Oh, sorry - I see it is a track frame, which will be 120mm spaced. In that case, a track hub is your best bet - or a 126mm road hub.
Have you thought about brakes? Your track frame will almost certainly be built for 700c or 27" wheels - if you fit 26" wheels then AFAIK there are no brakes in production that have enough drop to fit. You'll (almost certainly) be able to go from 700c to 650b, though, but that has its own problems (namely, supply of rims and tyres).
Oh, sorry - I see it is a track frame, which will be 120mm spaced. In that case, a track hub is your best bet - or a 126mm road hub.
Have you thought about brakes? Your track frame will almost certainly be built for 700c or 27" wheels - if you fit 26" wheels then AFAIK there are no brakes in production that have enough drop to fit. You'll (almost certainly) be able to go from 700c to 650b, though, but that has its own problems (namely, supply of rims and tyres).