Soma Jawbone B-Type Frame, 58cm, 29″ – Black

– The Jawbone B-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
– IRD Broski Sliding Dropouts allows for running derailleurs as well as geared hubs like Rohloff (Stock dropout insert is for 135mm QR. 142 x 12mm Thru-Axle inserts available separately, SF4958, SF4959. SF4960-142x12mm axle )
– IS mount disc brake tabs
– 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 2.6” / 700c x 38mm to 29 x 2.25”
– For matching fork please consider SF4030

Model: Jawbone B-Type
Size: 58cm
Seat Tube (C-T): 545mm
Top Tube (Effective, C-C): 583mm
Chainstay: 435-455mm
Head Angle: 71 Deg
Seat Angle: 73 Deg
Bottom Bracket: 73mm
Seatpost: 27.2mm
Front Derail: 28.6mm