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PostPosted: Sat Nov 16, 2019 10:03 pm 
rBoTM Winner
rBoTM Winner

Joined: Fri Jul 12, 2013 7:04 pm
Posts: 836
I've done this all be it on a 600 ultegra hub. It takes about 30secs to file out part of the cog so it fits the free wheel the alloy is so soft.

the last cog is Dura ace specific though and can not be swapped with any other from 600 or 105.


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PostPosted: Fri Nov 22, 2019 10:26 am 
Newbie

Joined: Sat Nov 16, 2019 10:59 am
Posts: 1
This can work but you need to ensure that the 2nd smallest cog sits (just) fully on the freehub to ensure that it is a) sufficiently located and b) just proud enough to be compressed by the threaded cog to keep the assembly tight. The correct DA 2nd last cog is actually different from standard UG cogs to achieve this more easily but with careful alignment and shim spacers it is achievable in this way. Only cosmetic problem you have is the finish, as no HG cogs look the same colour as the old DA.


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