"bomba" <
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http://www.singletrackworld.co.uk/article.php?sid=1005
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I think that the danger is much bigger for the front brake, because the position of the rear brake
is different, so the force generated by the brake is not directed vertically,but it is - almost -
horizontal, how much horizontal it is, it depends from the position of the brake: if it is
vertically above the hub, the force will be horizontal, if it is not, the resultant force will try
to move down the hub
http://www.rothar.com/160303.htm
From: James Subject: Disc brakes and QRs Yes, and I'm in the same position as you. I don't think
it's a big safety issue, but in my case it is a slightly annoying one. It depends on how the
dropouts are angled relative to the disk calliper, and my bike (Ventana El Conquistador tandem) is
particularly bad, with rearward facing dropouts which are at exactly the worst possible angle for
the disc brake. The maker soon realised the error and changed to more conventional vertical ones. If
only major fork manufacturers were so responsive.... That is another reason why I am particularly
aware of the disk brake issue - our rear wheel occasionally slips a bit although now I do the QR up
bloody tight and it's been ok for some time. It's similar to QRs with horizontal dropouts for
singlespeeding - you can just about get away with it, but slippage is a headache (rear wheel slip
while honking up a big hill is not a matter of life and death though). I wouldn't trust my life to
the rear wheel not slipping, but its not a big safety issue in my view since even if the rear wheel
slips sideways a bit or pulls out completely, this is only going to cause a skid and not a headfirst
plummet to the ground (especially on a tandem with the long stable wheelbase). I don't think
different disk calliper types will make a significant difference, it's really just a matter of
geometry. The open fork ends should point directly away from the calliper itself, rather than being
nearly parallel to the tangent.