Originally Posted by
MrPolak
Can someone explain to me why discs are bad when they are so good?
From another perspective, they are bad because they can lead to liability problems.
Many bike manufacturers pay attention to potential liability issues.
Disc brakes have had some unexpected consequences that have led to lawsuits.
The QR is initially restrained by the retention lip on the fork (assuming it is present), however over time the slipping of the quick release leads it to unscrew, which is described here. Once it has unscrewed enough, it can be forced over the retention lip and the rider will crash.
Some further discussion of these and related issues here:
http://www.ne.jp/asahi/julesandjames...quick_release/
*******
In addition to the liability issues, there are the safety issues.
'The QR is initially restrained by the retention lip on the fork (assuming it is present), however over time the slipping of the quick release leads it to unscrew, which is described here. Once it has unscrewed enough, it can be forced over the retention lip and the rider will crash....'
So even with a retention lip there can be problems, and I would respectfully disagree with
Originally Posted by
NeilGunton
...The front disc brake puts a lot of tortion stress on the wheel, which tends to pull it out of the dropout, thus producing the possibility of a catastrophic crash on bikes with quick release hubs that haven't been tightened properly.....
and
Originally Posted by
NeilGunton
...since all front forks now seem to have "lawyer lips" which prevent the wheel from disengaging unless the quick release is manually loosened.....
which isn't always the case.