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Machining, Polishing, Assembly





While robots are used for some of the machining and assembly processes, there are certain jobs that still must be done by skilled craftsmen to insure quality.

As would be expected, Dura-Ace demands the greatest number of hand finishing, assembly, and inspection operations of any Shimano component group.

The components are even polished by hand to mirror-like finish.



After assembly, the appearance and operation of every Dura-Ace component is carefully checked.

For example, the shifting action of each Dual Control Lever is carefully examined, and crank arms are CT scanned for possible internal flaws that can’t be detected with a visual inspection.

Through each stage of the process, skilled personnel make sure that each and every Dura-Ace component meets stringent inspection standards.