4130 Triple butted heat treated chromoly frame and fork Disc and Canti brake compatible with Removable cantilever brake mounts Custom machined dropout with integrated tensioners 27mm ovalized chainstays w/ 2.1 (52c) clearance 5.6 lb weight (50cm) Designed for 38T x 48T or less rings (MTN crank) 27.2mm seatpost; 1 1/8" Threadless headset 132.5mm spacing for road or Mtn hubs 68mm bottom bracket shell