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 | 579mm +4mm |
Reach | 377mm | 378mm +1mm |
Stack to Reach Ratio | 1.53:1 | 1.53:1 |
Seat Tube Length, C-T | 510mm | 482mm -28mm |
Top Tube Length, Effective/Horizontal HT Top | 549mm | 554mm +5mm |
Top Tube Length, Actual C-C | — | 531mm |
Top Tube Slope | 9.4deg | 12.8deg +3.4deg |
Head Tube Angle | 70deg | 70.7deg +0.7deg |
Seat Tube Angle | 73.5deg | 73.1deg -0.4deg |
Head Tube Length | 139mm | 123mm -16mm |
Bottom Bracket Drop | 75mm | 76mm +1mm |
Bottom Bracket Height | 264mm | 275mm +11mm |
Chainstay Length | 430mm | 420mm -10mm |
Chainstay Length Horizontal | 423.4mm | 413.1mm -10.3mm |
Front-Center | 612mm | 617mm +5mm |
Front-Center Horizontal | 606.6mm | 612.9mm +6.3mm |
Wheelbase | 1030mm | 1026mm -4mm |
Fork Offset/Rake | 45mm | 55.5mm +10.5mm |
Trail | 75.5mm high | 64.1mm -11.4mm mid/neutral |
Mechanical Trail | 70.9mm | 60.5mm -10.4mm |
Wheel Flop | 24.3mm | 20mm -4.3mm |
Standover Height | — | 772mm |
Tire to Pedal Spindle | 103mm 170 mm cranks | 96mm -7mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 94mm 170 mm cranks | 105mm +11mm 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 | 1728mm +20mm |
| 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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