The Jawbone A-Type frame is the perfect platform to build drop bar mountain touring and bike packing rig. Tange Prestige heat-treated butted CrMo steel; butted CrMo rear end. Flat mount disc brake tabs on rear. Investment cast vertical dropout with replaceable stainless steel hanger. 12 x 142mm thru-axle. Front derailleur compatible (bottom pull). Headset for optional 1-1/8″ matching fork: SHIS: ZS44/28.6 | ZS44/30. If running a tapered steerer fork, get an EC44 lower cup. Rear rack and fender eyelets. Two sets of bottle cage bosses; one set of cargo cage bosses on downtube. 44mm headtube: Fits 1-1/8″ steerer tubes and tapered steerer tubes with a headset swap. 27.2mm post size/28.6mm frt. der. size/29.8mm seat collar, 73mm bottom bracket (English threads). Tire Width Range: 27.5 x 47mm to 2.5a? / 700c x 38mm to 29 x 2.25a?. For matching fork please considerAYC4022