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Description

PERFORMANCE AERO

The Polygon Helios A9X is a UCI-approved carbon aero race bike weighing just 7.7kg, this machine is engineered for speed and performance. Whether you’re an aspiring racer chasing the podium or seeking an aerodynamic lightweight ride, the Helios A9X delivers the speed and agility you need to beat PRs and the competition.

LOOKS FAST, FEELS FASTER.

The Helios A9X ACX carbon frame, weighing a mere 800g, is meticulously designed for aerodynamic efficiency, boasting a 31% reduction in drag over the previous generation. Wider clearance for 28c tyres enhances comfort without sacrificing speed, while reinforcements in the bottom bracket, chainstay, and thru-axles ensure that every watt of your effort translates into pure speed on the road.

A TRUSTED BRAND

Polygon boasts over 30 years of experience and is known for offering high-performance bikes at competitive prices. Polygon road bikes have led to numerous national titles and even a victory at the 2023 Tour De Taiwan. With a 5-year frame warranty, you can trust Polygon to deliver from the factory to the track.

INDUSTRY REVIEW

“Impressive value for money” - Ride Media

SHIMANO DURA-ACE Di2 GROUPSET

Enjoy lightning-fast, precise gear changes with a simple touch of the levers. Conquer any terrain, from challenging climbs to swift descents, with the wide-range 11-34T cassette and versatile 52/36T chainrings.

CARBON WHEELS

Experience a competitive edge with Entity WR5 tubeless-ready carbon wheels. The 50mm deep-section rim profile optimizes aerodynamics, slicing through the wind for increased speed.

MORE POWER

Upgrade your Helios A9X with the optional Shimano Dura-Ace power meter for precise performance tracking. Analyze your power output and pedal stroke to fine-tune your training and racing strategies, taking your cycling to the next level.

INTEGRATED

The fully integrated Vision Metron cockpit strikes the perfect balance between simplicity and aero engineering. It features an inbuilt GPS mount and full carbon construction.

Components

FRAMESET
FRAME
ACX Performance Carbon UCI Approved, Internal Cable Routing, Shimano KSMBB9241B Press Fit Bottom Bracket, 12x142mm Thru-Axle, Flat Mount Disc
SUSPENSION
FORK
ACX Performance Carbon UCI Approved, 12x100mm Thru-Axle, Flat Mount Disc
DRIVETRAIN
REAR DERAILLEUR
Shimano Dura-Ace Di2 RD-R9250, 12-Speed
FRONT DERAILLEUR
Shimano Dura-Ace Di2 FD-R9250, Braze-On
SHIFTER
Shimano Dura-Ace Di2 ST-R9270, 12-Speed
CRANK
Shimano Dura-Ace FC-9200, HollowTech 2, 12-Speed, XS-M:170mm, L-XL:172.5mm
CHAINRING
52/36T
CASSETTE
Shimano Dura-Ace CS-R9250, 12-Speed, 11-34T
CHAIN
Shimano CN-M8100, 12-Speed
BRAKES
FRONT BRAKE
Shimano Dura-Ace BR-R9270, Hydraulic Disc, 160mm Center Lock
REAR BRAKE
Shimano Dura-Ace BR-R9270, Hydraulic Disc, 140mm Center Lock
WHEELS
REAR HUB
Entity WR5 Carbon Disc, 900g, 21mm Internal Width, 50mm Depth, Novatec D792SB-X12 Hub, 24H, Stainless Straight Pull Butte Spokes, Tubeless Tape Installed / Shimano C60 Dura-Ace Carbon Disc, 858g, 21mm Internal Width, 60mm Depth, 24H, Tubeless Tape Installed
TYRE
Schwalbe One Addix TLE, 700x28C, Tubeless Ready
MAX TYRE SIZE
28c
INNER TUBE
Entity Inner Tube, 80mm Presta Valve
CONTACT POINTS
HANDLEBAR
Vision Metron 5D ACR Integrated, 400mm Width (XS-S), 420mm Width (M-L), 420mm (XL), 80mm Reach, 125mm Drop
SADDLE
Entity Flux2
SEATPOST
Polygon Carbon Aero Seatpost, 35x337mm (XS), 357mm (S-XL), 20mm Adjustable Offset
STEM
Vision Metron 5D ACR Integrated, 100mm Length (XS-S), 110mm Length (M-L), 120mm Length (XL), 6-Degree
WEIGHT
BIKE WEIGHT
17lbs (Size L)

Geometry

Size XXS XS S M L XL
Height (ft/in) 4'11" - 5'3" 5'1" - 5'5" 5'4" - 5'7" 5'6" - 5'9" 5'8" - 5'11" 5'11" - 6'2"
Seat Tube Length (F) 450 475 500 520 545 570
Seat Tube Angle (E) 75° 74.7° 74.3° 74° 73.7° 73.3°
Head Tube Length (D) 100 115 130 145 160 175
Head Tube Angle (C) 71.5° 71.8° 72° 72.3° 72.3° 72.8°
Effective Top Tube (G) 505.31 517.31 530.42 543.04 555.14 569.25
BB Height (I) 271 271 271 271 271 271
BB Offset (H) 73 73 73 73 73 73
Chainstay Length (J) 415 415 415 415 415 415
Wheelbase (K) 968.42 975.82 983.9 991.1 1000.62 1005.8
Frame Reach (B) 370 375 380 385 390 395
Frame Stack (A) 505 520.21 535.2 550.4 564.7 580.8
Standover Height (L) 715.04 739.4 763.21 780.8 802.52 824.28


*All lengths in mm unless otherwise stated

Assembly

Your bike needs minor assembly before riding; use the tools and videos included.

As a guide, it'll take 10-40min depending on whether you're an experienced bike assembler or have little to no mechanical experience.

Side Note: Your cables will stretch during the initial bed-in period and must be adjusted by an experienced mechanic around 150km of riding.

Step 1

Unboxing Your Bike

Step 2

Bike Fit Setup

Step 3

Tyre Pressure Setup

Step 4

Pre-Ride Check

Customer Reviews
4.8 Based on 25 Reviews
5 ★
77% 
20
4 ★
23% 
6
3 ★
0% 
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2 ★
0% 
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Customer Photos
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20 Jun 2025
Adrian D.
Australia

Helios 9x

Customer service, transport and packaging is of the highest level. Received the bike within 2 days. Setup was easy. Great work Bikes Online! Helios 9X looks beautiful! Bike was however slightly heavier than advertised around 7.9kg for a small frame 9x model instead of 7.7KG for a large frame. Bike is 100% value for the money. It went straight on a diet. New Saddle -200g , tubeless setup new super light wheels 58/50 rim depth and GP5000 TR tyres -520g , favero duo power pedals + 300g, bottle cages 50g and the computer mount. The bike weighed a reasonable 7.59kg

A
19 Jun 2025
Adrian
Australia

Helios 9x

Bikes online does a fantastic job in regards to communication and postage. Bike arrived within 2 days, easy to put together. Very professional!! Thanks bikes online. 🙏 Received the bike, put it together and weighed it. For a small frame it was 7.95kg which is a bit heavier than the claimed 7.7kg for a large frame build. I Noticed the wheel set was a different brand (Novatec) from the illustrated Entity wheels set. Modifications: Added Assimo power pedals +300g, 2 bottle cages +50g, computer mount +20g, saddle -200g, new wheels with sealant -530g and new bar tape + 20g = Total bike weight 7.59.🤙 which is not far off from the expected 7.3kg

BikesOnline US Polygon Helios A9X - Dura-Ace Di2 Carbon Road Bike ReviewBikesOnline US Polygon Helios A9X - Dura-Ace Di2 Carbon Road Bike Review
BO
10 Jun 2025
Brendan O.
Australia

Amazing build list, surprisingly refined

Solid wheels, not the most compliant frame but not the more harsh. Seat post tolerance too slack, but additional clamp provided solves any slippage. Sound geometry and responsive on fast corners.

BikesOnline US Polygon Helios A9X - Dura-Ace Di2 Carbon Road Bike Review
DB
19 Nov 2024
David B.
United States

POLYGON HELIOS A9X = WITHOUT QUESTION THE BEST ROAD BIKE I HAVE OWNED!!!

REVIEW AFTER 2 MONTHS OF OWNERSHIP PRO: >Incredible value - at least half the price of similar spec'd US national brands >Superb online experience - from - information, video and placing order >Excellent customer service - before and after the sale >Fast shipping >Securely packaged >Simple instructions - easy to follow, build, even for a novice bike rider. >Installation kit includes a simple torque wrench, assembly compound, and a Ritchey 7x9 carbon rail saddle clamp. >Pro level components - from FSA Vision bars (EF Education, Bahrain Victorious) to Shimano Dura Ace group set w/power meter >Excellent build quality >Great aero frame with potential to reduce weight by replacing wheels, tires and saddle *** >Excellent D shaped seat post >Well made - out front 2 position computer mount >Etched graphics not decals >Frame color - referred to by one Australian reviewer as "Oil Slick Gray" A comfortable fast, smooth shifting ride CONS: >Online sizing chart - bike frame size is larger than national brands. Use 99spokes.com to research your size >Saddle - wide, short >Bar tape very thin >Frame color - personal preference +++ >Same sizes are currently out of stock!! COMMENTS: >If you're uncertain about the length of the one piece handlebars consider the STRATTOS S8X >Numerous online reviewers mentioned the Shimano Bottom Bracket as being a weak point. Ignore that!! >Podcasters also made unflattering remarks about the Shimano 9200 power meter - I experienced no data issues, similar power readings when compared to my QuarQ DZero and Power2Max. >Crank length - 170mm (unexpected) significantly improved ride comfort - 170mm on A9X medium frame vs 175mm on my (56) S-Works Tarmac sl *** Weight - Under 17lbs without pedals. Replaced: Wheels - carbon 45mm rims/carbon spokes, Tires - Continental 5000 S TR 30mm tires/MilKit tubeless or TPU tubes (65mm) and Saddle - Posedla 3D printed saddle. +++ If you don't like the color buy the A8X - black PLACE YOUR NAME ON THE WAITING LIST NOW!! Reviewer: 35+ years road bike experience with 100s of 1000s of miles ridden on a dozen different bikes.