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Stronger clamping force compared to open cam.
From Sheldon;
Despite the marketing hype associated with these "boutique" skewers, they are actually considerably inferior in functionality to the traditional type. They are often seen under rather prestigious names, as was the one photographed here. (I Photoshopped the logo off, so as not to pick on one particular brand.)
The exposed cam cannot be kept as clean and well-lubricated as the shielded one can.
In addition, the exposed cam has a larger diameter, (typically 16 mm vs. 7 mm for an enclosed cam) so the friction is acting on a longer moment arm (the radius of the cam.)
The result is that the exposed-cam type provides very much less clamping force for a given amount of hand force on the lever.
edscoble
hippy
It's how I bought it and I only had issues post-crash. I will be replacing the skewer because the fucker's bent anyway - I had to hammer it out. With any luck the fuckstains that don't maintain the roads will be paying for its replacement. Other than the obvious Shimano being better, why are closed cams grippier? engages physics nodding mode