Lightness―It is one of the essential features required of bicycle parts. Shimano has always pursued this eternal theme. Specifically, the lightness of the crankset, along with its rigidity, is a critical factor that greatly affects pedaling efficiency. Hollow crankarms achieved compatibility between these two contradictory features. The hollow-crankarm technology was first employed in the XTR M950 series launched in 1995. Subsequently, the hollow-structure technology continued to evolve and was named HOLLOWTECH in 1999. In 2004, HOLLOWTECH further evolved into HOLLOWTECH II, which achieved additional improvements in rigidity, weight reduction, and pedaling efficiency, by forming an integral structure consisting of bottom bracket and right crankarm.
Shimano's Centennial Teaser Site
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