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Polygon Helios A vs Storck Aerfast.4 Comp
Pick up to 4 bikes. Rows line up component by component. Highlighted rows differ, and green marks the best value where lower or higher is clearly better.
Key differences
- The Storck Aerfast.4 Comp starts €600 cheaper (€3,399 vs €3,999 for the Polygon Helios A).
- Our verdict scores the Polygon Helios A higher overall: 82/100 vs 72/100.
- Tire clearance: up to 34 mm on the Polygon Helios A vs 28 mm on the Storck Aerfast.4 Comp.
- The Polygon Helios A comes in 7 sizes, the Storck Aerfast.4 Comp in 6.
Polygon Helios A
Storck Aerfast.4 Comp
| PolygonHelios A | StorckAerfast.4 Comp | |
|---|---|---|
| Overview | ||
| Brand | Polygon | Storck |
| Build | Helios A0 AXS | Aerfast.4 Comp 105 (11-speed) |
| Build notes | Sunset Rush paint. USD price from Polygon US. Polygon lists crank arms without lengths. Polygon's spec list names no front derailleur. | Colour Matt Black; 11-speed Shimano 105 R7000 with DT Swiss PR 1600 Spline 32 alloy wheels. MSRP €3,399; Storck showed it reduced to €2,999 on 2 Nov 2026. Price from Storck's own web shop (EUR only). No power meter. |
| Price (MSRP) | €8,999$8,999€8,999 | €3,399€3,399€3,399 |
| Model year | 2026 | 2026 |
| Generation | All-new Helios A (2025) | Aerfast.4 (fourth generation) |
| Launched | 2025-06 | 2021 |
| Newer generation | — | Aerfast.5 (2024) |
| Discipline | Aero road | Aero road |
| UCI legal | Yes | Yes |
| Verdict (out of 100) | ||
| Overall score | 82 | 72 |
| Aero | 78 | 85 |
| Frame | 78 | 64 |
| Components | 80 | 58 |
| Fit | 82 | 72 |
| Practicality | 82 | 58 |
| Price | 93 | 97 |
| Frame & fork | ||
| Frame material | Carbon (ACX, UCI approved) | Carbon (CFR/UD), Comp grade |
| Fork material | Carbon (ACX) | — |
| Frame weight | 800 g28.2 oz | 950 g33.5 oz |
| Fork weight | — | 500 g17.6 oz |
| Frameset weight | — | 1,900 g4.19 lb |
| Weight measured on | Polygon's claim; size and finish not stated | Storck's 'from' weights on its Aerfast.4 Platinum and Pro frameset pages (frame, fork, one-piece cockpit; frameset includes seatpost and headset); not split by grade or size |
| Max system weight | — | 120 kg264.6 lb |
| Frame sizes | XXXS, XXS, XS, S, M, L, XL | XS, S, M, L, XL |
| Colours | Sunset Rush (A0 AXS), Velvet Ember / Candy (A9 Di2), Midnight Pine / Chrome Rocket (A8 Di2), Cosmic Plum / Black Phantom (A7 Di2); framesets also in Black Phantom, Candy, Chrome Rocket, Cosmic Plum, Midnight Pine, Sunset Rush and Velvet Ember | Matt Black |
| Also available as | — | Aerfast.4 Platinum, Pro, Comp and Red Edition (frame classes of the same design, same geometry); succeeded by the Aerfast.5 |
| UCI frame approval | Approved 17 Jan 2024 as 'HELIOS A GEN 3.0' (frame and fork), sizes 3XS - XL (7), code POLYGON-1 (UCI list version 2026.10.02) | On the UCI list of approved framesets as 'AERFAST.3 / AERFAST.4' (code STOR-AEF), approved 8 Feb 2023 in sizes XS-XXL (6) (UCI list version 2026.10.02); the list doesn't distinguish the grades |
| Compatibility & standards | ||
| Brake type | Hydraulic disc | Hydraulic disc, flat mount (160 mm rotors front and rear as built) |
| Wheel size | 700c | — |
| Max tire width | 34 mm | 28 mm |
| Bottom bracket standard | T47 threaded (85.5 mm) | Press-fit, 41 mm bearing bore x 86.5 mm |
| Front axle | 12x100 thru-axle | — |
| Rear axle | 12x142 thru-axle | — |
| Cable routing | Internal, routed through the semi-integrated LINC bar and stem | Internal through the one-piece cockpit |
| Hydration & storage | ||
| Bottle mount locations | Down tube with two cage positions: low for large bottles, high for smaller ones | — |
| Fit & adjustability | ||
| Cockpit | Two-piece: LINC carbon handlebar and separate carbon stem (31.8 mm clamp), hoses routed internally | One-piece Storck RBSU Aerfast.4 bar and stem, one size per frame size |
| Seatpost type | Aero carbon seatpost (35 mm aero, 351 mm) included; a standard 27.2 mm round post fits via an adapter | Storck Aerfast.4 carbon aero seatpost |
| Fit notes | — | Each frame size comes with one cockpit size, from 380 mm bar / 90 mm stem (XS) to 440 / 120 mm (XXL). Storck says a computer mount and triathlon extensions can be retrofitted, and lists its TT kit as compatible with the Aerfast.4. |
| Aerodynamics | ||
| Manufacturer aero claims | 5.2 seconds faster than the previous Helios A (Polygon; test distance and speed not stated). Polygon's pages also cite a 31% drag reduction versus previous generations. | Storck says the Aerfast.4 measured 199 W at 45 km/h in TOUR's wind-tunnel test; TOUR's own figures were 201 W for the Pro Disc and 202 W for the Comp Disc |
| Testing method | — | Wind tunnel |
| Tube profile | Truncated airfoil down tube, seatpost and head tube | 80 mm wide aero fork with a camtail trailing edge |
| Travel, maintenance & warranty | ||
| Headset bearings | Integrated, IS52/28.6 top and IS52/40 bottom | — |
| Proprietary parts | Aero seatpost (a round 27.2 mm post can be used with an adapter) | RBSU Aerfast.4 one-piece cockpit, Aerfast.4 seatpost and headset |
| Frame warranty | 5 years on carbon frames and on rigid forks, for the original registered owner (Polygon warranty terms) | — |
| Sold via | Polygon dealers and Polygon's official online store | Direct from Storck's web shop and Storck stores |
| Drivetrain | ||
| Groupset | SRAM Red AXS E1 | Shimano 105 R7000 |
| Launched | 2024 · current generation | 2018 · replaced by Shimano 105 R7100 (2023) |
| Speeds | 12-speed | 11-speed |
| Electronic | Yes | No |
| Wireless | Yes | — |
| Drivetrain | 2x | 2x |
| Shifters | SRAM Red AXS E1 | Shimano 105 R7000 |
| Notes | — | Mechanical shift and hydraulic brake levers |
| Crankset | SRAM Red AXS E1 Power Meter | Shimano 105 R7000 |
| Chainrings | 48/35 | 50/34 |
| Crank lengths available | — | 170 mm (XS-S), 172.5 mm (M-L), 175 mm (XL-XXL) |
| Power meter | SRAM Red AXS E1 Power Meter | — |
| Launched | 2024 · current generation | — |
| Bottom bracket | SRAM DUB T47 | Storck Press-fit 41 x 86.5 mm |
| Standard | T47 (85.5 mm) | Press-fit, 41 mm bearing bore x 86.5 mm |
| Rear derailleur | SRAM Red AXS E1 | Shimano 105 R7000 |
| Cassette | SRAM Red XG-1290 E1 | Shimano 105 R7000 |
| Range | 10-33 | 11-30 |
| Speeds | 12-speed | 11-speed |
| Chain | SRAM Red E1 | Shimano CN-HG601 |
| Brakes | ||
| Brake levers | SRAM Red AXS E1 | — |
| Brake calipers | SRAM Red AXS E1 | Shimano 105 |
| Type | Hydraulic disc | Hydraulic disc, flat mount |
| Notes | — | 160 mm rotors front and rear |
| Rotors | SRAM Paceline X | — |
| Front rotor | 160 mm | — |
| Rear rotor | 140 mm | — |
| Mount | Center Lock | — |
| Wheels & tires | ||
| Wheelset | Zipp 303 SW | DT Swiss PR 1600 Spline 32 |
| Front rim depth | — | 32 mm |
| Rear rim depth | — | 32 mm |
| Internal rim width | 25 mm | — |
| Material | Carbon | Aluminium |
| Tubeless ready | Yes | — |
| Hubs | Alloy, sealed bearings, Center Lock; 12x100 mm front, 12x142 mm rear, 20H front and rear | — |
| Spokes | Sapim CX-Sprint | — |
| Tires | Goodyear Vector R SW | Continental Grand Prix TR |
| Tire width | 30 mm | 25 mm |
| Cockpit | ||
| Handlebar | LINC Carbon handlebar | Storck RBSU Aerfast.4 |
| Type | Drop bar | One-piece bar and stem |
| Integrated stem | No | Yes |
| Widths available | 400 mm (XXXS, XXS, XS), 420 mm (S, M), 440 mm (L, XL) | 380 mm / 90 mm stem (XS), 400/100 (S), 420/100 (M-L), 420/110 (XL), 440/120 (XXL) |
| Cable routing | Internal (semi-integrated with the stem) | — |
| Material | Carbon | — |
| Notes | 31.8 mm clamp. Polygon lists 'R/D' -134.2 mm (XXXS-XS) / -138.2 mm (S-XL) and 'B/R' 92.5 mm (XXXS-XS) / 89.7 mm (S-XL). | — |
| Stem | LINC Carbon stem | — |
| Stem length | 90 mm (XXXS), 100 mm (XXS, XS), 110 mm (S, M), 120 mm (L, XL) | — |
| Notes | -7.5 degree, 31.8 mm bar clamp | — |
| Headset | Integrated sealed bearing, IS52/28.6 top, IS52/40 bottom | Storck Aerfast.4 integrated headset |
| Saddle & seatpost | ||
| Saddle | Fizik Vento Antares R3 | Selle San Marco Shortfit 2.0 |
| Rails | Kium, 7 mm | — |
| Seatpost | Carbon aero seatpost | Storck Aerfast.4 Carbon |
| Material | Carbon | Carbon |
| Notes | Aero 35 x 351 mm | — |
| Bar tape | — | Storck Microfibre |
| Notes | — | Black |
| Geometry (smallest – largest size) | ||
| Sizes | XXXS, XXS, XS, S, M, L, XL | XS, S, M, L, XL, XXL |
| Rider height min | 143–180 cm4′8″–5′11″ | 152–188 cm5′0″–6′2″ |
| Rider height max | 153–187 cm5′0″–6′2″ | 166–190 cm5′5″–6′3″ |
| Stack | 493–571 mm19.4–22.5″ | 482–576 mm19–22.7″ |
| Reach | 370–420 mm14.6–16.5″ | 362.5–418 mm14.3–16.5″ |
| Seat tube angle | 73–75° | 73° |
| Head tube angle | 71–73° | 70–72° |
| Head tube length | 90–170 mm3.5–6.7″ | 85–170 mm3.3–6.7″ |
| Effective top tube | 502–598 mm19.8–23.5″ | 510–595 mm20.1–23.4″ |
| Seat tube length | 395–536 mm15.6–21.1″ | 458–583 mm18–23″ |
| Chainstay | 410 mm16.1″ | 410 mm16.1″ |
| Wheelbase | 969–1,024 mm38.1–40.3″ | — |
| BB drop | 71.5–78 mm2.8–3.1″ | — |
| BB height | 266–272.5 mm10.5–10.7″ | — |
| Standover | 662–799 mm26.1–31.5″ | — |
| Wheel size | 700c | — |
| Crank length | — | 170–175 mm6.7–6.9″ |
| Stem length | 90–120 mm3.5–4.7″ | 90–120 mm3.5–4.7″ |
| Handlebar width | 400–440 mm15.7–17.3″ | 380–440 mm15–17.3″ |
Geometry overlay
Pick a size for each bike to see frames and arm-pad ranges on top of each other.
Drawn to scale (how to read it).