Old 07-27-12, 10:56 AM
  #18  
rccardr 
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Fitting an over-width hub into your dropouts causes the dropouts to splay out a bit, they are no longer parallel, and as a result the derailleur hanger is no longer parallel to the plane of the rear wheel. Consequently the RD itself ends up being non-parallel to the cassette cogs, and it will not move across the width of the cassette exactly right. This increases friction and wear since the chain has to bend laterally a bit in the small gap from leaving a cog to entering the top RD pulley. Shifting suffers, and it requires more frequent adjustment to keep it working.
In theory, yes.

In practice, not so much of an issue. None of the conversions I've done suffer from poor shifting or require more frequent adjustment...or really any adjustment at all over several thousands of miles. And I've done a buttload of them.
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