whats up man. it is indeed a BLK MRKT Mob also. I love this bike, but I'm currently rockin a Trek Ticket hardtail in small - fits me much better than the Mob. That was a 34T MRP guide ring, but I would prefer a 32T to help clear the stay. i had to put a spacer in the BB to move the ring outboard a few mm. No wonder microdrive exists, which i am using on my Trek (running a profile crank with 25T ring and 12T cog in back). The threaded type single hub should line up the chainline ok, just play with the chainring position w/ spacers, but it's just not as adjustable as putting in spacers on a rear freewheel yknow. I do like the finished clean look of a single threaded style rear BMX hub though. Makes it super clean.