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PostPosted: Sat Feb 11, 2017 9:11 pm 
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Joined: Fri May 25, 2007 6:43 pm
Posts: 3286
TheKaiser wrote:
Even with standardized parts within a team, the clearances are simply too tight between a rotor and pads to simply rely on the same hub rotor combo, as a slightly undersized spacer, hub shell mounting face, or an out of plane locknut on a QR wheel will throw things into disarray unless you check each and every set.
TBH I suspect that within a team they'll have a set of go/no go gauges for the disc and caliper positions. One to locate into the drop out and caliper and another to drop over the locknut and disc face (doubled up front and rear of course). From that you can actually shim every single disc and caliper exactly the same.

If they aren't doing this, they need their heads looking at.


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Posted: Sat Feb 11, 2017 9:11 pm 


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PostPosted: Sun Feb 12, 2017 6:23 pm 
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Joined: Tue Aug 12, 2014 3:50 pm
Posts: 1015
Location: FIN
mattr wrote:
stormur wrote:
can't see relation between braking and caliper movement. braking force direction is obvious here, and 1 plane only.
One plane? Go back and look at the forces in three dimensions. Then the geometry of the caliper and mounting faces.


I don't have to go back anywhere. Perhaps you should. It is one plane force. Rotor is moving in one plane. pads are moving in 1 plane. Calipers doesn't move at all. It's not floating system.

_________________
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I can be wrong, and have plenty of examples for that ;)


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PostPosted: Sun Feb 12, 2017 7:39 pm 
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Joined: Fri May 25, 2007 6:43 pm
Posts: 3286
:roll:
How do you think the caliper resists being dragged around the axle once clamped to the disc?
There is a bending moment between the braking face and the mounting face of the frame. The bigger the offset the greater the moment. Until either the frame flexes (squealing brakes, odd wear patterns, relatively rapid fatigue failure) or the caliper moves.
Easiest way to minimise this bending moment is to reduce the offset as far as is physically possible. By putting the disc close to the frame.

As an added bonus you get improved bracing angles for the NDS spokes and more space for whatever system you use to mount the disc.

These moments and reaction forces are another reason for one piece calipers, you strengthen and stiffen a point where the flex would be noticeable and possibly annoying.


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