The Module 4 has been included in our work because there are a few riders in off road tandem, or touring conditions that need an extra wide 700c tire to go on a matching extra wide rim. The Module 4 is a double wall rim that has flat sidewalls and is made of a still held secret by Mavic series of aluminum alloy. After extruding the rim blank, the outer surfaces of the extrusion are high polished to a bright Silver aluminum finish then Clear anodized to preserve this bright finish
The blank is then rolled into the rim's hoop shape and the ends are joined using an aluminum insert pressed into the cavity of both ends between the cross-tie and spoke bed walls. Each of the ends acts like a tight fitting sleeve, using the rim contour, to hold the ends tightly in place. One of the Mod 4 specimens we used for writing purposes showed a slight, tiny and un-characteristic gap between the joined ends. The Module 4 uses two-piece, double wall eyelets to equalize the spoke nipple stress and help prevent nipple pull through failure.
Both eyelet pieces are stamped from sheet stainless steel, the upper eyelet piece is cup shaped, while the lower eyelet piece takes the form of a hollow rivet. The upper piece, having an oval seat, is inserted into the spoke hole from the interior, or tire side. The lower piece is set into the upper cup piece, with the lower piece protruding though the spoke bed wall. Force is applied to the top of the lower piece so a mandrel can flare the lower piece into a smooth round blossom that now holds both eyelet pieces firmly to the cross-tie and spoke bed walls. The spoke bed wall on the Module 4 showed no post machining distortion from this peening process.
More specifics about the rim are available in the Rim Table.
Module 4 700c (Hole-36-40-48)
MAVIC REFLEX ROAD RIM