Bicycle bottom bracket evolution
While Si’s hollow aluminium cranks still follow the construction pattern established by their predecessors, BB30 differs in one significant respect from the Coda bottom bracket design, which was arguably the most prescient in recent cycling history.
Conceived by Magic Motorcycle Co.’s Alex Pong, the Coda design placed the bearings outboard of the bottom bracket shell in order to make for room for an oversized aluminium axle. It did so because Pong’s aim – and that of the designers of alternative bottom bracket
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