Pre threaded bottom bracket shells

In , Ultra-torque was introduced on all double cranksets to replace square taper systems. The bottom bracket spindle is split into two halves, where each half is integrated onto a crank arm. In , Power-torque was introduced on the lower end models of Athena, Centaur and Veloce. Power-torque is a two-piece crankset with the full-length spindle integrated into the drive side crank spider. In , Campagnolo released Over-torque cranksets and bottom brackets as their answer to the 30mm diameter crank technology. Cups can be pressed into modern frames with BB30, PF30 shells, although Campagnolo also makes a threaded cup set for traditional threaded frames.
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Bottom Bracket Tapping, Threading, Chasing, and Facing | Park Tool

Most bottom bracket shells have an internal thread to accept bottom bracket bearing units from numerous manufacturers. If these threads are not in acceptable condition, they may need preparation. Threads may need realignment, or may have weld splatter from manufacturing that prevents the threading of the bearings. Shells may be out of round due to welding during manufacturing. Additionally, some bearing system benefit from having the faces of the shell square to improve bearing adjustment and bearing longevity. If the shell faces are deformed, and are not parallel to one another, the left and right bearing may not be concentric to one another.
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Independent Bottom Bracket Efficiency Study

Over the years, the bicycle industry has created numerous bottom bracket standards. Unfortunately, the industry has not been clear and consistent when creating terms and names for them, sometimes creating several names for the same bottom bracket standard. This article will review the many bottom bracket standards on bicycles. The bottom bracket is held inside the part of the frame called the bottom bracket shell. With use, the bearings will wear out and require replacement.
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What is it? Imagine a 68mm-wide PressFit 30 BB shell; now cut it in 47x1mm threads. The Spin Provides an oversize bottom bracket shell for compatibility with many crank axle variants, and generous real-estate for oversized frame tubes light, stiff, etc. The standard is designed to allow most metal frames with PF30 shells to be converted to T47 by cutting threads into the existing BB.
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