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 | 597mm | 597mm +0mm |
Reach | 390mm | 383mm -7mm |
Stack to Reach Ratio | 1.53:1 | 1.56:1 |
Seat Tube Length, C-T | 535mm | 518mm -17mm |
Top Tube Length, Effective/Horizontal HT Top | 569mm | 564mm -5mm |
Top Tube Length, Actual C-C | — | 543mm |
Top Tube Slope | 8.8deg | 10.8deg +2deg |
Head Tube Angle | 70deg | 70.7deg +0.7deg |
Seat Tube Angle | 73.5deg | 73.1deg -0.4deg |
Head Tube Length | 164mm | 142mm -22mm |
Bottom Bracket Drop | 73mm | 76mm +3mm |
Bottom Bracket Height | 266mm | 275mm +9mm |
Chainstay Length | 430mm | 420mm -10mm |
Chainstay Length Horizontal | 423.8mm | 413.1mm -10.7mm |
Front-Center | 633mm | 628mm -5mm |
Front-Center Horizontal | 628.2mm | 622.9mm -5.3mm |
Wheelbase | 1052mm | 1036mm -16mm |
Fork Offset/Rake | 45mm | 54.3mm +9.3mm |
Trail | 75.5mm high | 65.4mm -10.1mm high |
Mechanical Trail | 70.9mm | 61.8mm -9.1mm |
Wheel Flop | 24.3mm | 20.4mm -3.9mm |
Standover Height | — | 800mm |
Tire to Pedal Spindle | 124mm 170 mm cranks | 107mm -17mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 96mm 170 mm cranks | 105mm +9mm 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 | 1730mm | 1738mm +8mm |
| 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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