2026 Polygon Helios A9 Base 151-161
Build
700C/29 in × 28 mm
Insights
Somewhat aggressive stack and reach vs trend of performance road bikes
Design deviates from other sizes of Polygon Helios A9
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 503mm |
| Reach | 375mm |
| Stack to Reach Ratio | 1.34:1 |
| Seat Tube Length, C-T | 420mm |
| Seat Tube Length, Effective Unknown | 74.7mm |
| Top Tube Length, Effective/Horizontal Center | 513mm |
| Top Tube Slope | 11.4deg |
| Head Tube Angle | 71.3deg |
| Seat Tube Angle | 74.7deg |
| Head Tube Length | 100mm |
| Bottom Bracket Drop | 78mm |
| Bottom Bracket Height | 261mm |
| Chainstay Length | 410mm |
| Chainstay Length Horizontal | 402.5mm |
| Front-Center | 578.8mm |
| Front-Center Horizontal | 573.5mm |
| Wheelbase | 976mm |
| Fork Offset/Rake | 51.8mm |
| Trail | 60.1mm mid/neutral |
| Mechanical Trail | 56.9mm |
| Wheel Flop | 18.3mm |
| Standover Height | 685mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 69.8mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 91mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 28mm |
| Tire Outer Diameter | 678mm |
| Bike Length with Tires | 1654mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Unknown |
| Fork Material | Unknown |
| Brake Type | Unknown |
Published Sizing Recommendations
| Height | 151 cm to 161 cm |
Source:https://www.polygonbikes.com/us/helios-a9-di2-powermeter/