Hey, I’ve recently gotten into MTB and started learning the anatomy of a bike.
The rear hub makes a clicking noise when coasting but is silent when pedaling – this is caused by springs or ratchets in the hub either engaging with the rest of the system or going the opposite direction, causing the springs (ratchets) to click.
And here is what I cannot fully grasp: What makes the inside of the hub suddenly start going in the other direction when coasting?
Sorry if my description was somewhat vague but I did my best 😀
Thanks!
In: 23
>And here is what I cannot fully grasp: What makes the inside of the hub suddenly start going in the other direction when coasting?
There are actually two spinny bits on the hub: The wheel, and the sprocket. Inside the wheel is a ratchet and pawl mechanism. Whenever the sprocket tries to spin faster than the wheel, the pawls lock into the ratchet, transferring the torque from the sprocket into the wheel.
Whenever the wheel is rotating faster than the sprocket, the pawls slip along the ratchet, which makes the clicking sound. Nothing starts going in the opposite direction, it’s just one part travelling faster than the other.
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