2020/v3 Bird Bikes Aeris AM9 160mm 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	65.1deg	65.1deg	65.1deg	65.1deg
Effective Seat Tube Angle, ETT HT Top	75.6deg	75.6deg	75.6deg	75.6deg
Head Tube Length	100mm	110mm	110mm	120mm
Bottom Bracket Drop	27mm	27mm	27mm	27mm
Bottom Bracket Height	347.5mm	347.5mm	347.5mm	347.5mm
Chainstay Length	440mm	440mm	440mm	440mm
Chainstay Length Horizontal	439.2mm	439.2mm	439.2mm	439.2mm
Front-Center	775.7mm	802.8mm	827.8mm	854mm
Front-Center Horizontal	775.2mm	802.4mm	827.4mm	853.6mm
Wheelbase	1214.4mm	1241.5mm	1266.5mm	1292.7mm
Fork Offset/Rake	46mm	46mm	46mm	46mm
Fork Length (Axle-To-Crown)	571mm	571mm	571mm	571mm
Trail	123.1mm very high	123.1mm very high	123.1mm very high	123.1mm very high
Mechanical Trail	111.7mm	111.7mm	111.7mm	111.7mm
Wheel Flop	47mm	47mm	47mm	47mm
Tire to Pedal Spindle	231.2mm 170 mm cranks	258.3mm 170 mm cranks	283.3mm 170 mm cranks	309.5mm 170 mm cranks
Pedal Spindle to Ground Clearance	177.5mm 170 mm cranks	177.5mm 170 mm cranks	177.5mm 170 mm cranks	177.5mm 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