Soma Jawbone Frame B-Type Adventure - Black - 58cm

The Jawbone B-Type frame is a versatile platform to build drop bar mountain touring and bike packing rig. While it is still game for riding your favorite trail loop it is in its element when loaded up. The B-Type version is for the rider who may still prefer the familiarity of 100/135mm QR hubs, but appreciates extra features like sliding dropouts and tons of mounting bosses.

- Tange Prestige heat-treated double butted CrMo steel; butted CrMo rear end
- IRD 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 seperately)
- IS mount disc brake tabs
- Front derailleur compatible (bottom pull)
- Rear rack and fender eyelets
- Two sets of bottle cage bosses; one set of cargo cage bosses on downtube
- 44mm headtube fit 1 1/8 inch steerer tubes and tapered steerer tubes with a headset swap
- 27.2mm post size / 28.6mm front derailleur size / 29.8mm seat collar / 73mm bottom bracket (English threads)
- Tyre width range: 650b x 47mm to 27.5 x 2.6 inch / 700c x 38mm to 29 x 2.25 inch

Geometry:
- Size (Virtual): 58
- Seat Tube (C-T): 545mm
- Top Tube, Effective (C-C): 583mm
- Head Tube Angle: 71 degrees
- Seat Tube Angle: 73 degrees
- Chainstay Length: 435-455mm
- Headtube Length: 200mm
- Bottom Bracket Drop: 72mm
- Standover Height: 844mm
- Front Center: 640mm
- Wheelbase: 1074mm
- Frame Stack: 637mm
- Frame Reach: 388mm
- Fork Rake: 50mm
- MTB Tyre Fit: 29 Inch
- NOTE: Standover is based on a 650b x 2.2 or 29 x 2.2 inch tyre. Fork axle to crown: 420mm