Compare: 2024 TWITTER Bikes Gravel v1 Base 540 vs 2026 BMC Switzerland Roadmachine 01 Base 61

Insights

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

Design deviates from other sizes of TWITTER Bikes Gravel v1

Somewhat upright stack and reach vs trend of endurance road bikes

Stack	610.5mm	645mm +34.5mm
Reach	407.3mm	398mm -9.3mm
Stack to Reach Ratio	1.5:1	1.62:1
Seat Tube Length, C-T	540mm	550mm +10mm
Top Tube Length, Effective/Horizontal Center	593.9mm	—
Top Tube Length, Actual C-C	—	581mm
Top Tube Slope	9.5deg	11.9deg +2.4deg
Head Tube Angle	73.5deg	72.2deg -1.3deg
Seat Tube Angle	73deg	74.2deg +1.2deg
Head Tube Length	190mm	233mm +43mm
Bottom Bracket Drop	70mm	75mm +5mm
Bottom Bracket Height	281mm	268mm -13mm
Chainstay Length	420mm	415mm -5mm
Chainstay Length Horizontal	414.1mm	408.2mm -5.9mm
Front-Center	629.7mm	633mm +3.3mm
Front-Center Horizontal	624.9mm	627.8mm +2.9mm
Wheelbase	1039mm	1036mm -3mm
Fork Offset/Rake	55mm	45mm -10mm
Fork Length (On-Axis)	—	379mm
Fork Length, Unknown	390mm	—
Trail	46.6mm mid/neutral	62.9mm +16.3mm mid/neutral
Mechanical Trail	44.7mm	59.9mm +15.2mm
Wheel Flop	12.7mm	18.3mm +5.6mm
Standover Height	—	849mm
Tire to Pedal Spindle	108.7mm 170 mm cranks	115mm +6.3mm 175 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	93mm -18mm 175 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	40mm	32mm -8mm
Tire Outer Diameter	702mm	686mm -16mm
Bike Length with Tires	1741mm	1722mm -19mm
Crank Length	—	175mm
Handlebar Width	—	430478mm
Stem Length	—	110mm
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