Bike-on-Bike
Default Config
Default Config
Insights
Average stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of Serk Titanium A21
Average stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of Cannondale Topstone
Geometry
Stack | 575mm | 561mm -14mm |
Reach | 377mm | 373mm -4mm |
Stack to Reach Ratio | 1.53:1 | 1.5:1 |
Seat Tube Length, C-T | 510mm | 446mm -64mm |
Top Tube Length, Effective/Horizontal HT Top | 549mm | 543mm -6mm |
Top Tube Length, Actual C-C | — | 520mm |
Top Tube Slope | 9.4deg | 15deg +5.6deg |
Head Tube Angle | 70deg | 70.7deg +0.7deg |
Seat Tube Angle | 73.5deg | 73.1deg -0.4deg |
Head Tube Length | 139mm | 101mm -38mm |
Bottom Bracket Drop | 75mm | 79mm +4mm |
Bottom Bracket Height | 264mm | 272mm +8mm |
Chainstay Length | 430mm | 420mm -10mm |
Chainstay Length Horizontal | 423.4mm | 412.5mm -10.9mm |
Front-Center | 612mm | 605mm -7mm |
Front-Center Horizontal | 606.6mm | 599.5mm -7.1mm |
Wheelbase | 1030mm | 1012mm -18mm |
Fork Offset/Rake | 45mm | 54.5mm +9.5mm |
Trail | 75.5mm high | 65.2mm -10.3mm high |
Mechanical Trail | 70.9mm | 61.6mm -9.3mm |
Wheel Flop | 24.3mm | 20.3mm -4mm |
Standover Height | — | 741mm |
Tire to Pedal Spindle | 103mm 170 mm cranks | 84mm -19mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 94mm 170 mm cranks | 102mm +8mm 170 mm cranks |
Build
Wheel Size | 650B/27.5 in 584 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 47mm | 40mm -7mm |
Tire Outer Diameter | 678mm | 702mm +24mm |
Bike Length with Tires | 1708mm | 1714mm +6mm |
| Suspension Type | Rigid, non-suspension corrected | Rigid, non-suspension corrected |
| Bar Type | Drop Bar | Drop Bar |
| Frame Material | Titanium | Carbon/Composite |
| Fork Material | Carbon/Composite | Carbon/Composite |
| Brake Type | Disc | Disc |
Meta
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| Source | https://www.serk.cc/a21/ | https://www.cannondale.com/en-us/bikes/road/gravel/topstone-carbon/topstone-carbon-1-axs |
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