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2025 Polygon

Helios A9X

A carbon frame race bike with ultra high-end components and shimano dura-ace hydraulic disc brakes.

Manufacturer Price

$6,249
FrameCarbon
ForkCarbon
Wheels700c
Drivetrain2 × 12 Electronic
GroupsetDura-Ace Di2
BrakesShimano Dura-Ace Hydraulic Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Rider Position
relaxedaggressive
Terrain
smoothrugged
Helios A9X
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 A9X

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.

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
In for review: Polygon Helios A – Is this a budget-friendly do-it-all race bike?

May 2025 · Alex Hunt

Polygon’s Helios A undercuts the big brands and claims to offer all-round race performance. Can it deliver on both price and ride?

Highs

  • Undercuts big brands on price

  • 34 mm tyre clearance for versatility

  • Ability to swap between proprietary aero seatpost and standard 27.2 mm round post

  • Potential for greater compliance and comfort with round seatpost

Lows

  • Brand seemingly unsure how to define the bike (race or endurance)

  • Frame geometry remains fixed, limiting transformation into a true endurance bike

Read Review

Geometry
Specs
Build
Frame

ACX Performance Carbon UCI Approved, Internal Cable Routing, Shimano KSMBB9241B Press Fit Bottom Bracket, 12x142mm Thru-Axle, Flat Mount Disc

BB Standard: BB86/BB92, Press Fit

Tire Clearance: 28c

Fork

ACX Performance Carbon UCI Approved, 12x100mm Thru-Axle, Flat Mount Disc

Bottom Bracket

BB86/BB92, press-fit

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, 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

Type: Rigid

Pedals

Not included

Groupset
Rear Derailleur

Shimano Dura-Ace Di2 RD-R9250, 12-Speed

Front Derailleur

Shimano Dura-Ace Di2 FD-R9250, Braze-On

Crank

52/36T

Shifters

Shimano Dura-Ace Di2 ST-R9270, 12-Speed

Cassette

Shimano Dura-Ace CS-R9250, 12-Speed, 11-34T

Chain

Shimano CN-M8100, 12-Speed

Brakes

Front: Shimano Dura-Ace BR-R9270, Hydraulic Disc, 160mm Center Lock, Rear: Shimano Dura-Ace BR-R9270, Hydraulic Disc, 140mm Center Lock

Type: Shimano Dura-Ace Hydraulic Disc

Wheels
Front Hub

Entity WR5 Carbon Disc, 769g, 21mm Internal Width, 50mm Depth, Entity D791SB-12 Hub, 24H, Stainless Straight Pull Butte Spokes, Tubeless Tape Installed / Shimano C60 Dura-Ace Carbon Disc, 751g, 21mm Internal Width, 60mm Depth, 24H, Tubeless Tape Installed

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

Tires

Schwalbe One Addix TLE, 700x28C, Tubeless Ready

Rider Notes
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First added August 31

Last updated February 14

Not listed for 107 days