BB sets or Bottom Bracket sets Archives - Online BicyclesOnline Bicycles ™ A bolt to bicycle store. Buy cycles online here!

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The bottom bracket or BB set connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely. It contains an axle that the crankset attaches to, and the bearings that allow the axle and cranks to rotate. The bottom bracket fits inside the bottom bracket shell. This is a junction of seat tube, down tube and chain stays as part of the bicycle’s frame.

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