Bearings

  1. Bottom Bracket Pressfit and Creaking- An engineering Opinion

    If you are reading this you will have probably already come across the numerous posts by various individuals in Internet forums across the web.

    The issue of creaking bottom brackets has been blamed on the introduction of pressfit and directfit bottom bracket standards, where bearings either push directly into the bike frame or push into cups which are then pushed into the bike frame.

    General guidance varies from taking everything out and regreasing it to installing with extreme measures such as epoxy resin.

    Pressfit is not the problem and threaded is certainly not the answer...

    The reality is pressfit has nothing to do with creaking. There are many areas of a bike where bearings have a pressfit and there are no problems. For example, wheels, freehubs, pulley wheels and some headsets are pressfit yet they don't generally creak.

    The basic reason for the creaking is one of two reasons, either a poor fit or misalignment. Often, the two occur at

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  2. Case Study: Fixing a Trek Madone BB90 Bottom Bracket

    In this video, I take you through the engineering that I went through to fix a Trek Madone BB90 bottom bracket. You get to see some of the real engineering decisions involved in trying to get a fix at a reasonable cost. 

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