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

Insights

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

Design deviates from other sizes of Flyxii FE-02 Gravel

Very upright stack and reach vs trend of progressive gravel bikes

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

Stack	606mm	600mm -6mm
Reach	384mm	390mm +6mm
Stack to Reach Ratio	1.58:1	1.54:1
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	5.4deg	4.1deg -1.3deg
Head Tube Angle	72deg	71deg -1deg
Seat Tube Angle	72.5deg	72.9deg +0.4deg
Head Tube Length	190mm	177mm -13mm
Bottom Bracket Drop	67mm	67mm +0mm
Bottom Bracket Height	284mm	294mm +10mm
Chainstay Length	435mm	435mm +0mm
Chainstay Length Horizontal	429.8mm	429.8mm +0mm
Front-Center	615.4mm	635.7mm +20.3mm
Front-Center Horizontal	611.7mm	632.2mm +20.5mm
Wheelbase	1041.5mm	1062mm +20.5mm
Fork Offset/Rake	50mm	55mm +5mm
Fork Length, Unknown	395mm	405mm +10mm
Trail	61.5mm mid/neutral	66.1mm +4.6mm high
Mechanical Trail	58.5mm	62.5mm +4mm
Wheel Flop	18.1mm	20.4mm +2.3mm
Tire to Pedal Spindle	89.4mm 175 mm cranks	104.7mm +15.3mm 170 mm cranks
Pedal Spindle to Ground Clearance	109mm 175 mm cranks	124mm +15mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	40mm	50mm +10mm
Tire Width Max	—	57mm
Tire Outer Diameter	702mm	722mm +20mm
Bike Length with Tires	1743.5mm	1784mm +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