The bottom bracket, or 'BB' as it often gets shortened to, is the humble bearing which supports the rotation of the cranks. This out of the way components tucked mostly out of sight between the crank arms has morphed to include nearly a dozen different styles and sizes. Even so, the traditional threaded BSA threaded version remains the most popular, and for good reason, it works and is easy to fit so this guide concentrates on this type. Lots of wet weather riding will encourage the ingress of water into the frame, where gravity will ensure it finds its way to the lowest component in the frame, the bottom bracket. The sitting water will eventually find its way past seals and begin rusting the steel bearing shells. If you're out in the rain a lot, do your bottom bracket a favour
The complete guide to bottom bracket standards
The complete guide to bottom bracket standards - BikeRadar
Note: we order these as they're ordered so please allow a couple extra days for processing. You buy BBs to match the crank. The length also affects which front derailers work. If you have one of our bikes, measure it. It's probably a If you have a Shimano non-mountain front derailer, it surely is. If you're not replacing anything AND you want to use a Shimano mountain front derailer and one of our cranks, get a
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