The Open 4 CD has Mavic's "couche dure", hard anodized Grey finish for a surface treatment.
Again, this rim's metallurgical composition remains a Mavic kept secret. Each of the walls for this extrusion including the cross-tie wall exhibit a thin, delicate stability. The Open 4 is a "U" shape with sidewalls sloping out and upward from a narrower spoke bed wall achieving a flat sidewall for a braking surface for the upper third of the wall height. The Mavic Open 4 CD is an extremely popular 700c clincher rim used by many, many road bike riders including a few that work here. Mavic 700c diameter Road Racing clincher rims MAVIC OPEN 4 CD
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