	XS	SM	MED	LG
Stack	571mm	590mm	610mm	630mm
Reach	371mm	390mm	408mm	426mm
Stack to Reach Ratio	1.54:1	1.51:1	1.5:1	1.48:1
Seat Tube Length, C-T	420mm	460mm	500mm	530mm
Top Tube Length, Effective/Horizontal Center	540mm	565mm	595mm	625mm
Top Tube Slope	19deg	16deg	13.4deg	12deg
Head Tube Angle	69.5deg	69.5deg	70deg	70deg
Seat Tube Angle	73.5deg	73.5deg	73deg	73deg
Head Tube Length	145mm	165mm	185mm	205mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm
Bottom Bracket Height	275.3mm	275.3mm	275.3mm	275.3mm
Chainstay Length	440mm	440mm	440mm	440mm
Chainstay Length Horizontal	434.4mm	434.4mm	434.4mm	434.4mm
Front-Center	615mm	642mm	663mm	687mm
Front-Center Horizontal	611.6mm	636.6mm	658.6mm	683.6mm
Wheelbase	1046mm	1071mm	1093mm	1118mm
Fork Offset/Rake	49.9mm	48.9mm	50.8mm	50.5mm
Fork Length (Axle-To-Crown)	400mm	400mm	400mm	400mm
Trail	75.8mm high	76.9mm high	71.6mm high	71.9mm high
Mechanical Trail	71mm	72.1mm	67.3mm	67.6mm
Wheel Flop	24.9mm	25.2mm	23mm	23.1mm
Standover Height	681mm	690mm	701mm	709mm
Tire to Pedal Spindle	99.7mm 170 mm cranks	126.7mm 170 mm cranks	147.7mm 170 mm cranks	171.7mm 170 mm cranks
Pedal Spindle to Ground Clearance	105.3mm 170 mm cranks	105.3mm 170 mm cranks	105.3mm 170 mm cranks	105.3mm 170 mm cranks

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.

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2026 Soma Fabrications Alta Vista Base

Geometry