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Description

PERFORMANCE AERO

The Polygon Helios A7X is a UCI-approved carbon aero race bike weighing just 8.1kg, 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 A7X delivers the speed and agility you need to beat PRs and the competition.

LOOKS FAST, FEELS FASTER

The Helios A7X 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 warranty, you can trust Polygon to deliver from the factory to the track.

INDUSTRY REVIEWS

Incredible value, well-mannered ride, quick yet balanced handling, Shimano 105 Di2 group, did I mention the incredible value?” - Escape Collective

SHIMANO 105 Di2 GROUPSET

Lightning-fast electronic gear changes, a wider 2x12 drivetrain with 11-34T cassette, and versatile 52/36T chainrings make conquering any terrain a breeze. Enjoy pro-level performance at an accessible price.

CARBON WHEELS

Suited to undulating terrain, the Entity WR5 50mm carbon wheels offer a fast yet comfortable riding experience and come wrapped in Schwalbe ONE 28mm TLE/race-ready tyres.

INTEGRATED

The fully integrated BLKTEC R8 cockpit strikes the perfect balance between simplicity and aero engineering. It features a removable cover, making maintenance a breeze.

Components

FRAMESET
FRAME
ACX Performance UCI Approved, Internal Cable Routing, Shimano BB-RS500 Press Fit Bottom Bracket, 12x142mm Thru-Axle, Flat Mount Disc
SUSPENSION
FORK
ACX Performance UCI Approved, 12x100mm Thru-Axle, Flat Mount Disc
DRIVETRAIN
REAR DERAILLEUR
Shimano 105 Di2 RD-R7150, 12-Speed
FRONT DERAILLEUR
Shimano 105 Di2 RD-R7150, Braze-On
SHIFTER
Shimano 105 Di2 ST-R7170, 12-Speed
CRANK
Shimano 105 FC-7100, HollowTech 2, 12-Speed, XXS-M:170mm, L-XL:172.5mm
CHAINRING
52/36T
CASSETTE
Shimano 105 CS-R7100, 12-Speed, 11-34T
CHAIN
KMC X12, 12-Speed
BRAKES
FRONT BRAKE
Shimano 105 BR-R7170, Hydraulic Disc, 160mm Center Lock
REAR BRAKE
Shimano 105 BR-R7170, 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
TYRE
Schwalbe One Addix TLE, 700x28C
INNER TUBE
80mm Presta Valve
CONTACT POINTS
HANDLEBAR
BLKTEC R8 Integrated, 400mm Width (XXS-S), 420mm Width (M-XL)
SADDLE
Entity Flux2
SEATPOST
Polygon Carbon Aero Seatpost, 35x306mm (XXS), 337mm (XS), 357mm (S-XL), 20mm Adjustable Offset
STEM
BLKTR8 Integrated, 100mm Length (XXS-S), 110mm Length (M-L), 120mm Length (XL), 0-Degree
WEIGHT
BIKE WEIGHT
18lbs (Size L)

Specs are subject to change based on availability.

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

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Customer Reviews
4.9 Based on 16 Reviews
5 ★
94% 
15
4 ★
6% 
1
3 ★
0% 
0
2 ★
0% 
0
1 ★
0% 
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Customer Photos
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Filter Reviews:
  • Iowa
  • hills
  • Ultegra
  • handle bar tape
  • bike
  • version
  • 18,000
  • 2024
  • climb
  • problem
LI
27 Jun 2025
LJ I.
United States United States

An Amazing bike for the money

I bought this bike last year and took it on RAGBRAI 2024. One week with 446 miles and over 18,000 feet of climb. The only problem I had with the bike was the handle bar tape came undone. This bike is excellent and durable! It is a beautiful color and super fast. It made the Iowa steep rolling hills easy to navigate! You won’t regret buying this bike! I only wish I had the Ultegra version :) but honestly, these 105s are just fine.

BikesOnline US Polygon Helios A7X - 105 Di2 Carbon Road Bike Review
P
10 Jun 2025
Peter
Australia Australia

Space age race bike, built for speed - A new Helios

I had my first ride on the new Helios frame platform and was hugely impressed. I've ridden the old frame for a while and wasn't sure what the new one would feel like to ride with so many changes. Well, it is certainly an all-out race bike, taken straight from the pro's closet, so to speak. The geometry is low on the front, inspiring you to tuck into corners when descending and tuck out of the wind when on the flats. The new bars and wheels were a standout. The bars offer some really great options for changing positions and even offering you a big platform to rest your forearms on the tops to tuck into that aero position. Sprinting from the drops was also nice because they offer a great flat spot to get your hands inline with your arms and makes the front feel stable under power, when pulling through the front. The new Linc wheels had a nice freewheel sound, and I didn't notice them too much, which is a good thing, and they look great in the sun with their raw finish. I did set it up tubeless which gave it a really nice subtle feel too. The position on the Helios is now a proper race frame with a low front end and stiff drive section. Each pedal stroke went straight to the rear wheel and I could feel the road surface through the bike, which is what you want from such a race-inspired machine. I can imagine someone purchasing one of these and going straight to their local criterium track with only sticking a bit of air in the tyres.

BikesOnline US Polygon Helios A7X - 105 Di2 Carbon Road Bike ReviewBikesOnline US Polygon Helios A7X - 105 Di2 Carbon Road Bike ReviewBikesOnline US Polygon Helios A7X - 105 Di2 Carbon Road Bike ReviewBikesOnline US Polygon Helios A7X - 105 Di2 Carbon Road Bike Review
HB
09 May 2025
Harold B.
Australia Australia

Great Service

With Brad's help and multiple phone calls the right size bike was established including follow up emails. the personal attention was very much appreciated

A BikesOnline US Customer
BF
24 Apr 2025
Brendan F.
Australia Australia

Very Happy Customer

After searching for a second hand bike within limited budget for months, I gave in a went with a brand new option. This bike is such good value and the best option for people who need a decent road bike but are still fairly new to the sport.