Compare: 2025 Avenger FREEDOM 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 Avenger FREEDOM

Somewhat upright stack and reach vs trend of progressive gravel bikes

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

Stack	562.1mm	560mm -2.1mm
Reach	376.5mm	376mm -0.5mm
Stack to Reach Ratio	1.49:1	1.49:1
Seat Tube Length, C-TTT	—	524mm
Seat Tube Length, Unknown	510mm	—
Top Tube Length, Effective/Horizontal Center	—	540mm
Top Tube Length, Effective/Horizontal Unknown	543mm	—
Top Tube Slope	8deg	4.1deg -3.9deg
Head Tube Angle	71deg	71deg +0deg
Seat Tube Angle	73.5deg	73.7deg +0.2deg
Head Tube Length	138mm	132mm -6mm
Bottom Bracket Drop	70mm	69mm -1mm
Bottom Bracket Height	281mm	292mm +11mm
Chainstay Length	430mm	435mm +5mm
Chainstay Length Horizontal	424.3mm	429.5mm +5.2mm
Front-Center	602.6mm	607.4mm +4.8mm
Front-Center Horizontal	598.5mm	603.5mm +5mm
Wheelbase	1022.8mm	1033mm +10.2mm
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	81.6mm 170 mm cranks	76.4mm -5.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	122mm +11mm 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	1724.8mm	1755mm +30.2mm
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