The halo supa drive rear hub has 120 teeth triple wedge pawl mechanism provides positive and secure drive a freewheel that sounds like no other micro notch engagement gaps for that perfect pedal pick up the supadrive rear hub went through rigorous testing for 9 months before its release and is still going strong in the market today despite it39s featherweight mass halo supa drive rear hub features cnc alloy shell is disc compatible alloy cassette carrier shimano hg compatible