2026 Polygon Helios A9 Base 162-170
Build
700C/29 in × 28 mm
Insights
Somewhat aggressive stack and reach vs trend of performance road bikes
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 523mm |
| Reach | 390mm |
| Stack to Reach Ratio | 1.34:1 |
| Seat Tube Length, C-T | 489mm |
| Seat Tube Length, Effective Unknown | 74mm |
| Top Tube Length, Effective/Horizontal Center | 540mm |
| Top Tube Slope | 5.8deg |
| Head Tube Angle | 72.3deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 120mm |
| Bottom Bracket Drop | 73mm |
| Bottom Bracket Height | 266mm |
| Chainstay Length | 410mm |
| Chainstay Length Horizontal | 403.5mm |
| Front-Center | 586.1mm |
| Front-Center Horizontal | 581.6mm |
| Wheelbase | 985mm |
| Fork Offset/Rake | 45.7mm |
| Trail | 60.3mm mid/neutral |
| Mechanical Trail | 57.4mm |
| Wheel Flop | 17.5mm |
| Standover Height | 752mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 77.1mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 96mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 28mm |
| Tire Outer Diameter | 678mm |
| Bike Length with Tires | 1663mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Unknown |
| Fork Material | Unknown |
| Brake Type | Unknown |
Published Sizing Recommendations
| Height | 162 cm to 170 cm |
Source:https://www.polygonbikes.com/us/helios-a9-di2-powermeter/