Compare: 2026 TanTan Cycling (Seraph) GR257 Base 560 vs 2020 Flyxii FE-02 Gravel Base 56

Insights

Very upright stack and reach vs trend of progressive gravel bikes

Design deviates from other sizes of TanTan Cycling (Seraph) GR257

Somewhat upright stack and reach vs trend of all-road/gravel bikes

Design deviates from other sizes of Flyxii FE-02 Gravel

Stack	580mm	589mm +9mm
Reach	383mm	380mm -3mm
Stack to Reach Ratio	1.51:1	1.55:1
Seat Tube Length, C-T	—	560mm
Seat Tube Length, C-TTT	546mm	—
Top Tube Length, Effective/Horizontal Center	558mm	—
Top Tube Length, Effective/Horizontal Unknown	—	560mm
Top Tube Slope	4deg	5.6deg +1.6deg
Head Tube Angle	71deg	72deg +1deg
Seat Tube Angle	73.3deg	73deg -0.3deg
Head Tube Length	153mm	170mm +17mm
Bottom Bracket Drop	69mm	67mm -2mm
Bottom Bracket Height	292mm	284mm -8mm
Chainstay Length	435mm	435mm +0mm
Chainstay Length Horizontal	429.5mm	429.8mm +0.3mm
Front-Center	621.4mm	605.9mm -15.5mm
Front-Center Horizontal	617.5mm	602.2mm -15.3mm
Wheelbase	1047mm	1032mm -15mm
Fork Offset/Rake	55mm	50mm -5mm
Fork Length, Unknown	405mm	395mm -10mm
Trail	66.1mm high	61.5mm -4.6mm mid/neutral
Mechanical Trail	62.5mm	58.5mm -4mm
Wheel Flop	20.4mm	18.1mm -2.3mm
Tire to Pedal Spindle	90.4mm 170 mm cranks	79.9mm -10.5mm 175 mm cranks
Pedal Spindle to Ground Clearance	122mm 170 mm cranks	109mm -13mm 175 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	50mm	40mm -10mm
Tire Width Max	57mm	—
Tire Outer Diameter	722mm	702mm -20mm
Bike Length with Tires	1769mm	1734mm -35mm
Crank Length	—	175mm
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