Originally Posted by
hulagun
[...]
My tire is now noticeably off center to the RH or drive side (the fat shim is on the LH side). I think my buddy just slapped in a shim spacer and forgot about wheel alignment. I asked him about this and he insists he re-ordered a new 130mm hub from Surly and reinstalled it into my wheel. He says he still has the old 120mm hub....[...]
I think it is not much of a mechanical problem when spacing a 120mm to a 130mm axle...
The only issues are the alignment of the rim and the lenght of the axle, nothing else. So I actually think that Surly DO use the same parts for 120mm and 130mm hubs, apart from the axle. It just wouldn't pay off to construct two different shells for the missing 5mm on each side, considering that there is still some space needed to adjust the cainline for different setups.
Some early track-hubs are spaced 110mm. They got respaced to later 120 track-standard and used for international competitions without any concern or troubles... So I wouldn't worry too much and simply adjust the rim to the center, smash the spare hub on ebay and ride your fine fixie...
EDIT: I actually ride a very vintage 110mm trackhub spaced to 120mm on my track-racer... it works fine and 120 to 130 is not much difference.