Polygon Helios A8

2025 RoadRace Manufacturer page

Last known price: $3,299

Prices shown first for United States
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 11 36–52t / 11–34t
Gear range: 446%
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XXS 151–161
XS 154–164
SM 162–170
MD 168–176
LG 174–182
XL 179–187

Components

14 of 22 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

carbon Not identified

Suspension

1 part

Fork

ACX PERFORMANCE UCI APPROVED, TAPER 1-1/8" TO 1-1/2" Not identified

Drivetrain

7 parts

Bottom bracket
- Shimano BB-RS500-PB
BB-RS500-PB
Cassette
- Shimano Ultegra CS-R8000 11 speeds 11–34t
CS-R8000CS-R8000-11
Chain
- Shimano CN-HG601-11
CN-HG601-11
Crankset
- Shimano Ultegra FC-R8000 52/36t
FC-R8000
Front derailleur
- Shimano Ultegra FD-R8150 2 speeds
FD-R8150
Rear derailleur
- Shimano Ultegra RD-R8000-GS 11 speeds
RD-R8000-GS
Shifters
- Shimano Ultegra ST-R8020
ST-R8020

Brakes

3 parts

Wheels and tires

4 parts

Front hub

ALLOY THRU AXLE 12x100mm 24H SEALED BEARINGS CENTER LOCK Not identified
Rear hub

ALLOY THRU AXLE 12x142mm 24H SEALED BEARINGS CENTER LOCK Not identified
Rims

CARBON 622-19 24H FOR TYRE 622-28/62 DISC TUBELESS READY Not identified
Tires
- Schwalbe One

Cockpit and contact points

7 parts

Grips

Performance Road Bar Tape (Black) Not identified
Handlebar
- FSA Energy
Headset

INTEGRATED (IS) SEALED BEARING FOR OS HEAD TUBE, IS 52/28.6 | IS 52/40 Not identified
Pedals

None
Saddle
- Entity
Seatpost

CARBON, AERO 35 x 337mm (XS) / 357mm (S, M, L, XL) Not identified
Stem
- Polygon

Sizes and geometry

6 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size SM

Table

Reach 380mm

Stack 535mm

Wheelbase 984mm

Head angle 72.0°

Seat angle 74.3°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	370	375	380	385	390	395
Stackmm	505	520.21	535.2	550.4	564.7	580.8
Top tube lengthmm	505.31	517.31	530.42	543.04	555.14	569.25
Seat tube lengthmm	450	475	500	520	545	570
Head tube lengthmm	100	115	130	145	160	175
Head tube angle	71.5°	71.8°	72°	72.3°	72.3°	72.8°
Seat tube angle	75°	74.7°	74.3°	74°	73.7°	73.3°
Chainstay lengthmm	415	415	415	415	415	415
Wheelbasemm	968.42	975.82	983.9	991.1	1000.62	1005.8
Front centermm	565	572	580	587	597	602
Bottom bracket dropmm	73	73	73	73	73	73
Bottom bracket heightmm	271	271	271	271	271	271
Standover heightmm	715.04	739.4	763.21	780.8	802.52	824.28
Fork rakemm	43	43	43	43	43	43
Trailmm	67	65	64	62	62	59
Stack/reach ratio	1.37	1.39	1.41	1.43	1.45	1.47
Suspension and parts
Crank lengthmm	165	165	170	170	172.5	175
Handlebar widthmm	400	400	420	420	440	440
Stem lengthmm	100	100	110	110	120	120

Not published by the manufacturer: Front travel, Rear travel, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Carbon
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 36
Largest chainring: 52
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 30.7 in
Highest gear: 137.1 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Derailleur hanger: UDH
Seatpost: Rigid seatpost
Shifting: Electronic

Additional specifications

Bottom bracket standard: BB86/BB92
Tire clearance: Maximum tire width: 34c; Additional specification: Wheel kind: 700
Tire width: 28c
Wheel material: Carbon
Wheel size: 700c

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

30.7 gear inches

This value is within the central range for this class.

Cohort: Road / Race Model year: 2025
Sample: 762 bicycles with this information
Coverage: 78.1% of the class

Highest gear

137.1 gear inches

This value is within the central range for this class.

Cohort: Road / Race Model year: 2025
Sample: 762 bicycles with this information
Coverage: 78.1% of the class

Shifting

Electronic

643 of 969 bicycles with this information use electronic shifting.

Cohort: Road / Race Model year: 2025
Sample: 969 bicycles with this information
Coverage: 99.3% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.8 km/h
Highest gear: 52.5 km/h

Total gear range 446%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 30.7–137.1 gear inches
Class reference (p10–p90): 28.2–139.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Race Model year: 2025
Lowest gear: 762 bicycles with this information, 78.1% of the class
Highest gear: 762 bicycles with this information, 78.1% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2025 builds
Specification	This bicycle Polygon Helios A8	Polygon Helios A0	Polygon Helios A0 AXS	Polygon Helios A7	Polygon Helios A7 Di2	Polygon Helios A7X
Frame
Bicycle weight	Not informed	Not informed	Not informed	9.1 kg	Not informed	Not informed
Drivetrain
Smallest chainring	36	35	35	36	36	34
Largest chainring	52	48	48	52	52	50
Rear sprockets	11	12	12	11	12	12
Smallest sprocket	11	10	10	11	11	11
Largest sprocket	34	33	33	30	34	34
Lowest gear	30.7 in	30.8 in	30.8 in	34.8 in	30.7 in	29.0 in
Highest gear	137.1 in	139.2 in	139.2 in	137.1 in	137.1 in	131.8 in
Cockpit
Derailleur hanger	UDH	UDH	Not informed	UDH	Not informed	Not informed
Other specifications
Bottom bracket standard	BB86/BB92	Not informed	T47	BB86/BB92	T47	BSA
Tire clearance	Maximum tire width: 34c; Additional specification: Wheel kind: 700	Maximum tire width: 34c; Additional specification: Wheel kind: 700	Not informed	Maximum tire width: 34c; Additional specification: Wheel kind: 700	Not informed	Not informed
Tire width	28c	30c	30c	28c	28c	28c
Power meter	Not informed	Not informed	SRAM RED E1 48/35T POWER METERAdditional specification: Model display: Red AXSAdditional specification: Model id: red-axs	Not informed	Not informed	Not informed