Old 07-26-12, 03:10 PM
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I agree that fitting a 130 hub in a 126 frame is not that big a deal. In fact, some "!26" frames were actually spaced 128mm during the transition period to 130mm spaced road frame standard, those made around 1990.

However, there are other less obvious aspects to consider. 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.

Fitting an over-width hub into a frame works a whole lot better on steel frames where it is possible to realign the dropouts to parallel, thus realigning the derailleur hanger too. This is not really an option on Al or CF frames with Al dropouts and hangers.

I've fit a dishless 142mm OLD rear wheel into a 135mm spacing, but realigned the derailleur hanger to maintain good indexed 9spd shifting. You really need the Park RD alignment tool that references a true rim to do this right.
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