Soma Jawbone Frame B-Type

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 it is its element when loaded up. The B-Type version is for rider who may still prefer the familiarity of 100/135mm QR hubs, but appreciates extra features like sliding dropouts and a tons of mounting bosses.

- 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 considerSF4030