The Module 3 is a 700c diameter that will accept tires wider than most racers will find comfortable. It's intended for Hybrid, Cross, tandem, or touring bikes which is why it's available in only 36 of 40 spoke hole drillings. It has many of the MA40's rim characteristics. The Mod 3 CD is a Box shaped rim with flat sidewalls. After the extrusion has been rolled into the hoop shape the ends are joined using and aluminum insert into the cavity between the cross-tie and spoke bed walls.
The aluminum insert uses the surrounding rim ends as a tight fitting "sleeve" to retain and hold both end together. After joining the end the rim is drilled for the spoke and valve holes, and it is then given the "CD" (couche dure), hard anodizing surface treatment that leaves the rim in a dark Grey yet smooth to the touch finish
The Module 3 CD uses a two-piece, double wall eyelet 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 3 CD showed no post machining distortion from this peening process.
More specifics about the rim are available in the Rim Table.
Mod 3 CD 700c (Hole-36-40)
MAVIC MODULE 4
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