Compare: 2026 XDS X-LAB RT9 Base S vs 2025 SL8 Specialized Bicycles Tarmac sl8 Pro 170mm

Insights

Average stack and reach vs trend of performance road bikes

Design deviates from other sizes of XDS X-LAB RT9

Average stack and reach vs trend of performance road bikes

Design deviates from other sizes of Specialized Bicycles Tarmac sl8

Stack	525mm	527mm +2mm
Reach	372mm	380mm +8mm
Stack to Reach Ratio	1.41:1	1.39:1
Seat Tube Length, C-T	460mm	—
Seat Tube Length, Unknown	—	456mm
Top Tube Length, Effective/Horizontal Center	—	531mm
Top Tube Length, Effective/Horizontal Unknown	520mm	—
Top Tube Slope	9.4deg	9.9deg +0.5deg
Head Tube Angle	71.7deg	72.5deg +0.8deg
Seat Tube Angle	74.2deg	74deg -0.2deg
Head Tube Length	120mm	120mm +0mm
Bottom Bracket Drop	74mm	74mm +0mm
Bottom Bracket Height	265mm	263mm -2mm
Chainstay Length	410mm	410mm +0mm
Chainstay Length Horizontal	403.3mm	403.3mm +0mm
Front-Center	578mm	577mm -1mm
Front-Center Horizontal	573.7mm	571.7mm -2mm
Wheelbase	977mm	975mm -2mm
Fork Offset/Rake	49.9mm	46.6mm -3.3mm
Fork Length, Unknown	—	370mm
Trail	59.5mm mid/neutral	57.4mm -2.1mm mid/neutral
Mechanical Trail	56.5mm	54.7mm -1.8mm
Wheel Flop	17.8mm	16.5mm -1.3mm
Standover Height	728mm	746mm +18mm
Tire to Pedal Spindle	69mm 170 mm cranks	70mm +1mm 170 mm cranks
Pedal Spindle to Ground Clearance	95mm 170 mm cranks	93mm -2mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	28mm	26mm -2mm
Tire Outer Diameter	678mm	674mm -4mm
Bike Length with Tires	1655mm	1649mm -6mm
Handlebar Width	—	400mm
Stem Length	—	90mm
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Drop Bar
Frame Material	Carbon/Composite	Carbon/Composite
Fork Material	Carbon/Composite	Carbon/Composite
Brake Type	Disc	Disc