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Technical help needed

Can anyone explain to me why a Shimano WH-R600-R Complete Freehub Body is not compatible with my 105 HG 10 speed cassette? 

The first 1cm of the Shimano WH-R600 hub is compatible, and then the ridges stop the full engagement of the cassette.    

Is there a completely different HG system for Ultegra hubs?  

Help apprecaiated? 

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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