Compare: 2023 TanTan Cycling (Seraph) TT-X68 Base 58 vs 2025 Trek Bikes Madone SL6 Gen 8 XL

Insights

Somewhat aggressive stack and reach vs trend of endurance road bikes

Design deviates from other sizes of TanTan Cycling (Seraph) TT-X68

Somewhat upright stack and reach vs trend of performance road bikes

Design deviates from other sizes of Trek Bikes Madone

Stack	591mm	610mm +19mm
Reach	402mm	402mm +0mm
Stack to Reach Ratio	1.47:1	1.52:1
Seat Tube Length, Unknown	515mm	—
Seat Tube Length, Effective Unknown	—	609mm
Top Tube Length, Effective/Horizontal Center	577mm	—
Top Tube Length, Effective/Horizontal Unknown	—	584mm
Top Tube Slope	10.1deg	2.6deg -7.5deg
Head Tube Angle	73.5deg	73.9deg +0.4deg
Seat Tube Angle	73.5deg	73.4deg -0.1deg
Head Tube Length	184mm	201mm +17mm
Bottom Bracket Drop	72mm	68mm -4mm
Bottom Bracket Height	271mm	271mm +0mm
Chainstay Length	410mm	412mm +2mm
Chainstay Length Horizontal	403.6mm	406.4mm +2.8mm
Front-Center	606mm	271mm -335mm
Front-Center Horizontal	601.4mm	600.7mm -0.7mm
Wheelbase	1005mm	1007mm +2mm
Fork Offset/Rake	44mm	40mm -4mm
Fork Length (Axle-To-Crown)	370mm	—
Trail	55.7mm mid/neutral	56.2mm +0.5mm mid/neutral
Mechanical Trail	53.4mm	54mm +0.6mm
Wheel Flop	15.2mm	15mm -0.2mm
Standover Height	807mm	863mm +56mm
Tire to Pedal Spindle	88mm 175 mm cranks	-243mm -331mm 175 mm cranks
Pedal Spindle to Ground Clearance	96mm 175 mm cranks	96mm +0mm 175 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	32mm	28mm -4mm
Tire Width Max	32mm	32mm +0mm
Tire Outer Diameter	686mm	678mm -8mm
Bike Length with Tires	1691mm	1685mm -6mm
Crank Length	175mm	175mm +0mm
Stem Length	—	110mm
Stem Angle	—	-7deg
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