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This article will discuss the removal and installation of the common cartridge bottom brackets of the three-piece cranksets. Most cartridge bottom brackets are held by retaining rings or cups on either side. See Adjustable-Type Bottom Brackets.
The evolution of road bikes may have provided cyclists with frames that are lighter, stiffer and more aerodynamic, but there has also been a substantial increase in the number of bottom bracket and crank axle designs. The once ubiquitous threaded bottom bracket shell has given way to larger threadless designs while the diameter of crank axles has also grown. Both may have helped elevate the performance of contemporary road bikes but consumers have been left to contend with myriad options and some frustrating incompatibilities.
Posted by Ard Kessels on May 23, The good old bottom bracket, the silent work horse, hidden deep down inside the bicycle. Well, silent is referring to the ideal world in this case.
Bottom bracket service falls into one of two categories: you either change them with a new one or exchange bearings. Other brands do sell replacement bearings or seals to get the job done. Bikes with threadless bottom brackets PF30 or similar require you to punch out your old bearings using a BBT
This guide will teach you everything you need to know about. The square taper bottom bracket substituted using a cotter pin to secure the crank to the spindle with bolts into the spindle. But if your cottered crank setup becomes unusable in one way or another, then upgrading to a square taper bottom bracket will be the go.