I am seriously thinking about purchasing a complete motobecane fantom cross uno. I have a question about hub sizing. It comes with a 120mm rear hub. Is this a common size. If I want to change to different wheels later, will this limit my choices?
Thanks in advance for answering these questions.

120 mm is the standard spacing for singlespeed and fixed gear frames. You'll have tons of choices.

i bought this bike and got a pair of velocity deep v wheels built up with velocity hubs

the deep v design is pretty strong, so thats why i chose those over the stock wheels...theyve been holding up well through a season of cross and lots of singletrack use

great bike

Thanks for the tip. I have been reading about the Velocity deep v wheels. Everyone seems to agree that they are the wheels to get. What other mods have you made to the Uno? It seems, that with some personalization, the frame set could be comparable to a Raleigh One way or a Surly Cross Check. Both frames are good , but really expensive to build up a bike on.