t be said of alu or carbon rims in the rain/sleet/snow
"We live in an age when unnecessary things are our only necessities." Oscar Wilde

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madmole
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by madmole

two small 140mm aluminium rotors can weigh a LOT less than two 28" aluminium rims re-inforced brake tracks or the extra carbon and resin needed to provide rim braking, and even with the weight of 2 small calipers (lighter than dual pivots I suspect) its still lighter than present rim brakes, offers better braking in all weathers

Yes you can fade a disk brake if your a ham fisted idiot, but you would have melted an inner by then with rim brakes. Wear is much less, disk pads are dead easy to change and cheaper than rim pads

Calipers can be tucked behind the forks and frame out of the airflow, cables can be routed internally easily

Wheels drop out instantly with no brakes to release and a slight buckle of the rim doesnt disable the bike

And of course those of us that have had disk brakes on other bikes for many years are aleady converted and cant wait. We know how much better disks are
Last edited by madmole on Mon Sep 10, 2012 9:03 pm, edited 1 time in total.
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HammerTime2
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by HammerTime2

Comments on this?
In http://velonews.competitor.com/2012/09/ ... kes_237490 , Leonard Zinn wrote:There is another issue I discovered at Eurobike, however, namely that handmade tubulars and open tubulars that have hand-glued tread are not made to deal with the amount of heat that some manufacturers are concerned might be produced by road disc brakes. I still am not sure what they mean, since you’re either skidding or not, but there’s another concern.

by Weenie


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