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Is This The Fastest Road Bike For The Money? | Polygon Helios Review
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Time to read 4 min
The Polygon Helios range has been completely re-designed for speed. In this review I walk youthrough the Helios line-up, from the entry-level A7 and A8 mechanical bikes through to theA7X, A8X and flagship A9X Di2 models. All bikes share the same UCI-approved ACX carbonframe, disc brakes and carbon wheelsets, so your choice comes down to components andintended use. Here’s everything you need to know before pulling the trigger on one of thefastest aero road bikes for the money.
Table of Content
Summary: The new Helios frame uses a raindrop-inspired profile to cut drag by 31 % and weighs roughly800 g, with a reinforced bottom bracket and chainstay for maximum power transfer [1][2].Every model—A7, A8, A7X, A8X and A9X—shares this UCI-approved ACX carbon frame, discbrakes and carbon wheels ranging from 30 mm to 50 mm deep. The A7 and A8 rely on proven11-speed mechanical groupsets (105 and Ultegra) with FSA cockpits, while the A7X, A8X andA9X adopt 12-speed Di2 drivetrains and integrated cockpits. Entry-level riders will appreciatethe value of the A7/A8; enthusiasts stepping up to electronic shifting should look at theA7X/A8X; and committed racers will find the A9X—and its optional power meter and deeperwheels—to be the ultimate race weapon.
Helios A - Collection
What makes the Helios stand out?
The latest Helios chassis is all about squeezing every possible watt out of your legs. Polygon’sengineers modelled the frame shape on a raindrop to slice through the air, claiming anindustry-leading 31 % reduction in drag compared with the previous Helios [1]. The tubeprofiles blend into a slender head tube and aero seatpost while still accommodating hidden discbrake hoses. Because the same frame is used across the range, you aren’t paying more forcarbon quality—the upgrades come from drivetrains, wheel depth and cockpits.At roughly 800 g, the ACX carbon chassis is impressively light [2]. Reinforcements around thebottom bracket and right chainstay stiffen the frame for efficient power transfer [2], so whenyou jump out of the saddle the bike responds instantly. Polygon also increased tire clearanceand refined the geometry to improve handling and cornering [3]. Running 28 mm tyres notonly reduces rolling resistance but adds confidence in wet or rough conditions, and the framesare UCI legal should you want to race.
Breaking down the models
A7X – Entry to electronic shifting
The A7X marks the start of Polygon’s Di2 line. Shimano’s 105 Di2 brings the first taste of12-speed electronic shifting to the masses, giving you super-smooth gear changes no matter the conditions. The bike retains the 50 mm Entity wheels but swaps the cockpit for a sleeker BlackTek R8 integrated bar and stem, reducing drag and giving a stealthy look. There’s notop-hood shifter like on the higher-end groupsets, but the ergonomics mirror Ultegra andDura-Ace. For riders ready to move beyond mechanical shifting, this is the sweet spot.
A8X – Ultegra Di2 performance
The A8X ramps up performance with Shimano’s Ultegra Di2. You still get 12 gears, but shiftingis faster and you can customise button functions through Shimano’s E-Tube app. The brakesuse Servo Wave technology for a more immediate bite when descending. TheVision Metron 5D cockpit adds stiffness and aerodynamic shaping, while the 50 mm EntityWR5 wheels balance aero benefits with manageable cross-wind handling. You can shift fromthe tops of the hoods, maintain an aero tuck and sprint or climb without missing a beat. It’sideal for riders clocking serious kilometres and chasing PRs.
A9X – Flagship race weapon
At the pinnacle sits the A9X, spec’d with Shimano’s Dura-Ace Di2. It shares the Vision Metron5D cockpit and 50 mm carbon wheels with the A8X but shaves a few grams thanks to thetop-tier drivetrain. Servo Wave brakes and Hyperglide Plus shifting give instantaneous shiftsunder load, and the Di2 lever tops are programmed for sprint shifts. For ultimate performanceyou can upgrade to C60 deep-section wheels and add a power meter to track every watt. Ifyou regularly line up at races or crave the best-of-the-best, the A9X delivers.
Who should ride which Helios?
- A7 / A8 – Newer riders or those on a budget who still want a high-performance carbonframe. The mechanical groupsets are easy to service and incredibly reliable.
- A7X – Enthusiasts who’ve tried mechanical bikes and are ready to jump into electronicshifting without breaking the bank. Perfect for club races and spirited group rides.
- A8X – Riders training seriously or racing regularly. Ultegra Di2, Servo Wave brakes andan aero cockpit make this the value/performance sweet spot.
- A9X – Seasoned racers and data nerds. Dura-Ace Di2, optional C60 wheels and powermeter compatibility put nothing between you and the podium.
How much faster is the new Helios frame compared with the old one?
Polygon’s new frame shape is inspired by a raindrop and achieves around a 31 % reductionin drag over the previous generation [1]. It also weighs roughly 800 g [2].
Do all models use the same frame?
Yes. From the entry-level A7 to the top-end A9X, the same UCI-approved ACX carbon frameand fork are used. You’re paying for components like drivetrain, wheel depth and cockpit, notfor a better frame.
What’s the benefit of Di2 over mechanical shifting?
Shimano’s Di2 systems (found on the A7X, A8X and A9X) provide lightning-fast electronicshifts under load, programmable button functions and additional brake hood buttons onhigher-end models. They also self-adjust to maintain perfect indexing. Mechanical systems aresimpler and cheaper but require more maintenance and effort to shift.
Are the Helios bikes comfortable for long rides?
Absolutely. The ACX frame’s refined geometry and wider tire clearance allow you to run28 mm tyres for lower rolling resistance and better comfort [3]. Carbon wheels and disc brakesalso add confidence and control on descents.
Jared Morgan
BikesOnline....
