Compare: 2026 TanTan Cycling (Seraph) GR257 Base 480 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	520mm	542.6mm +22.6mm
Reach	363mm	374.1mm +11.1mm
Stack to Reach Ratio	1.43:1	1.45:1
Seat Tube Length, C-TTT	449mm	—
Seat Tube Length, Unknown	—	490mm
Top Tube Length, Effective/Horizontal Center	510mm	—
Top Tube Length, Effective/Horizontal Unknown	—	535mm
Top Tube Slope	8deg	8.1deg +0.1deg
Head Tube Angle	70deg	71deg +1deg
Seat Tube Angle	74.3deg	73.5deg -0.8deg
Head Tube Length	86mm	120mm +34mm
Bottom Bracket Drop	77mm	70mm -7mm
Bottom Bracket Height	284mm	281mm -3mm
Chainstay Length	435mm	430mm -5mm
Chainstay Length Horizontal	428.1mm	424.3mm -3.8mm
Front-Center	587.9mm	593.8mm +5.9mm
Front-Center Horizontal	582.9mm	584.6mm +1.7mm
Wheelbase	1011mm	1008.9mm -2.1mm
Fork Offset/Rake	55mm	50mm -5mm
Fork Length (On-Axis)	—	397mm
Fork Length, Unknown	405mm	—
Trail	72.9mm high	68mm -4.9mm high
Mechanical Trail	68.5mm	64.3mm -4.2mm
Wheel Flop	23.4mm	20.9mm -2.5mm
Tire to Pedal Spindle	56.9mm 170 mm cranks	72.8mm +15.9mm 170 mm cranks
Pedal Spindle to Ground Clearance	114mm 170 mm cranks	111mm -3mm 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	1733mm	1710.9mm -22.1mm
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