Helios A8
OverviewAbout the Polygon Helios A8
The Polygon Helios A8 is a road bike, built on a carbon frame, listed at $4,299.99 at BikesOnline. A drop-bar bike built for sealed roads, speed and distance.
How it comparesThe Helios A8 against similarly priced bikes
- At $4,299.99 it costs less than 69% of the 174 road bikes we list.
- Reach (size M): 400 mm, longer, so a more stretched position than the middle of similarly priced road bikes (388 mm).
- Lowest gear ratio: 1.06, taller (harder on steep climbs) than the middle of similarly priced road bikes (1.00).
- Gears at the back: 12-speed, about the same as similarly priced road bikes (middle 12-speed).
Closest alternatives on price
same price
$200 more
$300 less
$300 less
Compare the Helios A8 with the two closest side by side
Compared with the 35 similar road bikes on BikeFinder priced $3,000 to $5,800, using each bike's published specs and the price shown on its page.
SizingWhat size Helios A8 do I need?
Enter your height to see the size Polygon recommends.
| Size | Rider height | In feet |
|---|---|---|
| XXS | 150 to 160 cm | 4 ft 11 in to 5 ft 3 in |
| XS | 157 to 167 cm | 5 ft 2 in to 5 ft 6 in |
| S | 164 to 174 cm | 5 ft 5 in to 5 ft 9 in |
| M | 171 to 181 cm | 5 ft 7 in to 5 ft 11 in |
| L | 178 to 188 cm | 5 ft 10 in to 6 ft 2 in |
| XL | 185 to 195 cm | 6 ft 1 in to 6 ft 5 in |
Rider heights from Polygon's size chart. Height is a starting point: arm and leg length, flexibility and riding style all matter, so a test ride beats any chart. How bike sizing works.
SpecificationsWhat we know
- Brand
- Polygon
- Category
- Road
- Frame
- Carbon
- Wheel size
- 700c
- Drivetrain
- Shimano Ultegra Di2 2x12
- Brakes
- Disc
- Frame sizes
- XXS, XS, S, M, L, XL
- Price
- $4,299.99 at BikesOnline, was $6,699.99. In stock, checked 3 Nov 2026.
Specs and pricing are listed in AUD and sourced from Australian retail listings. Confirm the current details and availability with the seller before purchase.
GeometrySize M
- Stack
- 533 mm
- Reach
- 400 mm
- Stack/reach
- 1.33
- Head angle
- 72.5 deg
- Seat angle
- 74 deg
- Wheelbase
- 996 mm
- Chainstay
- 410 mm
- BB drop
- 73 mm
- Standover
- 761 mm
GearingRatios
Ratios are derived from the chainrings and cassette. They describe the gearing, not any rider's ability.
Drivetrain & buildFull specification
- Groupset
- Shimano Ultegra Di2
- Shifting
- Electronic
- Drive
- 2x
- Speeds
- 12
- Crank
- Shimano Ultegra FC-R8100, TOKEN T47 BB, 24mm Spindle
- Chainrings
- 52/36
- Cassette
- Shimano Ultegra CS-R8101-12, 11-34T, 12-Speed
- Rear derailleur
- Shimano Ultegra Di2 RD-R8150, Direct Mount, 12-Speed
- Brakes
- Shimano Ultegra BR-R8170 Hydraulic Disc, Flat Mount
- Rotors
- 160/140mm
- Wheelset
- LINC Beta 45 Carbon Disc, 700C, 45mm Depth, 22mm Internal Width, 30mm External Width, F: 20H / R: 24H, Tubeless Ready ( Tubeless Tape Installed )
- Rim internal width
- 22 mm
- Stock tyre
- 700x28c
- Max tyre clearance
- 34 mm
- Tubeless
- Yes
- Fork material
- Carbon
- Seatpost
- Polygon Carbon, Aero Optimised, 0-35mm Adjustable Offset (Note: Length may need adjustment for optimal fit.)
- Cockpit
- Polygon Carbon, 7 deg Angle, Handlebar Clamp: 31.8mm / Polygon Carbon Road, Reach: 90mm, Drop: 125mm, Flare: 10 deg / Widths by Size: XXXS to XS: 345mmS to M: 380mmL to XL: 425mm
- Saddle
- LINC Flux2, Cr-Mo Rails 7mm
- UDH
- Yes
Bike DNAWhat the numbers say
- Position
- Stack-to-reach 1.33 gives a long and low, racier riding position.
- Steering
- A 72.5 deg head angle points to balanced steering.
- Climbing
- Lowest ratio 1.06 is endurance-friendly gearing.
Derived from the published geometry and gearing above. It describes the numbers, not a ride test.
BikeFinder Data Profile: geometry and specification researched from published sources (BikesOnline product page (specification list and geometry table)), verified 2026-11-03. This is a specification analysis, not a physical ride review.
Where to buyStockist
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