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
Average stack and reach vs trend of all-road/gravel bikes
Geometry
Stack | 575mm | 581mm +6mm |
Reach | 377mm | 380mm +3mm |
Stack to Reach Ratio | 1.53:1 | 1.53:1 |
Seat Tube Length, C-T | 510mm | 490mm -20mm |
Top Tube Length, Effective/Horizontal HT Top | 549mm | 552mm +3mm |
Top Tube Slope | 9.4deg | 12.1deg +2.7deg |
Head Tube Angle | 70deg | 71deg +1deg |
Seat Tube Angle | 73.5deg | 73.5deg +0deg |
Head Tube Length | 139mm | 130mm -9mm |
Bottom Bracket Drop | 75mm | 71mm -4mm |
Bottom Bracket Height | 264mm | 284mm +20mm |
Chainstay Length | 430mm | 430mm +0mm |
Chainstay Length Horizontal | 423.4mm | 424.1mm +0.7mm |
Front-Center | 612mm | 607.1mm -4.9mm |
Front-Center Horizontal | 606.6mm | 602.9mm -3.7mm |
Wheelbase | 1030mm | 1027mm -3mm |
Fork Offset/Rake | 45mm | 50mm +5mm |
Trail | 75.5mm high | 69.4mm -6.1mm high |
Mechanical Trail | 70.9mm | 65.6mm -5.3mm |
Wheel Flop | 24.3mm | 21.4mm -2.9mm |
Tire to Pedal Spindle | 103mm 170 mm cranks | 79.6mm -23.4mm 172.5 mm cranks |
Pedal Spindle to Ground Clearance | 94mm 170 mm cranks | 111.5mm +17.5mm 172.5 mm cranks |
Build
Wheel Size | 650B/27.5 in 584 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 47mm | 44mm -3mm |
Tire Outer Diameter | 678mm | 710mm +32mm |
Bike Length with Tires | 1708mm | 1737mm +29mm |
Crank Length | — | 172.5mm |
Handlebar Width | — | 420mm |
Stem Length | — | 90mm |
| 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.lapierrebikes.com/nl-en/o/crosshill-cf-60-s-2025/ |
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