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what are these recesses for ?

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what are these recesses for ?

Old 09-14-13, 08:55 PM
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tomana
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what are these recesses for ?

I'm cleaning my first cassette assembly and noticed that the gears have two recesses in them. What's the purpose of these recesses?

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Old 09-14-13, 08:57 PM
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Recesses, weird tooth profiles, etc. are designed into the part to assist in shifting.
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Old 09-14-13, 09:09 PM
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Yes, they allow the chain to move sideways slightly as it begins the shift to the next sprocket.
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Old 09-14-13, 09:10 PM
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They're called 'shift ramps'. Eases the movement of the chain from one gear to the next.
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Old 09-14-13, 09:58 PM
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thank you ...
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