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The Problem Solvers Bushnell Eccentric Bottom Bracket is the industry-leading design for chain tension adjustment on tandem and single-speed bikes equipped with eccentric bottom bracket shells. This tried-and-true design is easy to install and fine-tune to your ideal placement and holds standard, English threaded bottom bracket cups. The classic version features full-body, aluminum construction across the shell for maximum surface area friction and additional value, while the lightweight version features additional machining and drilling to reduce weight. Both styles of the standard width (66mm) come in black or silver, while the fat bike version (100mm) is silver.