American Machine Foundry - Journey Into History
Why the "B" designation, you ask? It stands for "beltdrive." When Willie G. and Lou Netz designed the FXB, they used it to introduce a beltdrive primary, thus creating a double beltdrive (one in the closed primary, one for the final drive). This wasn't new technology, since many early bikes used inner belts made of leather. Only the FXB carried it, and the idea was scrapped in favor of the primary chain we've all come to know.
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