Bottom Bracket Styles

Posted: December 8, 2016 by Mark in Uncategorized

Custom bicycles are complicated.  Part of my responsibility as a builder is to help you understand the various options.

Building a bicycle starts with the bottom bracket (aka the BB).  The BB is the part of the frame where the crank mounts.

This has always been an area with lots of options.  A lot of the choice comes down to the style of crank set and bottom bracket you wish to use.  I generally keep the four main styles of bottom bracket shell handy for builds.  When needed I will source additional styles so you are not really limited in any way.

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The four main styles are as follows:

  • PF30/73 – Mountain bikes with modern 30mm style cranks and press fit bottom brackets
  • PF30/68 – Road bikes with modern 30mm style cranks and press fit style bottom brackets
  • English/73 – Mountain bikes with older style cranks and threaded bottom brackets
  • English/68 – Road bikes with older style cranks and threaded bottom brackets

On my personal bikes I use PF30 because it really is a great setup allowing me to run run any of the modern crank or use older style cranks.  I also like that as a press fit the style there is really less to go wrong vs. threaded style.  A lot of people will argue about this but in my personal experience the press fit style has been more reliable.  Threaded style bottom brackets also work well but realize you will not have the option of running some of the newer cranks.

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