Compare: 2026 XDS X-LAB RT9 Base XS vs 2025 SL8 Specialized Bicycles Tarmac sl8 Pro 165mm

Insights

Somewhat upright 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	510mm	501mm -9mm
Reach	362mm	366mm +4mm
Stack to Reach Ratio	1.41:1	1.37:1
Seat Tube Length, C-T	430mm	—
Seat Tube Length, Unknown	—	433mm
Top Tube Length, Effective/Horizontal Center	—	496mm
Top Tube Length, Effective/Horizontal Unknown	498mm	—
Top Tube Slope	11.3deg	9.8deg -1.5deg
Head Tube Angle	70.5deg	70.5deg +0deg
Seat Tube Angle	75deg	75.5deg +0.5deg
Head Tube Length	110mm	99mm -11mm
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	574mm	572mm -2mm
Front-Center Horizontal	569.2mm	566.7mm -2.5mm
Wheelbase	972.5mm	970mm -2.5mm
Fork Offset/Rake	49.8mm	46.7mm -3.1mm
Fork Length, Unknown	—	370mm
Trail	67.2mm high	69.8mm +2.6mm high
Mechanical Trail	63.4mm	65.8mm +2.4mm
Wheel Flop	21.2mm	22mm +0.8mm
Standover Height	704mm	723mm +19mm
Tire to Pedal Spindle	65mm 170 mm cranks	65mm +0mm 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	1650.5mm	1644mm -6.5mm
Handlebar Width	—	380mm
Stem Length	—	75mm
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