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 progressive gravel bikes
Geometry
Stack | 619mm | 620mm +1mm |
Reach | 403mm | 389mm -14mm |
Stack to Reach Ratio | 1.54:1 | 1.59:1 |
Seat Tube Length, C-T | 560mm | 520mm -40mm |
Top Tube Length, Effective/Horizontal Center | — | 573mm |
Top Tube Length, Effective/Horizontal HT Top | 594mm | — |
Top Tube Slope | 8.4deg | 12.8deg +4.4deg |
Head Tube Angle | 70deg | 71.25deg +1.25deg |
Seat Tube Angle | 73deg | 72.5deg -0.5deg |
Head Tube Length | 188mm | 190mm +2mm |
Bottom Bracket Drop | 73mm | 75mm +2mm |
Bottom Bracket Height | 266mm | 286mm +20mm |
Chainstay Length | 430mm | 425mm -5mm |
Chainstay Length Horizontal | 423.8mm | 418.3mm -5.5mm |
Front-Center | 654mm | 631mm -23mm |
Front-Center Horizontal | 649.2mm | 626.7mm -22.5mm |
Wheelbase | 1073mm | 1045mm -28mm |
Fork Offset/Rake | 45mm | 50mm +5mm |
Fork Length (On-Axis) | — | 400mm |
Trail | 75.5mm high | 69.7mm -5.8mm high |
Mechanical Trail | 70.9mm | 66mm -4.9mm |
Wheel Flop | 24.3mm | 21.2mm -3.1mm |
Tire to Pedal Spindle | 145mm 170 mm cranks | 100mm -45mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 96mm 170 mm cranks | 116mm +20mm 170 mm cranks |
Build
Wheel Size | 650B/27.5 in 584 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 47mm | 50mm +3mm |
Tire Outer Diameter | 678mm | 722mm +44mm |
Bike Length with Tires | 1751mm | 1767mm +16mm |
| Suspension Type | Rigid, non-suspension corrected | Rigid, non-suspension corrected |
| Bar Type | Drop Bar | Aero 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.seraphbikes.com/Carbon-Fiber-T1000-Gravel-Bike-Frame-GR048-Green-Pink-paint-Speckled-Design-T47-Bottom-Bracket-p6853170.html |
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