	XS	S	M	L	XL	2XL	3XL
Stack	535mm	534mm	553mm	564mm	583mm	602mm	625mm
Reach	366mm	376mm	376mm	378mm	382mm	391mm	393mm
Stack to Reach Ratio	1.46:1	1.42:1	1.47:1	1.49:1	1.53:1	1.54:1	1.59:1
Seat Tube Length, C-T	480mm	500mm	520mm	540mm	560mm	580mm	600mm
Top Tube Length, Effective/Horizontal HT Top	500mm	520mm	535mm	545mm	560mm	575mm	590mm
Top Tube Slope	8.3deg	5.9deg	5.8deg	5deg	5deg	4.8deg	5.3deg
Head Tube Angle	70deg	71deg	71.5deg	72deg	72deg	72deg	72deg
Seat Tube Angle	75deg	74.5deg	74deg	73.5deg	73deg	73deg	72.5deg
Head Tube Length	100mm	110mm	130mm	140mm	160mm	180mm	200mm
Bottom Bracket Drop	69mm	69mm	69mm	69mm	69mm	69mm	69mm
Bottom Bracket Height	274mm	274mm	274mm	274mm	274mm	274mm	274mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	419.4mm	419.4mm	419.4mm	419.4mm	419.4mm	419.4mm	419.4mm
Front-Center	592.9mm	593mm	594.7mm	595.4mm	605.5mm	620.6mm	630mm
Front-Center Horizontal	588.8mm	589mm	590.7mm	591.4mm	601.6mm	616.8mm	626.2mm
Wheelbase	1008.2mm	1008.4mm	1010mm	1010.8mm	1020.9mm	1036.1mm	1045.6mm
Fork Offset/Rake	50mm	50mm	50mm	50mm	50mm	50mm	50mm
Fork Length (Axle-To-Crown)	379mm	379mm	379mm	379mm	379mm	379mm	379mm
Trail	71.6mm high	65.2mm high	62mm mid/neutral	58.9mm mid/neutral	58.9mm mid/neutral	58.9mm mid/neutral	58.9mm mid/neutral
Mechanical Trail	67.3mm	61.7mm	58.8mm	56mm	56mm	56mm	56mm
Wheel Flop	23mm	20.1mm	18.7mm	17.3mm	17.3mm	17.3mm	17.3mm
Tire to Pedal Spindle	79.9mm 170 mm cranks	80mm 170 mm cranks	81.7mm 170 mm cranks	82.4mm 170 mm cranks	92.5mm 170 mm cranks	107.6mm 170 mm cranks	117mm 170 mm cranks
Pedal Spindle to Ground Clearance	104mm 170 mm cranks	104mm 170 mm cranks	104mm 170 mm cranks	104mm 170 mm cranks	104mm 170 mm cranks	104mm 170 mm cranks	104mm 170 mm cranks

	XS	S	M	L	XL	2XL	3XL
Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	32mm	32mm	32mm	32mm	32mm	32mm	32mm
Tire Width Max	40mm	40mm	40mm	40mm	40mm	40mm	40mm
Tire Outer Diameter	686mm	686mm	686mm	686mm	686mm	686mm	686mm
Bike Length with Tires	1694.2mm	1694.4mm	1696mm	1696.8mm	1706.9mm	1722.1mm	1731.6mm

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.

Learn more about the Upright/Aggressive Scale

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Source:alanbike.it

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2027 Alan Bike Alpha Allroad

Geometry

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