2020/v3 Bird Bikes Aeris AM9 170mm 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	64.7deg	64.7deg	64.7deg	64.7deg
Effective Seat Tube Angle, ETT HT Top	75.2deg	75.2deg	75.2deg	75.2deg
Head Tube Length	100mm	110mm	110mm	120mm
Bottom Bracket Drop	24mm	24mm	24mm	24mm
Bottom Bracket Height	350.5mm	350.5mm	350.5mm	350.5mm
Chainstay Length	440mm	440mm	440mm	440mm
Chainstay Length Horizontal	439.3mm	439.3mm	439.3mm	439.3mm
Front-Center	782.1mm	809.4mm	834.4mm	860.6mm
Front-Center Horizontal	781.8mm	809mm	834mm	860.3mm
Wheelbase	1221.1mm	1248.4mm	1273.4mm	1299.6mm
Fork Offset/Rake	46mm	46mm	46mm	46mm
Fork Length (Axle-To-Crown)	571mm	571mm	571mm	571mm
Trail	126.2mm very high	126.2mm very high	126.2mm very high	126.2mm very high
Mechanical Trail	114.1mm	114.1mm	114.1mm	114.1mm
Wheel Flop	48.7mm	48.7mm	48.7mm	48.7mm
Tire to Pedal Spindle	237.6mm 170 mm cranks	264.9mm 170 mm cranks	289.9mm 170 mm cranks	316.1mm 170 mm cranks
Pedal Spindle to Ground Clearance	180.5mm 170 mm cranks	180.5mm 170 mm cranks	180.5mm 170 mm cranks	180.5mm 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.

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

Geometry