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Remove The Cranks See how to remove the crank s from the cup and cone bottom bracket here.
Thread English 15 French 1 Italian 2 Swiss 1.
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Others are fit-and-forget, when they wear out the whole unit must be replaced.
An eccentric is a cylindrical plug or bearing cup that fits into an enlarged bottom bracket shell.
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See how to remove the crank s from the cup and cone bottom bracket here.
Once the lock-ring as moved back the cup can move.
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External bearings allow for a large diameter hence stiff and hollow hence light spindle.
This system is not without its issues, with shells becoming oversized due to wear a relatively common problem leading Trek to release the very slightly oversized V2 bearings to compensate.
With the development of external bearing designs, the standard shell diameter has become a considerable constraint, limiting both the diameter of the bottom bracket spindle and the size of the actual bearing balls in the races.