Compare: 2025 Avenger FREEDOM Base S vs 2026 TanTan Cycling (Seraph) GR257 Base 510

Insights

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

Design deviates from other sizes of Avenger FREEDOM

Somewhat upright stack and reach vs trend of progressive gravel bikes

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

Stack	547mm	540mm -7mm
Reach	369mm	369mm +0mm
Stack to Reach Ratio	1.48:1	1.46:1
Seat Tube Length, C-TTT	—	488mm
Seat Tube Length, Unknown	460mm	—
Top Tube Length, Effective/Horizontal Center	—	521mm
Top Tube Length, Effective/Horizontal Unknown	531mm	—
Top Tube Slope	12deg	5.7deg -6.3deg
Head Tube Angle	71deg	71deg +0deg
Seat Tube Angle	73.5deg	74.3deg +0.8deg
Head Tube Length	122mm	108mm -14mm
Bottom Bracket Drop	70mm	72mm +2mm
Bottom Bracket Height	281mm	289mm +8mm
Chainstay Length	430mm	435mm +5mm
Chainstay Length Horizontal	424.3mm	429mm +4.7mm
Front-Center	589.8mm	593.4mm +3.6mm
Front-Center Horizontal	585.6mm	589mm +3.4mm
Wheelbase	1009.9mm	1018mm +8.1mm
Fork Offset/Rake	45mm	55mm +10mm
Fork Length (On-Axis)	400mm	—
Fork Length, Unknown	—	405mm
Trail	73.3mm high	66.1mm -7.2mm high
Mechanical Trail	69.3mm	62.5mm -6.8mm
Wheel Flop	22.6mm	20.4mm -2.2mm
Tire to Pedal Spindle	68.8mm 170 mm cranks	62.4mm -6.4mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	119mm +8mm 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	1711.9mm	1740mm +28.1mm
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