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
Very upright stack and reach vs trend of all-road/gravel bikes
Geometry
Stack | 575mm | 590mm +15mm |
Reach | 377mm | 365mm -12mm |
Stack to Reach Ratio | 1.53:1 | 1.62:1 |
Seat Tube Length, C-T | 510mm | — |
Seat Tube Length, C-TTT | — | 520mm |
Top Tube Length, Effective/Horizontal Center | — | 545mm |
Top Tube Length, Effective/Horizontal HT Top | 549mm | — |
Top Tube Slope | 9.4deg | 8deg -1.4deg |
Head Tube Angle | 70deg | 71.5deg +1.5deg |
Seat Tube Angle | 73.5deg | 73deg -0.5deg |
Head Tube Length | 139mm | 150mm +11mm |
Bottom Bracket Drop | 75mm | 80mm +5mm |
Bottom Bracket Height | 264mm | 288mm +24mm |
Chainstay Length | 430mm | 430mm +0mm |
Chainstay Length Horizontal | 423.4mm | 422.5mm -0.9mm |
Front-Center | 612mm | 598.9mm -13.1mm |
Front-Center Horizontal | 606.6mm | 593.5mm -13.1mm |
Wheelbase | 1030mm | 1016mm -14mm |
Fork Offset/Rake | 45mm | 54.9mm +9.9mm |
Fork Length (On-Axis) | — | 405mm |
Trail | 75.5mm high | 65.3mm -10.2mm high |
Mechanical Trail | 70.9mm | 61.9mm -9mm |
Wheel Flop | 24.3mm | 19.6mm -4.7mm |
Tire to Pedal Spindle | 103mm 170 mm cranks | 60.9mm -42.1mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 94mm 170 mm cranks | 118mm +24mm 170 mm cranks |
Build
Wheel Size | 650B/27.5 in 584 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 47mm | 57mm +10mm |
Tire Outer Diameter | 678mm | 736mm +58mm |
Bike Length with Tires | 1708mm | 1752mm +44mm |
| 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/ | Mondince.com |
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