2023 Soma Fabrications Jawbone A-Type Base

	50cm	52cm	52	54cm	54	56	56cm	58cm	61cm	61cm	64cm
Stack	563mm	582mm	582mm	594mm	594mm	623mm	623mm	637mm	652mm	652mm	673mm
Reach	361mm	369mm	369mm	377mm	377mm	379mm	379mm	388mm	401mm	401mm	416mm
Stack to Reach Ratio	1.56:1	1.58:1	1.58:1	1.58:1	1.58:1	1.64:1	1.64:1	1.64:1	1.63:1	1.63:1	1.62:1
Seat Tube Length, C-T	420mm	450mm	450mm	515mm	515mm	525mm	525mm	545mm	580mm	580mm	625mm
Top Tube Length, Effective/Horizontal Center	—	—	539mm	—	553mm	569mm	—	—	—	—	—
Top Tube Length, Effective/Horizontal Unknown	—	—	—	—	—	—	—	—	—	600mm	—
Top Tube Length, Actual C-C	523mm	539mm	—	553mm	—	—	569mm	583mm	600mm	—	628mm
Top Tube Slope	18.5deg	16.9deg	16.9deg	10.8deg	10.8deg	12.8deg	12.8deg	12deg	9.7deg	9.7deg	7.3deg
Head Tube Angle	70deg	70.5deg	70.5deg	70.5deg	70.5deg	71deg	70.5deg	71deg	71.5deg	71.5deg	71.5deg
Seat Tube Angle	74deg	73.8deg	73.8deg	73.5deg	73.5deg	73deg	73deg	73deg	73deg	73deg	72.5deg
Head Tube Length	130mm	142mm	142mm	155mm	155mm	185mm	185mm	200mm	210mm	210mm	240mm
Bottom Bracket Drop	66mm	66mm	66mm	72mm	72mm	72mm	72mm	72mm	72mm	72mm	72mm
Bottom Bracket Height	281.9mm	281.9mm	292mm	294.9mm	286mm	286mm	294.9mm	294.9mm	294.9mm	294.9mm	294.9mm
Chainstay Length	445mm	445mm	445mm	445mm	445mm	445mm	445mm	445mm	445mm	445mm	445mm
Chainstay Length Horizontal	440.1mm	440.1mm	440.1mm	439.1mm	439.1mm	439.1mm	439.1mm	439.1mm	439.1mm	439.1mm	439.1mm
Front-Center	600mm	608mm	605.5mm	619mm	621.1mm	631mm	633mm	640mm	660mm	660mm	675mm
Front-Center Horizontal	595.9mm	601.9mm	601.9mm	616.9mm	616.9mm	626.9mm	626.9mm	634.9mm	648.9mm	648.9mm	672.9mm
Wheelbase	1036mm	1042mm	1042mm	1056mm	1056mm	1066mm	1066mm	1074mm	1088mm	1088mm	1112mm
Fork Offset/Rake	50mm	50mm	50mm	50mm	50mm	50mm	50mm	50mm	50mm	50mm	50mm
Fork Length (Axle-To-Crown)	420mm	420mm	—	420mm	—	—	420mm	420mm	420mm	420mm	420mm
Fork Length, Unknown	—	—	420mm	—	420mm	420mm	—	—	—	—	—
Trail	73.4mm high	70.2mm high	73.7mm high	76.9mm high	73.7mm high	70.4mm high	76.9mm high	73.5mm high	70mm high	70mm high	70mm high
Mechanical Trail	69mm	66.1mm	69.5mm	72.5mm	69.5mm	66.6mm	72.5mm	69.4mm	66.4mm	66.4mm	66.4mm
Wheel Flop	23.6mm	22.1mm	23.2mm	24.2mm	23.2mm	21.7mm	24.2mm	22.6mm	21.1mm	21.1mm	21.1mm
Standover Height	738mm	758mm	758mm	804mm	804mm	827mm	827mm	844mm	864mm	864mm	890mm
Tire to Pedal Spindle	82.1mm 170 mm cranks	90.1mm 170 mm cranks	77.5mm 170 mm cranks	82.1mm 170 mm cranks	93.1mm 170 mm cranks	103mm 170 mm cranks	96.1mm 170 mm cranks	103.1mm 170 mm cranks	123.1mm 170 mm cranks	123.1mm 170 mm cranks	138.1mm 170 mm cranks
Pedal Spindle to Ground Clearance	111.9mm 170 mm cranks	111.9mm 170 mm cranks	122mm 170 mm cranks	124.9mm 170 mm cranks	116mm 170 mm cranks	116mm 170 mm cranks	124.9mm 170 mm cranks	124.9mm 170 mm cranks	124.9mm 170 mm cranks	124.9mm 170 mm cranks	124.9mm 170 mm cranks

	50cm	52cm	52	54cm	54	56	56cm	58cm	61cm	61cm	64cm
Wheel Size	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	2.2in	2.2in	47mm	2.2in	47mm	47mm	2.2in	2.2in	2.2in	2.2in	2.2in
Tire Width Max	2.5in	2.5in	2.2in	2.3in	2.2in	2.2in	2.3in	2.3in	2.3in	—	2.3in
Tire Outer Diameter	695.8mm	695.8mm	716mm	733.8mm	716mm	716mm	733.8mm	733.8mm	733.8mm	733.8mm	733.8mm
Bike Length with Tires	1731.8mm	1737.8mm	1758mm	1789.8mm	1772mm	1782mm	1799.8mm	1807.8mm	1821.8mm	1821.8mm	1845.8mm

Very Upright

Somewhat Upright

Average

Somewhat Aggressive

Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Learn more about the Upright/Aggressive Scale

Category Trend

Off-road Touring

Source:https://www.somafab.com/archives/product/jawbone-frame-a-type

Suggest Bike Edit

2023 Soma Fabrications Jawbone A-Type Base

Geometry

Base Build

Stack and Reach vs. Category Trend