2019 Specialized Bicycles Men's Sirrus Base

	S	M	L	XL	XXL
Stack	564mm	593mm	611mm	639mm	670mm
Reach	388mm	400mm	402mm	414mm	426mm
Stack to Reach Ratio	1.45:1	1.48:1	1.52:1	1.54:1	1.57:1
Seat Tube Length, C-T	415mm	455mm	495mm	535mm	565mm
Top Tube Length, Effective/Horizontal HT Top	555mm	576mm	583mm	604mm	631mm
Top Tube Slope	18.2deg	16.5deg	14.1deg	12.6deg	12.4deg
Head Tube Angle	70deg	71deg	71.5deg	72deg	72deg
Seat Tube Angle	73.5deg	73.5deg	73.5deg	73.5deg	73deg
Head Tube Length	153mm	179mm	196mm	223mm	256mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm	70mm
Bottom Bracket Height	273mm	273mm	273mm	273mm	273mm
Chainstay Length	440mm	440mm	440mm	440mm	440mm
Chainstay Length Horizontal	434.4mm	434.4mm	434.4mm	434.4mm	434.4mm
Front-Center	626mm	638mm	641mm	656mm	679mm
Front-Center Horizontal	622.6mm	634.6mm	637.6mm	652.6mm	674.6mm
Wheelbase	1057mm	1069mm	1072mm	1087mm	1109mm
Fork Offset/Rake	51mm	51mm	51mm	51mm	51mm
Fork Length (Axle-To-Crown)	390mm	390mm	390mm	390mm	390mm
Trail	70.6mm high	64.2mm mid/neutral	61mm mid/neutral	57.8mm mid/neutral	57.8mm mid/neutral
Mechanical Trail	66.3mm	60.7mm	57.8mm	55mm	55mm
Wheel Flop	22.7mm	19.8mm	18.4mm	17mm	17mm
Standover Height	735mm	775mm	805mm	845mm	875mm
Tire to Pedal Spindle	113mm 170 mm cranks	125mm 170 mm cranks	128mm 170 mm cranks	138mm 175 mm cranks	161mm 175 mm cranks
Pedal Spindle to Ground Clearance	103mm 170 mm cranks	103mm 170 mm cranks	103mm 170 mm cranks	98mm 175 mm cranks	98mm 175 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.specialized.com/us/en/mens-sirrus/p/154507?color=225887-154507

Geometry