Campag Disc Brakes - video

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fogman
Posts: 1066
Joined: Fri Oct 30, 2009 10:36 pm

by fogman

Apparently there was a rumor circulating about this around 2009.
http://www.timetriallingforum.co.uk/ind ... opic=35389


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XCProMD
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Location: Cantabria

by XCProMD

And it was BS.

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CanadianBiker
Posts: 98
Joined: Mon Mar 30, 2015 2:34 pm

by CanadianBiker

Man I can't wait to give my money to Campy, I want those bad! Has anyone seen any Bora disc wheels anywhere? I am searching the internet but coming empty, was hoping for a spy shot.

graeme_f_k
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by graeme_f_k

Few things here:

sychen - Campy Tech Shop is the shorthand used on development products for campagnolo's R and D dept - it's how most prototypes that are going to see the (public) light of day are branded, when designs are still being tested and finalised.

XCProMD / Calnago - you have it dead right XCProMD, in point of fact many hubs have been easily torsionally rigid enough to support the moments of torsional inertia involved for some years - Some manufacturers have laced the drive side radial and the NDS crossed on conventional, rim-brake rear wheels - with a sufficiently torsionally stiff design of hub shell and the right anchorage system on the crossed side (so that a fully un-loaded spoke can't escape it's anchorage) and a suitably designed anchorage on the radial side (that can allow a small amount, of the order of seconds of arc, movement) anyway), there is no reason not to build this way apart from the fact that building more conventionally is perhaps a bit "more right" as XCProMD terms it (I think I'd say "elegant"). In a conventional rear wheel, it allows a tad more clearance for the rear derailleur for instance.

benzebub - no, the partner isn't Shimano, nor is there any Shimano stockholding in Campagnolo SRL - that last is a matter of public record in Italy and is easily searched. Campagnolo have discussed design with other specialists in the marketplace but Shimano, at least insofar as the physical execution of the design, are not one of them. There are of course ongoing discussions all the time between a whole range of manufacturers about matters that will affect inter-compatibility, in pro races particularly ... it would take a brave manufacturer indeed to do something that was so radical as to not fit with any existing conventions - the once-proposed Shimano "10 millimeter" system springs to mind ...
A Tech-Reps work is never done ...
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fogman
Posts: 1066
Joined: Fri Oct 30, 2009 10:36 pm

by fogman

Since the UCI suspension of disc brake testing in the pro peloton last week, I am wondering if Campy Tech Lab will suspend their R&D of disc brakes as well.


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ergott
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by ergott

graeme_f_k wrote:and the right anchorage system on the crossed side (so that a fully un-loaded spoke can't escape it's anchorage) and a suitably designed anchorage on the radial side (that can allow a small amount, of the order of seconds of arc, movement) anyway), there is no reason not to build this way


This sounds like a perfect storm for spoke fatigue. Cycling spokes from loaded to any moment of un-loading will cause premature spoke fatigue and failure. It's been known to happen to left side spokes of rear wheels for a long time now.

XCProMD
Posts: 1123
Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

If the spokes have enough pretension they will never unload in a correctly designed hub-rim system, no matter which side is laced.

But anyway it is the stress range and the range spectrum that matters. It's splitting hairs but in reality what triggers spoke failure when crossing 0 tension is contact fatigue. Alpina has a solution that dramatically improves the fatigue contact resistance of the spoke and Campagnolo uses it.

Jhong
Posts: 10
Joined: Sat Feb 11, 2017 4:58 pm

by Jhong

Isn't Disk brakes are dangerous in downhill?
I using shimano ultegra brake,
Sometimes drastic downhill i suffer on my hands.

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