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· CEO Product Failure
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I have a CK headset on a TB4. I called got the part number. Backcountry ended up having inventory.
 

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Tallboy 4 uses a totally different headset from 5010 V2. Tallboy is IS41/IS52. 5010 V2 is ZS44/EC49.

If you can't find the Chris King Inset 3 I would buy a Wolftooth.

Wolftooth has upper ZS44:

And lower EC49:
 
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