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Polygon Helios A vs Winspace T1550
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 Polygon Helios A starts $200 cheaper ($3,999 vs $4,199 for the Winspace T1550).
- Our verdict scores the Polygon Helios A higher overall: 82/100 vs 78/100.
- Tire clearance: up to 34 mm on the Polygon Helios A vs 32 mm on the Winspace T1550.
- The Polygon Helios A comes in 7 sizes, the Winspace T1550 in 5.
Polygon Helios A
Winspace T1550
| PolygonHelios A | WinspaceT1550 | |
|---|---|---|
| Overview | ||
| Brand | Polygon | Winspace |
| Build | Helios A0 AXS | T1550 Gen2 Ultegra Di2 |
| Build notes | Sunset Rush paint. USD price from Polygon US. Polygon lists crank arms without lengths. Polygon's spec list names no front derailleur. | Winspace's weight is about 7.7 kg in size M without pedals. Sold in USD only; shipped from the China, EU or US warehouse, plus a $100 complete-bike shipping fee outside Asia. Bikes from the EU warehouse may come with an 11-30 cassette, Shimano SM-RT10 rotors, a Selle Italia Novus Boost saddle and 28 mm Michelin Power Cup tyres. Winspace says all cranksets currently ship with 52/36 chainrings. |
| Price (MSRP) | €8,999$8,999€8,999 | $4,849$4,849$4,849 |
| Bike weight | — | 7.7 kg17 lb |
| Weight measured on size | — | M |
| Model year | 2026 | 2026 |
| Generation | All-new Helios A (2025) | 2nd generation |
| Launched | 2025-06 | 2025-01 |
| Discipline | Aero road | Aero road |
| UCI legal | Yes | Yes |
| Verdict (out of 100) | ||
| Overall score | 82 | 78 |
| Aero | 78 | 80 |
| Frame | 78 | 74 |
| Components | 80 | 70 |
| Fit | 82 | 70 |
| Practicality | 82 | 72 |
| Price | 93 | 95 |
| Weight | — | 82 |
| Frame & fork | ||
| Frame material | Carbon (ACX, UCI approved) | Carbon (Toray T1000 and T800; the complete-bike pages list T800/T1000/M46) |
| Fork material | Carbon (ACX) | Carbon (Winspace T1550 fork) |
| Frame weight | 800 g28.2 oz | 828 g29.2 oz |
| Weight measured on | Polygon's claim; size and finish not stated | Frame, size M, unpainted (±35 g). The complete-bike pages give about 855 g for a painted size M frame. |
| Frame sizes | XXXS, XXS, XS, S, M, L, XL | XS (440), S (470), M (490), L (520), XL (550) |
| 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 | Flavoured Black, Retro Blue, Black and White, Silver and White, Panda, Silver Red, Vuelta Tribute, Turbulent Blue, Tropical Green, 2025 Team Edition, Black Viper, Chameleon White, Cosmic Purple, Carnival, Neon, Blue Silk, Stardust (frameset); complete bikes also list Clover |
| 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) | Winspace states the T1550 Gen 2 frameset is UCI approved. The UCI list (version 2026.10.02) has a 'T1550' frame and fork approved 27 Sep 2017 (sizes 410-550, code WINS-T15-RD) and no separate entry for the second generation. |
| Compatibility & standards | ||
| Brake type | Hydraulic disc | Disc, flat mount |
| Wheel size | 700c | 700c |
| Max tire width | 34 mm | 32 mm |
| Bottom bracket standard | T47 threaded (85.5 mm) | T47 threaded (internal, symmetric 85.5 mm) |
| Front axle | 12x100 thru-axle | 12x100 thru-axle |
| Rear axle | 12x142 thru-axle | 12x142 thru-axle |
| Drivetrain compatibility | — | Mechanical and electronic: Shimano Di2, SRAM eTap/AXS and Campagnolo EPS routing |
| Mechanical shifting possible | — | Yes |
| Front derailleur mount | — | Braze-on |
| Cable routing | Internal, routed through the semi-integrated LINC bar and stem | Fully internal through a 1.5 in ACR (Aerodynamic Cable Routing) headset |
| 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 carbon bar and stem (Winspace Zero SL) on the complete bikes; the frameset comes without a cockpit |
| Seatpost type | Aero carbon seatpost (35 mm aero, 351 mm) included; a standard 27.2 mm round post fits via an adapter | Proprietary carbon aero seatpost (Winspace S23 VCLS), 0 or 15 mm setback (0 mm on XS-S, 15 mm on M-XL in the geometry chart) |
| Fit notes | — | Five sizes. Compared with the first T1550 the head tubes are about 10 mm longer on average and the stack-to-reach ratio is 1.40 or more. The Zero SL one-piece cockpit is sold in 380, 400 and 420 mm widths with 85 to 135 mm stems ($290 on its own); the complete-bike pages don't say which size is fitted. |
| 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. | Winspace publishes no drag figures. It says the fully hidden ACR cable routing lowers drag. |
| Tube profile | Truncated airfoil down tube, seatpost and head tube | — |
| Travel, maintenance & warranty | ||
| Headset bearings | Integrated, IS52/28.6 top and IS52/40 bottom | 1.5 in (No.55R), ACR integrated headset included |
| Derailleur hanger | — | Direct-mount derailleur hanger (a spare comes with complete bikes) |
| Proprietary parts | Aero seatpost (a round 27.2 mm post can be used with an adapter) | Aero seatpost, ACR headset and Zero SL cockpit |
| Frame warranty | 5 years on carbon frames and on rigid forks, for the original registered owner (Polygon warranty terms) | 3 years on the frameset from arrival at the original buyer (wheelsets 2 years); not transferable |
| Sold via | Polygon dealers and Polygon's official online store | Direct online from Winspace (shipped from China, EU or US warehouses) and through authorized dealers |
| Drivetrain | ||
| Groupset | SRAM Red AXS E1 | Shimano Ultegra Di2 R8100 |
| Launched | 2024 · current generation | 2021 · current generation |
| Speeds | 12-speed | 12-speed |
| Electronic | Yes | Yes |
| Wireless | Yes | — |
| Drivetrain | 2x | 2x |
| Shifters | SRAM Red AXS E1 | Shimano Ultegra Di2 ST-R8170 |
| Crankset | SRAM Red AXS E1 Power Meter | Shimano Ultegra R8100 |
| Chainrings | 48/35 | 52/36 |
| Power meter | SRAM Red AXS E1 Power Meter | — |
| Launched | 2024 · current generation | — |
| Bottom bracket | SRAM DUB T47 | Token T47 |
| Standard | T47 (85.5 mm) | T47, 85.5 mm |
| Bearings | — | Steel |
| Front derailleur | — | Shimano Ultegra Di2 R8150 |
| Rear derailleur | SRAM Red AXS E1 | Shimano Ultegra Di2 R8150 |
| Cassette | SRAM Red XG-1290 E1 | Shimano Ultegra R8100 |
| Range | 10-33 | 11-34 |
| Speeds | 12-speed | 12-speed |
| Chain | SRAM Red E1 | Shimano CN-M8100 |
| Brakes | ||
| Brake levers | SRAM Red AXS E1 | — |
| Brake calipers | SRAM Red AXS E1 | Shimano Ultegra hydraulic disc |
| Type | Hydraulic disc | — |
| Rotors | SRAM Paceline X | Shimano RT-CL800 |
| Front rotor | 160 mm | 160 mm |
| Rear rotor | 140 mm | 140 mm |
| Mount | Center Lock | Center Lock |
| Wheels & tires | ||
| Wheelset | Zipp 303 SW | Lún Hyper 3 |
| Internal rim width | 25 mm | — |
| Material | Carbon | Carbon |
| 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 | Michelin Power Cup |
| Tire width | 30 mm | — |
| Cockpit | ||
| Handlebar | LINC Carbon handlebar | Winspace Zero SL |
| 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, 400 or 420 mm, with 85 to 135 mm stem (sold separately in these sizes; stock size not stated) |
| Cable routing | Internal (semi-integrated with the stem) | Fully internal through the ACR headset |
| Material | Carbon | 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 | — |
| Saddle & seatpost | ||
| Saddle | Fizik Vento Antares R3 | Selle Italia SLR Boost Superflow |
| Rails | Kium, 7 mm | — |
| Seatpost | Carbon aero seatpost | Winspace S23 VCLS |
| Offset / setback | — | 0 or 15 mm setback |
| Material | Carbon | Carbon |
| Notes | Aero 35 x 351 mm | — |
| Geometry (smallest – largest size) | ||
| Sizes | XXXS, XXS, XS, S, M, L, XL | XS, S, M, L, XL |
| Rider height min | 143–180 cm4′8″–5′11″ | 152–182 cm5–6′0″ |
| Rider height max | 153–187 cm5′0″–6′2″ | 165–192 cm5′5″–6′4″ |
| Stack | 493–571 mm19.4–22.5″ | 504.7–585.7 mm19.9–23.1″ |
| Reach | 370–420 mm14.6–16.5″ | 363–397 mm14.3–15.6″ |
| Seat tube angle | 73–75° | 73–75.1° |
| Head tube angle | 71–73° | 70.7–72.9° |
| Head tube length | 90–170 mm3.5–6.7″ | 105–180 mm4.1–7.1″ |
| Effective top tube | 502–598 mm19.8–23.5″ | 497.3–576.1 mm19.6–22.7″ |
| Seat tube length | 395–536 mm15.6–21.1″ | 440–550 mm17.3–21.7″ |
| Chainstay | 410 mm16.1″ | 408 mm16.1″ |
| Wheelbase | 969–1,024 mm38.1–40.3″ | 969.1–1,002.7 mm38.2–39.5″ |
| BB drop | 71.5–78 mm2.8–3.1″ | 72 mm2.8″ |
| BB height | 266–272.5 mm10.5–10.7″ | 271 mm10.7″ |
| Fork length | — | 370 mm14.6″ |
| Fork offset | — | 44–50 mm1.7–2″ |
| Trail | — | 57.7–65 mm2.3–2.6″ |
| Standover | 662–799 mm26.1–31.5″ | 731–832 mm28.8–32.8″ |
| Wheel size | 700c | 700c |
| Stem length | 90–120 mm3.5–4.7″ | — |
| Handlebar width | 400–440 mm15.7–17.3″ | — |
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).