Browsing Bikes, Frames & Frame Parts from Soma

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Frames
Soma Jawbone Frame B-Type
Margin Booster
  • 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
  
item # model size seat tube (c-t) top tube (effective, c-c) chainstay head angle seat angle bottom bracket seatpost front derail wheel size dropout color in stock?
  SF4020    Oversized item:
expedited shipping
not available.
Incurs a shipping
surcharge of $15.00
per unit.   		Jawbone B-Type 52cm 450mm 539mm 435-455mm 70.5 deg 73.8 deg 73mm 27.2mm 28.6mm 27.5" 10x135mm QR black YES
  SF4021    Oversized item:
expedited shipping
not available.
Incurs a shipping
surcharge of $15.00
per unit.   		Jawbone B-Type 54cm 490mm 553mm 435-455mm 70.5 deg 73.5 deg 73mm 27.2mm 28.6mm 29" 10x135mm QR black NO
  SF4022    Oversized item:
expedited shipping
not available.
Incurs a shipping
surcharge of $15.00
per unit.   		Jawbone B-Type 56cm 525mm 569mm 435-455mm 70.5 deg 73 deg 73mm 27.2mm 28.6mm 29" 10x135mm QR black YES
  SF4023    Oversized item:
expedited shipping
not available.
Incurs a shipping
surcharge of $15.00
per unit.   		Jawbone B-Type 58cm 545mm 583mm 435-455mm 71 deg 73 deg 73mm 27.2mm 28.6mm 29" 10x135mm QR black YES
  SF4024    Oversized item:
expedited shipping
not available.
Incurs a shipping
surcharge of $15.00
per unit.   		Jawbone B-Type 61cm 580mm 600mm 435-455mm 71.5 deg 73 deg 73mm 27.2mm 28.6mm 29" 10x135mm QR black YES
Frame Hangers & Parts