Compare: 2025 LightCarbon LCG071S-PRO Base 490 vs 2026 TanTan Cycling (Seraph) GR257 Base 480

Insights

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

Design deviates from other sizes of LightCarbon LCG071S-PRO

Somewhat upright stack and reach vs trend of progressive gravel bikes

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

Stack	542.6mm	520mm -22.6mm
Reach	374.1mm	363mm -11.1mm
Stack to Reach Ratio	1.45:1	1.43:1
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	8.1deg	8deg -0.1deg
Head Tube Angle	71deg	70deg -1deg
Seat Tube Angle	73.5deg	74.3deg +0.8deg
Head Tube Length	120mm	86mm -34mm
Bottom Bracket Drop	70mm	77mm +7mm
Bottom Bracket Height	281mm	284mm +3mm
Chainstay Length	430mm	435mm +5mm
Chainstay Length Horizontal	424.3mm	428.1mm +3.8mm
Front-Center	593.8mm	587.9mm -5.9mm
Front-Center Horizontal	584.6mm	582.9mm -1.7mm
Wheelbase	1008.9mm	1011mm +2.1mm
Fork Offset/Rake	50mm	55mm +5mm
Fork Length (On-Axis)	397mm	—
Fork Length, Unknown	—	405mm
Trail	68mm high	72.9mm +4.9mm high
Mechanical Trail	64.3mm	68.5mm +4.2mm
Wheel Flop	20.9mm	23.4mm +2.5mm
Tire to Pedal Spindle	72.8mm 170 mm cranks	56.9mm -15.9mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	114mm +3mm 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	53mm	57mm +4mm
Tire Outer Diameter	702mm	722mm +20mm
Bike Length with Tires	1710.9mm	1733mm +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