Compare: 2026 TanTan Cycling (Seraph) GR257 Base 510 vs 2025 LightCarbon LCG071S-PRO Base 490

Insights

Somewhat upright stack and reach vs trend of progressive gravel bikes

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

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

Design deviates from other sizes of LightCarbon LCG071S-PRO

Stack	540mm	542.6mm +2.6mm
Reach	369mm	374.1mm +5.1mm
Stack to Reach Ratio	1.46:1	1.45:1
Seat Tube Length, C-TTT	488mm	—
Seat Tube Length, Unknown	—	490mm
Top Tube Length, Effective/Horizontal Center	521mm	—
Top Tube Length, Effective/Horizontal Unknown	—	535mm
Top Tube Slope	5.7deg	8.1deg +2.4deg
Head Tube Angle	71deg	71deg +0deg
Seat Tube Angle	74.3deg	73.5deg -0.8deg
Head Tube Length	108mm	120mm +12mm
Bottom Bracket Drop	72mm	70mm -2mm
Bottom Bracket Height	289mm	281mm -8mm
Chainstay Length	435mm	430mm -5mm
Chainstay Length Horizontal	429mm	424.3mm -4.7mm
Front-Center	593.4mm	593.8mm +0.4mm
Front-Center Horizontal	589mm	584.6mm -4.4mm
Wheelbase	1018mm	1008.9mm -9.1mm
Fork Offset/Rake	55mm	50mm -5mm
Fork Length (On-Axis)	—	397mm
Fork Length, Unknown	405mm	—
Trail	66.1mm high	68mm +1.9mm high
Mechanical Trail	62.5mm	64.3mm +1.8mm
Wheel Flop	20.4mm	20.9mm +0.5mm
Tire to Pedal Spindle	62.4mm 170 mm cranks	72.8mm +10.4mm 170 mm cranks
Pedal Spindle to Ground Clearance	119mm 170 mm cranks	111mm -8mm 170 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	53mm -4mm
Tire Outer Diameter	722mm	702mm -20mm
Bike Length with Tires	1740mm	1710.9mm -29.1mm
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