Compare: 2026 XDS X-LAB RT9 Base L vs 2025 SL8 Specialized Bicycles Tarmac sl8 Pro 172.5mm

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	567mm	565mm -2mm
Reach	396mm	395mm -1mm
Stack to Reach Ratio	1.43:1	1.43:1
Seat Tube Length, C-T	500mm	—
Seat Tube Length, Unknown	—	494mm
Top Tube Length, Effective/Horizontal Center	—	563mm
Top Tube Length, Effective/Horizontal Unknown	563mm	—
Top Tube Slope	9.3deg	9.7deg +0.4deg
Head Tube Angle	73.5deg	73.5deg +0deg
Seat Tube Angle	73.5deg	73.5deg +0deg
Head Tube Length	157mm	157mm +0mm
Bottom Bracket Drop	72mm	72mm +0mm
Bottom Bracket Height	267mm	265mm -2mm
Chainstay Length	410mm	410mm +0mm
Chainstay Length Horizontal	403.6mm	403.6mm +0mm
Front-Center	592mm	592mm +0mm
Front-Center Horizontal	588.4mm	587.4mm -1mm
Wheelbase	992mm	991mm -1mm
Fork Offset/Rake	43.9mm	44.4mm +0.5mm
Fork Length, Unknown	—	370mm
Trail	54.7mm mid/neutral	53.5mm -1.2mm mid/neutral
Mechanical Trail	52.4mm	51.3mm -1.1mm
Wheel Flop	14.9mm	14.6mm -0.3mm
Standover Height	769mm	786mm +17mm
Tire to Pedal Spindle	83mm 170 mm cranks	85mm +2mm 170 mm cranks
Pedal Spindle to Ground Clearance	97mm 170 mm cranks	95mm -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	1670mm	1665mm -5mm
Handlebar Width	—	420mm
Stem Length	—	100mm
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