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2024 Polygon

HELIOS A8X

A carbon frame race bike with high-end components and shimano ultegra hydraulic disc brakes.
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Manufacturer Price

$4,699
Price History
Weight1.7 lbs (frame)  
FrameCarbon
ForkCarbon
Wheels700c Carbon
Drivetrain2 × 12 Electronic
GroupsetUltegra, Ultegra Di2
BrakesShimano Ultegra Hydraulic Disc
View on polygonbikes.comLearn about Polygon
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Insights
Ride Feel

Based on frame geometry and build specs.

Rider Position
relaxedaggressive
Terrain
smoothrugged
HELIOS A8X
Other Race bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

41 mph

HELIOS A8X

40 mph

Similar Bikes

Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Sizing
XXS

4'11" – 5'4"

XS

5'0" – 5'5"

SM

5'3" – 5'7"

MD

5'6" – 5'10"

LG

5'8" – 6'0"

XL

5'10" – 6'2"

Rider Fit Notes
  • 6'1", size XL, Just right
View details
Price History
Reviews
Velo
First Ride: The Polygon Helios A Refines the Attainably-Priced Aero Road Bike Formula

Jun 2025 · Alvin Holbrook

The upated Polygon Helios A road bike cuts 150 grams, adds SRAM UDH and a threaded bottom, and an aim toward improved livability.

Read Review

Escape Collective
2024 Polygon Helios A7X road bike review: Aero on a budget - Escape Collective

Oct 2023 · Dave Rome

An incredibly well-priced performance-orientated aero road bike sold directly to consumers.

Highs

  • Incredible value

  • Well-mannered ride

  • Quick yet balanced handling

  • Shimano 105 Di2 group

  • Did I mention the incredible value?

Lows

  • Long reach isn’t for all

  • Adjusting stem height is tricky

  • Bars are real wide for an aero bike

  • No affordable option to change the handlebar

  • Tight tyre fit on rims

  • Out-of-box build could use a mechanic

  • Bartape.

Read Review

Geometry
Specs
Build
Frame

carbon

BB Standard: BB86/BB92, Press Fit

Color: Jet Black

Fork

ACX PERFORMANCE UCI APPROVED, TAPER 1-1/8" TO 1-1/2"

Shock

-

Bottom Bracket

SHIMANO SM-BB92-41B, PRESSFIT BB86

Headset

INTEGRATED (IS) SEALED BEARING FOR OS HEAD TUBE, IS 52/28.6 | IS 52/40

Stem

Vision Metron 5D ACR Integrated, 100mm Length (XS-S), 110mm Length (M-L), 120mm Length (XL), 6-Degree

Handlebar

VISION METRON 5D ACR INTEGRATED, W: 400mm (XS, S) / 420mm (M, L) / 420mm (XL), BB: INTEGRATED, R/D: 125mm, B/R: 80mm

Saddle

ENTITY FLUX2, CR-MO ø 7mm

Seatpost

CARBON, AERO 35 x 337mm (XS) / 357mm (S, M, L, XL)

Type: Rigid

Pedals

-

Groupset
Rear Derailleur

SHIMANO ULTEGRA Di2 RD-R8150 DIRECT ATTACH

Front Derailleur

Shimano Ultegra Di2 FD-R8150, Braze-On

Crank

SHIMANO ULTEGRA FC-R8100 52/36T, CRANK ARM: 170mm (XS, S, M) / 172.5mm (L, XL)

Shifters

SHIMANO ULTEGRA Di2 ST-R8170, 2x12-SPEED DCL

Cassette

SHIMANO ULTEGRA CS-R8100-12 11-34T

Chain

12-SPEED CHAIN

Brakes

SHIMANO ULTEGRA HYDRAULIC DISC

Type: Shimano Ultegra Hydraulic Disc

Brake Levers

SHIMANO ULTEGRA HYDRAULIC DISC

Wheels
Rims

CARBON 622-19 24H FOR TYRE 622-28/62 DISC TUBELESS READY

Spokes

STAINLESS STRAIGHT PULL BUTTE

Front Hub

ALLOY THRU AXLE 12x100mm 24H SEALED BEARINGS CENTER LOCK

Rear Hub

ALLOY THRU AXLE 12x142mm 24H SEALED BEARINGS CENTER LOCK

Tires

SCHWALBE ONE ADDIX TLE 700x28C

Disc Rotors

SHIMANO ULTEGRA HYDRAULIC DISC

Rider Notes
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First added September 18

Last updated May 30