O termo "beam spider" é usado quando são usados alumínio, titânio e materiais de aço para os grupos de engrenagens. Encontrei referências na marca "Shimano", uma das mais renomadas.

Construction of the cassette employs “Beam Spider” technology, which conjures up an image of a laser-shooting arachnid in my mind. Alas, neither spiders nor lasers are used in the construction of this cassette. Instead, “Beam Spider” is just a oddly named buzz phrase describing the strategic use of aluminum, titanium, and steel materials for the gear clusters, which are attached to an alloy carrier. To be exact, the three largest cogs are aluminum, the next five are titanium, and the smallest four are steel.