The Jawbone B-Type frame is the perfect platform to build your dream drop bar mountain touring and bike packing rig. While it is still game for riding gravel and singletrack, it is in its element when packed up for your next adventure.Tange Prestige heat-treated butted CrMo steel; butted CrMo rear endIRD Broski Sliding Dropouts allows for running derailleurs as well as geared hubs like Rohloff. You can also convert it to single speed if your derailleur conks out on a ride. (Stock dropout insert is for 135mm QR. 142 x 12mm Thru-Axle inserts available separately)IS disc brake mounts on rearFront derailleur compatible (bottom pull)Rear rack and fender eyeletsTwo sets of bottle cage bosses; one set of cargo cage bosses on downtube44mm headtube: Fits 1-1/8" steerer tubes and tapered steerer tubes with a headset swap27.2mm post size/28.6mm frt. der. size/29.8mm seat collar, 73mm bottom bracket (English threads)Tire Width Range: 27.5 x 47mm to 2.6” / 700c x 38mm to 29 x 2.25”Sizes: 650b only: 50cm, 52cm. 700c: 54cm, 56cm, 58cm, 61cm, 64cmSPECIFICATIONS AND RECOMMENDATIONSFRAMEHeadset for optional 1-1/8" matching fork: SHIS: ZS44/28.6 | ZS44/30). If running a tapered steerer fork, get an EC44 lower cupFront derailleur: 28.6mm ID, bottom pullSeatpost: 27.2mmSeat collar: 29.8 or 30.0mm (not included)Rear hub spacing: 135mmBrakes: Disc (IS mount 160mm rotor)Bottom bracket shell: 73mm wide, English threadsMax.Tire Clearance: 29 x 2.25 and 27.5(650b) x 2.5". On size 50cm and 52cm, we recommend not using tires more than 27.5 x 2.2 to reduce toe overlap issuesChainring clearance: Mountain 1x and 2xGuides for full length cable housingWater bottle bosses: On seat tube and under down tubeCargo cage Bosses (Three-pack mounts): One set on down tube.Rack and Fender mounts: Two at dropoutMax. weight with rider and load: 270 lbs/122 kg.Acceptable fork lengths: 417-425mmAcceptable fork rake: 44mm - 50mmFORKAxle to crown: 420mmRake: 50mmSteerer length: 300mmHub compatibility: 100mm QRFour sets of three-pack mounts at 45 degree angles.Inside/outside leg pannier rack bossRack and Fender mounts: Two at fork end
