bottom bracket
nounEtymology From earlier bicycle designs, when it was a separate piece bolted onto the bottom of the frame. In modern designs the bottom bracket shell (or housing) is an integral part of the frame.
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Cycling, Hobbies, Lifestyle, Sports A bicycle part that connects the crankset (chainset) to the frame and allows the crankset to rotate freely.
- The chances are excellent that some of the material will fall down the seat tube and get into the bottom bracket, where it will make mincemeat of your crankset bearings (thought seats were simple, hah?).1972, Richard Ballantine, Richard's Bicycle Book, New York: Ballantine Books, page 139:
- Crucial to the crankset is the bottom bracket. Of all the bearings on a bike, the bottom bracket is the one that has to bear the heaviest load. Not only does the bottom bracket have to spin while you pedal, but it takes the force of all the twisting and turning that occurs during pedaling.2009, Dennis Bailey, Keith Gates, Bike Repair and Maintenance For Dummies, John Wiley & Sons, →ISBN:
- Related terms
- spindle