2021 Specialized Bicycles Aethos Base

	49	52	54	56	58	61
Stack	514mm	527mm	544mm	565mm	591mm	612mm
Reach	375mm	380mm	384mm	395mm	402mm	408mm
Stack to Reach Ratio	1.37:1	1.39:1	1.42:1	1.43:1	1.47:1	1.5:1
Seat Tube Length, C-T	431mm	462mm	481mm	504mm	532mm	567mm
Top Tube Length, Effective/Horizontal Center	508mm	531mm	540mm	562mm	577mm	595mm
Top Tube Slope	11.3deg	9.3deg	9deg	8.6deg	8.3deg	6.9deg
Head Tube Angle	71.75deg	72.5deg	73deg	73.5deg	73.5deg	74deg
Seat Tube Angle	75.5deg	74deg	74deg	73.5deg	73.5deg	73deg
Head Tube Length	109mm	120mm	137mm	157mm	184mm	204mm
Bottom Bracket Drop	74mm	74mm	72mm	72mm	72mm	72mm
Bottom Bracket Height	263mm	263mm	265mm	265mm	265mm	265mm
Chainstay Length	410mm	410mm	410mm	410mm	410mm	410mm
Chainstay Length Horizontal	403.3mm	403.3mm	403.6mm	403.6mm	403.6mm	403.6mm
Front-Center	574mm	577mm	579mm	591mm	606mm	613mm
Front-Center Horizontal	569.7mm	571.7mm	574.4mm	587.4mm	601.4mm	608.4mm
Wheelbase	973mm	975mm	978mm	991mm	1005mm	1012mm
Fork Offset/Rake	47mm	47mm	44mm	44mm	44mm	44mm
Fork Length (Axle-To-Crown)	369mm	369mm	369mm	369mm	369mm	369mm
Trail	61.6mm mid/neutral	57mm mid/neutral	57mm mid/neutral	53.9mm mid/neutral	53.9mm mid/neutral	50.9mm mid/neutral
Mechanical Trail	58.5mm	54.3mm	54.5mm	51.7mm	51.7mm	48.9mm
Wheel Flop	18.3mm	16.3mm	15.9mm	14.7mm	14.7mm	13.5mm
Standover Height	705mm	728mm	748mm	769mm	796mm	824mm
Tire to Pedal Spindle	72mm 165 mm cranks	70mm 170 mm cranks	69.5mm 172.5 mm cranks	81.5mm 172.5 mm cranks	94mm 175 mm cranks	101mm 175 mm cranks
Pedal Spindle to Ground Clearance	98mm 165 mm cranks	93mm 170 mm cranks	92.5mm 172.5 mm cranks	92.5mm 172.5 mm cranks	90mm 175 mm cranks	90mm 175 mm cranks

	49	52	54	56	58	61
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
Tire Width	26mm	26mm	26mm	26mm	26mm	26mm
Tire Width Max	32mm	32mm	32mm	32mm	32mm	32mm
Tire Outer Diameter	674mm	674mm	674mm	674mm	674mm	674mm
Bike Length with Tires	1647mm	1649mm	1652mm	1665mm	1679mm	1686mm
Crank Length	165mm	170mm	172.5mm	172.5mm	175mm	175mm
Handlebar Width	380mm	400mm	420mm	420mm	440mm	440mm
Stem Length	80mm	90mm	100mm	100mm	110mm	110mm

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.specialized.com/us/en/s-works-aethos---dura-ace-di2/p/187062?color=299404-187062&searchText=97221-0149

Geometry