Tuesday, July 14, 2009

inside of wtb hub

Ever wander what's inside a hub? Those little arms are called the pawls. This is a 6 pawl system.

There is a plate called a cam plate that sits on the bottom and there is a stiff wire on the back of the cassette body. The tip of this wire dragging across the cam plate is what creates the ticking sound of a spinning freebody.

When it turns the other way, ie when you are pedaling, the stiff wire engages with holes in the cam plate which rotates. When the cam plate rotates it engages the pawls. The pawls rotate in which engages them onto the teeth of the cassette body

When I busted up my hub recently, here is what the cam plate looks like:


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