It will work.....Ive run a SS mtn that way,and had plenty of fixies w/o brakes,one good sticky back tire gives plenty of traction to stop.Get a KT coaster brake hub with trim kit from bikepartsusa.com,it comes spaced at 111mm.....it will fit almost anything w/spacers added.My only bad experience with coaster brake was it was a little tough to modulate the brake...they are a little touchy when new,and a dead stop meant lifting rear of bike and flipping pedal back around.....no different than a fixed gear.They also dont engage instantly like a freewheel,there's about 1/4 to 1/2 turn of cranks till your pedaling again.Run about an 75-80" gear on a roadie and would prob be a decent combo.