2020 Bird Bikes Aeris 145LT / AM160 Base

	S	M	ML	L	XL
Stack	589mm	589mm	599mm	599mm	608mm
Reach	433mm	458mm	481mm	506mm	528mm
Stack to Reach Ratio	1.36:1	1.29:1	1.25:1	1.18:1	1.15:1
Seat Tube Length, Unknown	380mm	410mm	440mm	470mm	500mm
Top Tube Length, Effective/Horizontal HT Top	580mm	605mm	630mm	655mm	680mm
Top Tube Slope	22.7deg	18.9deg	16.3deg	13deg	10.8deg
Head Tube Angle	64.3deg	64.3deg	64.3deg	64.3deg	64.3deg
Seat Tube Angle	75deg	75deg	75deg	75deg	75deg
Head Tube Length	110mm	110mm	120mm	120mm	130mm
Bottom Bracket Drop	12mm	12mm	12mm	12mm	12mm
Bottom Bracket Height	343.5mm	343.5mm	343.5mm	343.5mm	343.5mm
Chainstay Length	435mm	435mm	435mm	435mm	435mm
Chainstay Length Horizontal	434.8mm	434.8mm	434.8mm	434.8mm	434.8mm
Front-Center	743.3mm	768.3mm	795.3mm	820.3mm	847.3mm
Front-Center Horizontal	743.2mm	768.2mm	795.2mm	820.2mm	847.2mm
Wheelbase	1178mm	1203mm	1230mm	1255mm	1282mm
Fork Offset/Rake	29.3mm	29.3mm	28.5mm	28.5mm	29.1mm
Fork Length (Axle-To-Crown)	542mm	542mm	542mm	542mm	542mm
Trail	138.6mm very high	138.6mm very high	139.4mm very high	139.4mm very high	138.8mm very high
Mechanical Trail	124.9mm	124.9mm	125.6mm	125.6mm	125mm
Wheel Flop	54.2mm	54.2mm	54.5mm	54.5mm	54.2mm
Standover Height	699mm	699mm	700mm	700mm	704mm
Tire to Pedal Spindle	217.8mm 170 mm cranks	242.8mm 170 mm cranks	269.8mm 170 mm cranks	294.8mm 170 mm cranks	321.8mm 170 mm cranks
Pedal Spindle to Ground Clearance	173.5mm 170 mm cranks	173.5mm 170 mm cranks	173.5mm 170 mm cranks	173.5mm 170 mm cranks	173.5mm 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/2019/05/Aeris-AM160-2020-Technical-Data-Sheet.svg

Geometry