MDS Dropouts are compatible with Karate Monkey Ops, Krampus Ops, Instigator 2.0, and Ice Cream Truck frames.3 versions available:Vertical: 10mm QR Geared - QBP Part# FS2005Bolt Thru: 142 x 12 thru axle (Shimano Direct Mount derailleur hanger)- QBP # FS2007Horizontal: Singlespeed - QBP #FS2006