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2024 Polygon

HELIOS A7X

A carbon frame race bike with upper mid-range components and shimano 105 hydraulic disc brakes.
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Manufacturer Price

$3,999
Price History
Weight17.9 lbs  
FrameCarbon
ForkCarbon
Wheels700c Carbon
Drivetrain2 × 12 Electronic
Groupset105 Di2
BrakesShimano 105 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 A7X
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)

39 mph

HELIOS A7X

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: BSA, 68mm, Threaded

Color: Cameleon Purple

Fork

ACX PERFORMANCE UCI APPROVED

Bottom Bracket

SHIMANO BB-RS500 PRESSFIT 86

Headset

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

Stem

BLKTR8 Integrated, 100mm Length (XXS-S), 110mm Length (M-L), 120mm Length (XL), 0-Degree

Handlebar

BLKTEC R8 INTEGRATED, W: 400mm (XXS, XS, S) / 420mm (M, L, XL), BB: INTEGRATED, R/D: 0, B: 0

Saddle

ENTITY FLUX2, CR-MO ø 7mm

Seatpost

CARBON, AERO 35 x 306mm (XXS) / 337mm (XS) / 357mm (S, M, L, XL)

Type: Rigid

Pedals

Not Included

Groupset
Rear Derailleur

SHIMANO 105 Di2 RD-R7150

Front Derailleur

Shimano 105 Di2 RD-R7150, Braze-On

Crank

SHIMANO FC-R7100, 50/34T CRANK ARM 170MM (XXS, XS, S, M) / 172.5MM (L, XL)

Shifters

SHIMANO 105 Di2 ST-R7170, 2x12 SPEED BRIFTER

Cassette

SHIMANO 105 CS-R7100-12 11-34T

Chain

KMC X12

Brakes

SHIMANO 105 BR-R7170

Type: Shimano 105 Hydraulic Disc

Brake Levers

SHIMANO 105 ST-R7170

Wheels
Rims

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

Spokes

F: STAINLESS STRAIGHT PULL BUTTED F: NDS:264mm DS:266mm / R: NDS:266mm DS:263mm

Front Hub

F: ALLOY 12x100mm 24H SEALED BEARINGS CL / R; ALLOY 12x142mm 24H SEALED BEARINGS CL

Rear Hub

F: ALLOY 12x100mm 24H SEALED BEARINGS CL / R; ALLOY 12x142mm 24H SEALED BEARINGS CL

Tires

SCHWALBE ONE ADDIX TLE 700x28C

Disc Rotors

SHIMANO SM-RT70 F:160mm / R:140mm CL

Rider Notes
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First added September 18

Last updated May 30