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

Insights

Somewhat upright stack and reach vs trend of endurance road bikes

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

Design deviates from other sizes of TWITTER Bikes Gravel v1

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

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	32mm	40mm +8mm
Tire Outer Diameter	686mm	702mm +16mm
Bike Length with Tires	1722mm	1741mm +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