Missy Giove's QR pops open

Pilot error? Maybe, maybe not. Giove was riding a Manitou Skareb fork and XT disks in California on Wednesday. Cycle trainer Dave Smith was with her at the time and had earlier that day read the BikeBiz.co.uk 'QR/disc-brake' story and so was clued-up to the possibility (some) QRs and disc brakes may not mix. Missy's front QR had been "really tight." But, asks Brant Richards, would zip-ties not be a short-term answer?
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"I was riding with Missy Giove and Rick Sutton [vice president of global sales and marketing for Trixter, see http://www.bikebiz.co.uk/.../article.php?id=2908 href="http://www.bikebiz.co.uk/web/article.php?id=2908"] in some big redwood forest near San Francisco on Wednesday," Dave Smith told BikeBiz.co.uk.

"Missy's QR popped. She had definitely tightened it before the ride as she was doing some goofy stuff.

"The Skareb had the lawyer lips intact. [The] XT skewer [was] really tight. I'd actually mentioned your story to Rick when we were leaving the office."

On One's Brant Richards is not convinced the 'Missy incident' is the Annan theory found in the field.

"We don't know how Missy's QR popped open. She could have caught it trailside on something. It might well have been tight, but might not have been locked over centre.

"It could have been incorrectly installed, with the clamping surface not sitting properly in the dropout, and have settled loose, then flopped open.

"The problem now is people are now suspecting an Annan-type QR/disc problem, not the fact that something else - several other things - could have happened!

"We have a rear disc mount on our singlespeed jump frames, and the relationship of the disc and dropout slot means that certain riders have noticed the wheel being moved backwards by the force of the disc brake due to the forces involved. This is only when the wheel is clamped in place by a chaintug - a device to stop the wheel moving forwards - which spreads the clamping force over a large area. Use of just a good old track nut usually stops this in its tracks.

"I therefore don't discount the fact that the physics and my experience show that a wheel can be shifted in the dropout under braking load. But I do discount that a correctly installed QR of a correct over-centre-clamp type lock won't come undone unless it's disturbed on the trail."

And Richards has a cheap solution:

"Surely something as simple as zip tieing the QR in a closed position would stop all this. It's the bicycle equivalent of the axle nut split pin."

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