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Cannondale's tests of disks and QRs
At last, I've got hold of a report of Cannondale's disk brake/QR test
(you may recall that the CPSC asked them for help last year). It makes interesting reading. They tested a single fork/QR/brake combination. None of the components are named, although the brake seems to be Magura Louise (the brake _pads_ are described as such). The bicycle was secured in a test rig with powered rollers under each wheel, rotating at 15.5mph. I'm not going to type it all in, but this section is taken directly from the test description: "A light hand force of 5 lbs was applied to the brake lever every 10 seconds for 3 seconds duration. This caused braking torque to be applied to the wheel. The drums had 3 equally-spaced cleats (0.5" high the same as those used on wheel fatigue test T027) to create bumps for the front wheel to go over." And then we have: "Conclusion: "The conclusion is that the braking action of disc brakes is not causing the quick release mechanism to unscrew. This test is unable to cause loosening. At this time there are no reasons to believe that anything is missing or over constrained in this test." James -- If I have seen further than others, it is by treading on the toes of giants. http://www.ne.jp/asahi/julesandjames/home/ |
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