Compare: 2022 TanTan Cycling (Seraph) GR047 Base M vs 2026 TanTan Cycling (Seraph) GR257 Base 540

Insights

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

Design deviates from other sizes of TanTan Cycling (Seraph) GR047

Somewhat upright stack and reach vs trend of progressive gravel bikes

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

Stack	582mm	560mm -22mm
Reach	382mm	376mm -6mm
Stack to Reach Ratio	1.52:1	1.49:1
Seat Tube Length, C-T	460mm	—
Seat Tube Length, C-TTT	—	524mm
Top Tube Length, Effective/Horizontal Center	—	540mm
Top Tube Length, Effective/Horizontal HT Top	552mm	—
Top Tube Slope	—	4.1deg
Head Tube Angle	71deg	71deg +0deg
Seat Tube Angle	—	73.7deg
Effective Seat Tube Angle, ETT Center	73.1deg	—
Head Tube Length	150mm	132mm -18mm
Bottom Bracket Drop	76mm	69mm -7mm
Bottom Bracket Height	273mm	292mm +19mm
Chainstay Length	430mm	435mm +5mm
Chainstay Length Horizontal	423.2mm	429.5mm +6.3mm
Front-Center	614mm	607.4mm -6.6mm
Front-Center Horizontal	609.3mm	603.5mm -5.8mm
Wheelbase	1032.5mm	1033mm +0.5mm
Fork Offset/Rake	50mm	55mm +5mm
Fork Length, Unknown	—	405mm
Trail	67.3mm high	66.1mm -1.2mm high
Mechanical Trail	63.6mm	62.5mm -1.1mm
Wheel Flop	20.7mm	20.4mm -0.3mm
Tire to Pedal Spindle	95mm 170 mm cranks	76.4mm -18.6mm 170 mm cranks
Pedal Spindle to Ground Clearance	103mm 170 mm cranks	122mm +19mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	38mm	50mm +12mm
Tire Width Max	—	57mm
Tire Outer Diameter	698mm	722mm +24mm
Bike Length with Tires	1730.5mm	1755mm +24.5mm
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