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Shimano 105 5800 rear derailleur vs Ultegra R8000 Shadow.


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Thank You for the helpful information that you provide on the Sick Biker Channel.

My current Bike is a Kona Dewey 2017 and would like to know of which derailleurs are suitable? It comes with entry level small cage Altus, I do not know what derailleurs can be fitted the 9 speed Altus has longer cage?, 

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Do you only want to upgrade the rear derailleur? Here's the compatibility chart of 9 speed and 8 speed MTB derailleurs. Yours is 8 speed.



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