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 | 597mm | 601mm +4mm |
Reach | 390mm | 386mm -4mm |
Stack to Reach Ratio | 1.53:1 | 1.56:1 |
Seat Tube Length, C-T | 535mm | 520mm -15mm |
Top Tube Length, Effective/Horizontal HT Top | 569mm | 570mm +1mm |
Top Tube Slope | 8.8deg | 10.9deg +2.1deg |
Head Tube Angle | 70deg | 71.5deg +1.5deg |
Seat Tube Angle | 73.5deg | 73deg -0.5deg |
Head Tube Length | 164mm | 150mm -14mm |
Bottom Bracket Drop | 73mm | 71mm -2mm |
Bottom Bracket Height | 266mm | 284mm +18mm |
Chainstay Length | 430mm | 430mm +0mm |
Chainstay Length Horizontal | 423.8mm | 424.1mm +0.3mm |
Front-Center | 633mm | 616mm -17mm |
Front-Center Horizontal | 628.2mm | 611.9mm -16.3mm |
Wheelbase | 1052mm | 1036mm -16mm |
Fork Offset/Rake | 45mm | 50mm +5mm |
Trail | 75.5mm high | 66.1mm -9.4mm high |
Mechanical Trail | 70.9mm | 62.6mm -8.3mm |
Wheel Flop | 24.3mm | 19.9mm -4.4mm |
Tire to Pedal Spindle | 124mm 170 mm cranks | 88.5mm -35.5mm 172.5 mm cranks |
Pedal Spindle to Ground Clearance | 96mm 170 mm cranks | 111.5mm +15.5mm 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 | 1730mm | 1746mm +16mm |
Crank Length | — | 172.5mm |
Handlebar Width | — | 440mm |
Stem Length | — | 100mm |
| 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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