Compare: 2026 TanTan Cycling (Seraph) GR257 Base 580 vs 2020 Flyxii FE-02 Gravel Base 58

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	600mm	606mm +6mm
Reach	390mm	384mm -6mm
Stack to Reach Ratio	1.54:1	1.58:1
Seat Tube Length, C-T	—	580mm
Seat Tube Length, C-TTT	566mm	—
Top Tube Length, Effective/Horizontal Center	575mm	—
Top Tube Length, Effective/Horizontal Unknown	—	575mm
Top Tube Slope	4.1deg	5.4deg +1.3deg
Head Tube Angle	71deg	72deg +1deg
Seat Tube Angle	72.9deg	72.5deg -0.4deg
Head Tube Length	177mm	190mm +13mm
Bottom Bracket Drop	67mm	67mm +0mm
Bottom Bracket Height	294mm	284mm -10mm
Chainstay Length	435mm	435mm +0mm
Chainstay Length Horizontal	429.8mm	429.8mm +0mm
Front-Center	635.7mm	615.4mm -20.3mm
Front-Center Horizontal	632.2mm	611.7mm -20.5mm
Wheelbase	1062mm	1041.5mm -20.5mm
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	104.7mm 170 mm cranks	89.4mm -15.3mm 175 mm cranks
Pedal Spindle to Ground Clearance	124mm 170 mm cranks	109mm -15mm 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	1784mm	1743.5mm -40.5mm
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