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Spider
From WikiPedalia
A spider is multi-armed part of a crank to which one or more chainrings are attached.
With most good quality cranks, the spider is an integral part of the right crank. Older, cheaper cranks commonly have a separate spider swaged to the right crank. Some newer cassettes also use a spider to connect the sprockets to the freehub body. This is done primarily to save weight.
