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Bottom bracket
Videos
The bottom bracket on a bicycle connects the crankset to the bicycle and allows the crankset to rotate freely. It contains a spindle to which the crankset attaches, and the bearings that allow the spi
A bottom bracket in a bicycle. The crankarms and chainring are attached to the spindle of the bottom bracket, which is installed in the bottom bracket
A bottom bracket in a bicycle. The crankarms and chainring are attached to the spindle of the bottom bracket, which is installed in the bottom bracket shell. The bottom bracket shell is an integral part of the bicycle frame. This is typical of modern frame designs, and different from the much older designs that gave the bottom bracket its name. In those designs - now obsolete - the bottom bracket was a separate piece bolted onto the frame.
Aerozine ceramic external bottom bracket bearing cups for BSC/ISO standard, that is M34.798×1.058 mm (1.37″-24 TPI) threads and a 68 mm wide bottom br
Aerozine ceramic external bottom bracket bearing cups for BSC/ISO standard, that is M34.798×1.058 mm (1.37″-24 TPI) threads and a 68 mm wide bottom bracket shell
Plain (threadless) bottom bracket shell of Royal Enfield Revelation houses Bayliss Wiley unit bottom bracket
Plain (threadless) bottom bracket shell of Royal Enfield Revelation houses Bayliss Wiley unit bottom bracket
Bayliss Wiley unit bottom bracket
Bayliss Wiley unit bottom bracket
Hirth joint
Videos
A Hirth joint or Hirth coupling is a type of mechanical connection named after its developer Albert Hirth. It is used to connect two pieces of a shaft together and is characterized by tapered teeth th
Bottom bracket
…which has both crank arms permanently attached to halves of the spindle (called semi-axles), which then join in the middle of the bottom bracket with a Hirth joint and a bolt. Bicycle frames utilizing pressed bearing standards do not have any threads inside the bottom bracket shell. The bottom bracket is pressed…
Hirth joint made from anodized aluminum to show the meshing of the teeth
Hirth joint made from anodized aluminum to show the meshing of the teeth
Hirth joint (disassembled) between the semi-axles of a Campagnolo Ultra-Torque crankset
Hirth joint (disassembled) between the semi-axles of a Campagnolo Ultra-Torque crankset
Industrial Hirth coupling showing the precision-ground radial teeth and the ring-shaped tooth arrangement.
Industrial Hirth coupling showing the precision-ground radial teeth and the ring-shaped tooth arrangement.