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 aggressive stack and reach vs trend of all-road/gravel bikes
Geometry
Stack | 597mm | 577mm -20mm |
Reach | 390mm | 395.2mm +5.2mm |
Stack to Reach Ratio | 1.53:1 | 1.46:1 |
Seat Tube Length, C-T | 535mm | — |
Seat Tube Length, C-TTT | — | 501mm |
Top Tube Length, Effective/Horizontal HT Top | 569mm | 560mm -9mm |
Top Tube Slope | 8.8deg | 8.1deg -0.7deg |
Head Tube Angle | 70deg | 70deg +0deg |
Seat Tube Angle | 73.5deg | 74deg +0.5deg |
Head Tube Length | 164mm | 163mm -1mm |
Bottom Bracket Drop | 73mm | 69mm -4mm |
Bottom Bracket Height | 266mm | 282mm +16mm |
Chainstay Length | 430mm | 427mm -3mm |
Chainstay Length Horizontal | 423.8mm | 421.4mm -2.4mm |
Front-Center | 633mm | 637.2mm +4.2mm |
Front-Center Horizontal | 628.2mm | 633.6mm +5.4mm |
Wheelbase | 1052mm | 1055mm +3mm |
Fork Offset/Rake | 45mm | 50mm +5mm |
Fork Length, Unknown | — | 395mm |
Trail | 75.5mm high | 74.5mm -1mm high |
Mechanical Trail | 70.9mm | 70.1mm -0.8mm |
Wheel Flop | 24.3mm | 24mm -0.3mm |
Tire to Pedal Spindle | 124mm 170 mm cranks | 116.2mm -7.8mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 96mm 170 mm cranks | 112mm +16mm 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 | 1757mm +27mm |
| 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://pl.aliexpress.com/item/1005003540978175.html?spm=a2g0o.productlist.0.0.5f9b26714F0QzZ&algo_pvid=1ee16a61-6c1d-44c0-bcab-d39c0e28f4a6&algo_exp_id=1ee16a61-6c1d-44c0-bcab-d39c0e28f4a6-4&pdp_ext_f=%7B%22sku_id%22%3A%2212000026224445234%22%7D |
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