Ketten- und Ritzelverschleiß: Unterschied zwischen den Versionen

The image below shows a new chain on a worn sprocket with tall teeth. At the blue arrow in the image, you can see how the teeth are hooked. Bad things happen!

The new, unworn chain links fit the bottom of the gaps between sprocket teeth. Chain tension from pedaling pulls the links so the rollers are trapped behind the hooked teeth. As each roller comes around to the top of the sprocket, the hook pulls it downward (red arrow), then chain tension overcomes this pull. The roller breaks loose, rolling up the back of the hook, so the hook yanks the chain backward slightly with relation to the sprocket. Then the roller pops off and the chain jumps slightly forward. This happens for every roller which comes around, dozens of times per second. The resulting roughness can be felt through the pedals. The roughness is worse than with teeth which are only sloped.