Bike-on-Bike
Default Config
Default Config
Insights
Somewhat upright 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 | 548mm | 560mm +12mm |
Reach | 364mm | 364mm +0mm |
Stack to Reach Ratio | 1.51:1 | 1.54:1 |
Seat Tube Length, C-T | 485mm | 450mm -35mm |
Top Tube Length, Effective/Horizontal Center | — | 522mm |
Top Tube Length, Effective/Horizontal HT Top | 523mm | — |
Top Tube Slope | 9.3deg | 14.6deg +5.3deg |
Head Tube Angle | 70deg | 70.75deg +0.75deg |
Seat Tube Angle | 74deg | 74.25deg +0.25deg |
Head Tube Length | 110mm | 130mm +20mm |
Bottom Bracket Drop | 75mm | 75mm +0mm |
Bottom Bracket Height | 264mm | 286mm +22mm |
Chainstay Length | 430mm | 425mm -5mm |
Chainstay Length Horizontal | 423.4mm | 418.3mm -5.1mm |
Front-Center | 589mm | 591mm +2mm |
Front-Center Horizontal | 584.6mm | 586.7mm +2.1mm |
Wheelbase | 1008mm | 1005mm -3mm |
Fork Offset/Rake | 45mm | 50mm +5mm |
Fork Length (On-Axis) | — | 400mm |
Trail | 75.5mm high | 73.1mm -2.4mm high |
Mechanical Trail | 70.9mm | 69mm -1.9mm |
Wheel Flop | 24.3mm | 22.8mm -1.5mm |
Tire to Pedal Spindle | 80mm 170 mm cranks | 60mm -20mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 94mm 170 mm cranks | 116mm +22mm 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 | 1686mm | 1727mm +41mm |
| 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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