Compare: 2020 Flyxii FE-02 Gravel Base 49 vs 2026 TanTan Cycling (Seraph) GR257 Base 510

Insights

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

Design deviates from other sizes of Flyxii FE-02 Gravel

Somewhat upright stack and reach vs trend of progressive gravel bikes

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

Stack	538mm	540mm +2mm
Reach	376mm	369mm -7mm
Stack to Reach Ratio	1.43:1	1.46:1
Seat Tube Length, C-T	490mm	—
Seat Tube Length, C-TTT	—	488mm
Top Tube Length, Effective/Horizontal Center	—	521mm
Top Tube Length, Effective/Horizontal Unknown	525mm	—
Top Tube Slope	7.4deg	5.7deg -1.7deg
Head Tube Angle	70.5deg	71deg +0.5deg
Seat Tube Angle	74.5deg	74.3deg -0.2deg
Head Tube Length	120mm	108mm -12mm
Bottom Bracket Drop	69mm	72mm +3mm
Bottom Bracket Height	282mm	289mm +7mm
Chainstay Length	435mm	435mm +0mm
Chainstay Length Horizontal	429.5mm	429mm -0.5mm
Front-Center	599.1mm	593.4mm -5.7mm
Front-Center Horizontal	595.1mm	589mm -6.1mm
Wheelbase	1024.6mm	1018mm -6.6mm
Fork Offset/Rake	50mm	55mm +5mm
Fork Length, Unknown	395mm	405mm +10mm
Trail	71.3mm high	66.1mm -5.2mm high
Mechanical Trail	67.2mm	62.5mm -4.7mm
Wheel Flop	22.4mm	20.4mm -2mm
Tire to Pedal Spindle	78.1mm 170 mm cranks	62.4mm -15.7mm 170 mm cranks
Pedal Spindle to Ground Clearance	112mm 170 mm cranks	119mm +7mm 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	1726.6mm	1740mm +13.4mm
Crank Length	170mm	—
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