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 | 615mm +18mm |
Reach | 390mm | 389mm -1mm |
Stack to Reach Ratio | 1.53:1 | 1.58:1 |
Seat Tube Length, C-T | 535mm | 554mm +19mm |
Top Tube Length, Effective/Horizontal HT Top | 569mm | 576mm +7mm |
Top Tube Length, Actual C-C | — | 557mm |
Top Tube Slope | 8.8deg | 8.8deg +0deg |
Head Tube Angle | 70deg | 70.7deg +0.7deg |
Seat Tube Angle | 73.5deg | 73.1deg -0.4deg |
Head Tube Length | 164mm | 164mm +0mm |
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 | 633mm | 641mm +8mm |
Front-Center Horizontal | 628.2mm | 636.6mm +8.4mm |
Wheelbase | 1052mm | 1050mm -2mm |
Fork Offset/Rake | 45mm | 54.9mm +9.9mm |
Trail | 75.5mm high | 64.8mm -10.7mm mid/neutral |
Mechanical Trail | 70.9mm | 61.2mm -9.7mm |
Wheel Flop | 24.3mm | 20.2mm -4.1mm |
Standover Height | — | 831mm |
Tire to Pedal Spindle | 124mm 170 mm cranks | 120mm -4mm 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 | 1730mm | 1752mm +22mm |
| 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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