2020/v3 Bird Bikes Aeris AM9 150mm Fork unsagged

	Medium	Medium Long	Large	Extra Large
Stack	614mm	623mm	623mm	632mm
Reach	452mm	475mm	500mm	522mm
Stack to Reach Ratio	1.36:1	1.31:1	1.25:1	1.21:1
Seat Tube Length, C-T	395mm	420mm	445mm	470mm
Top Tube Length, Effective/Horizontal HT Top	605mm	630mm	655mm	680mm
Head Tube Angle	65.5deg	65.5deg	65.5deg	65.5deg
Effective Seat Tube Angle, ETT HT Top	76deg	76deg	76deg	76deg
Head Tube Length	100mm	110mm	110mm	120mm
Bottom Bracket Drop	30mm	30mm	30mm	30mm
Bottom Bracket Height	344.5mm	344.5mm	344.5mm	344.5mm
Chainstay Length	440mm	440mm	440mm	440mm
Chainstay Length Horizontal	439mm	439mm	439mm	439mm
Front-Center	769.3mm	796.4mm	821.4mm	847.4mm
Front-Center Horizontal	768.7mm	795.8mm	820.8mm	846.9mm
Wheelbase	1207.7mm	1234.8mm	1259.8mm	1285.9mm
Fork Offset/Rake	46mm	46mm	46mm	46mm
Fork Length (Axle-To-Crown)	561mm	561mm	561mm	561mm
Trail	120.1mm very high	120.1mm very high	120.1mm very high	120.1mm very high
Mechanical Trail	109.3mm	109.3mm	109.3mm	109.3mm
Wheel Flop	45.3mm	45.3mm	45.3mm	45.3mm
Tire to Pedal Spindle	224.8mm 170 mm cranks	251.9mm 170 mm cranks	276.9mm 170 mm cranks	302.9mm 170 mm cranks
Pedal Spindle to Ground Clearance	174.5mm 170 mm cranks	174.5mm 170 mm cranks	174.5mm 170 mm cranks	174.5mm 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.

Category Trend

Source:https://www.bird.bike/wp-content/uploads/2020/08/Aeris-AM9-V3-Technical-Data-Sheet.pdf

Geometry