Soma Jawbone B-Type Frame 64cm 29" - Black

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Product details

Management number	201675652	Release Date	2025/09/29	List Price	$384.98	Model Number	201675652
Category	Parts Frames E-Bike

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 inch 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 inch 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

TECH SPECS

Model	Jawbone B-Type
Size	64cm
Seat Tube (C-T)	625mm
Top Tube (Effective, C-C)	628mm
Chainstay	435-455mm
Head Angle	71.5 Deg
Seat Angle	72.5 Deg
Bottom Bracket	72mm
Seatpost	27.2mm
Front Derail	28.6mm
Wheel Size	29"
Dropout	10x135mm QR
Color	Black