Helios A7X
Polygon
Race
Helios A7X is a carbon race road bike (2024), by Polygon, from the Helios lineup. This model is best for riders who want a sporty road feel without a full race fit, leaning toward a sporty riding position, while being best matched to paved roads. Based on the metrics, key strengths are strong value-for-money versus many similar bikes, an aero-leaning setup that still keeps some versatility, and strong speed potential on smoother terrain. At the same time, compared with more specialized alternatives, the compromise is a firmer ride feel than comfort-first options and a more specific fit setup that may suit fewer riders. Add this bike to compare on MatchBikes.com and see how it stacks up against similar race models.
Rating

Score Summary
Performance
Built for speed and efficiency
Fit
Dialed-in Fit & Comfort
Value
Specifications
General
Frame
Drivetrain
Wheels
Brakes
Cockpit
Seat
Geometry
| Measurement | XXS | XS | SM | MD | LG | XL |
|---|---|---|---|---|---|---|
| Stack Reach Ratio | 1.37 mm | 1.39 mm | 1.41 mm | 1.43 mm | 1.45 mm | 1.47 mm |
| Bottom Bracket Height | 271 mm | 271 mm | 271 mm | 271 mm | 271 mm | 271 mm |
| Front Center | 565 mm | 572 mm | 580 mm | 587 mm | 597 mm | 602 mm |
| Rake | 43 mm | 43 mm | 43 mm | 43 mm | 43 mm | 43 mm |
| Trail | 67 mm | 65 mm | 64 mm | 62 mm | 62 mm | 59 mm |
| Stack | 504 mm | 519.21 mm | 534.2 mm | 549.4 mm | 563.7 mm | 579.8 mm |
| Reach | 369 mm | 374 mm | 379 mm | 384 mm | 389 mm | 394 mm |
| Top Tube Length | 504.31 mm | 516.31 mm | 529.42 mm | 542.04 mm | 554.14 mm | 568.25 mm |
| Seat Tube Angle | 75 ° | 74.7 ° | 74.3 ° | 74 ° | 73.7 ° | 73.3 ° |
| Seat Tube Length | 450 mm | 475 mm | 500 mm | 520 mm | 545 mm | 570 mm |
| Head Tube Angle | 71.5 ° | 71.8 ° | 72 ° | 72.3 ° | 72.3 ° | 72.8 ° |
| Head Tube Length | 100 mm | 115 mm | 130 mm | 145 mm | 160 mm | 175 mm |
| Chainstay Length | 414 mm | 414 mm | 414 mm | 414 mm | 414 mm | 414 mm |
| Wheelbase | 967 mm | 974 mm | 982 mm | 990 mm | 999 mm | 1004 mm |
| Bottom Bracket Drop | 73 mm | 73 mm | 73 mm | 73 mm | 73 mm | 73 mm |
| Standover Height | 715 mm | 738 mm | 762 mm | 779 mm | 801 mm | 823 mm |
| Wheels | 700 | 700 | 700 | 700 | 700 | 700 |


















































