The hub is stock Bianchi, looks very similar to the Formula hubs. The shoulders are the same depth on both sides of the hub. The Soma cog gave a perfect 42mm chainline on the fixed side, but the Shimano SF-MX30 works horribly on the freewheel side (and sorry, it's the seatstay it's fouling, not the chainstay). The freewheel body is over 16mm wide - are the Whites or 1/8" Shimano SF-1200 hubs any narrower?