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
Somewhat upright stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of Cannondale Topstone
Geometry
Stack | 619mm | 646mm +27mm |
Reach | 403mm | 397mm -6mm |
Stack to Reach Ratio | 1.54:1 | 1.63:1 |
Seat Tube Length, C-T | 560mm | 590mm +30mm |
Top Tube Length, Effective/Horizontal HT Top | 594mm | 593mm -1mm |
Top Tube Length, Actual C-C | — | 574mm |
Top Tube Slope | 8.4deg | 8.2deg -0.2deg |
Head Tube Angle | 70deg | 70.7deg +0.7deg |
Seat Tube Angle | 73deg | 73.1deg +0.1deg |
Head Tube Length | 188mm | 196mm +8mm |
Bottom Bracket Drop | 73mm | 74mm +1mm |
Bottom Bracket Height | 266mm | 277mm +11mm |
Chainstay Length | 430mm | 420mm -10mm |
Chainstay Length Horizontal | 423.8mm | 413.4mm -10.4mm |
Front-Center | 654mm | 659mm +5mm |
Front-Center Horizontal | 649.2mm | 655.6mm +6.4mm |
Wheelbase | 1073mm | 1069mm -4mm |
Fork Offset/Rake | 45mm | 55mm +10mm |
Trail | 75.5mm high | 64.7mm -10.8mm mid/neutral |
Mechanical Trail | 70.9mm | 61mm -9.9mm |
Wheel Flop | 24.3mm | 20.2mm -4.1mm |
Standover Height | — | 864mm |
Tire to Pedal Spindle | 145mm 170 mm cranks | 138mm -7mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 96mm 170 mm cranks | 107mm +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 | 1751mm | 1771mm +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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