Warning: Bike Geek Post! Most cyclists have a certain bike part they tend to destroy. OK, some, like Scott Pauker, seem to destroy most everything, but for me it’s bottom brackets. This post isn’t meant to start a which BB is better debate, we’re all at the mercy of the manufacturers and their latest “standards”. For touring I’ve settled on the external bearing standard, because it’s currently the most widely used and easiest to replace. Also, unlike square taper bottom brackets, one size fits most, with the right adapters.