The two statement above are false. You can indeed get them tight enough to hold the wheel but they need to be quality QR's, like shimano. Modern QR's can have problems holding a wheel in either a track end or horiz dropout if they don't grab enough because they are designed for vert dropouts. The internal cam models like campy and shimano have a solid grip surface and enough torque to hold a SS or geared wheel in place.
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