This comprehensive guide tells you everything you need to know about bottom brackets — from a breakdown of all the bottom bracket systems available and their compatibility with one another to how a bottom bracket works and how to stop a bottom bracket creaking, this guide has it all. Below we rundown each of the major bottom bracket systems currently available, along with advantages, disadvantages, notes on compatibility, and some input from their proponents on why they exist. Other widths may be named according to shell dimensions: Wider overall shell is also claimed to improve bearing support.
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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. In this post, Matt Wikstrom updates his original article from with a look at the range of bottom bracket and crank axle designs that are found on the market today and discusses the details that are important for matching one to the other. When I started working as a mechanic in the mids, there were essentially two types of bottom brackets for road bikes, English- or Italian-threaded. The only other thing that varied was the length and offset of the crank axle. Two things stand out from that time: first, servicing a bottom bracket was labour-intensive; and second, there were rarely any complications when fitting a new crankset to a frame.
Bottom Bracket Identification
The bottom bracket on a bicycle connects the crankset chainset 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 spindle and cranks to rotate. The chainrings and pedals attach to the cranks.
Specialized bottom brackets have been confusing our customers for some time now. OSBB is a narrower version of PressFit 30, sharing the same inner diameter of 46mm, but reducing the shell width to 61 versus the PF30 road standard of 68mm. I think the original explanation was that this was done to be able to offer a narrower Q-factor on the cranks, but I will also accept the explanation 'Just because we can The confusion starts because the above standard applies to carbon bikes only.