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Stevens Arcalis 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
- Our verdict scores the Stevens Arcalis higher overall: 80/100 vs 78/100.
- Tire clearance: up to 30 mm on the Stevens Arcalis vs 32 mm on the Winspace T1550.
- The Stevens Arcalis comes in 6 sizes, the Winspace T1550 in 5.
Stevens Arcalis
Winspace T1550
| StevensArcalis | WinspaceT1550 | |
|---|---|---|
| Overview | ||
| Brand | Stevens | Winspace |
| Build | Arcalis Shimano 105 | T1550 Gen2 Ultegra Di2 |
| Build notes | Base price for this groupset in Stevens' custom configurator (Germany, EUR), as listed on the Arcalis page; wheels, cockpit, tyres, saddle, crank length, colour and many other parts are chosen when ordering and some options cost extra. Base wheelset DT Swiss E 1800 alloy. | 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) | €3,899€3,899€3,899 | $4,849$4,849$4,849 |
| Bike weight | — | 7.7 kg17 lb |
| Weight measured on size | — | M |
| Model year | 2027 | 2026 |
| Generation | Aero Arcalis launched in 2021, with a lighter frame since the 2024 model | 2nd generation |
| Launched | 2024 | 2025-01 |
| Discipline | Aero road | Aero road |
| UCI legal | Not stated | Yes |
| Verdict (out of 100) | ||
| Overall score | 80 | 78 |
| Aero | 80 | 80 |
| Frame | 80 | 74 |
| Components | 62 | 70 |
| Fit | 90 | 70 |
| Practicality | 74 | 72 |
| Price | 94 | 95 |
| Weight | — | 82 |
| Frame & fork | ||
| Frame material | Carbon ('Carbon SL Fiber') | Carbon (Toray T1000 and T800; the complete-bike pages list T800/T1000/M46) |
| Fork material | STEVENS Full Carbon SL, carbon steerer | Carbon (Winspace T1550 fork) |
| Frame weight | 950 g33.5 oz | 828 g29.2 oz |
| Fork weight | 462 g16.3 oz | — |
| Weight measured on | Stevens' claims ('about 950 g' frame); size not stated | Frame, size M, unpainted (±35 g). The complete-bike pages give about 855 g for a painted size M frame. |
| Max system weight | 115 kg253.5 lb | — |
| Frame sizes | 48, 51, 54, 56, 58, 61 cm | XS (440), S (470), M (490), L (520), XL (550) |
| Colours | Dusty Lavender, Twilight Darks, White Petrol, Black Illusion | 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 | On the UCI list of approved framesets as 'ARCALIS' (code STEV-ARC), approved 16 Apr 2021 in sizes 48-58 (6) (UCI list version 2026.10.02); Stevens now sells sizes 48-61, and the list doesn't say whether the lighter 2024 frame is a separate approval | 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 | 30 mm | 32 mm |
| Bottom bracket standard | — | T47 threaded (internal, symmetric 85.5 mm) |
| Front axle | 12 mm thru-axle | 12x100 thru-axle |
| Rear axle | 12 mm thru-axle | 12x142 thru-axle |
| Drivetrain compatibility | Shimano 105, 105 Di2, Ultegra Di2 and Dura-Ace Di2 and SRAM Rival, Force and Red AXS E1, all 2x12, in the configurator; the frame kit comes with parts for mechanical, electronic or wireless groupsets | Mechanical and electronic: Shimano Di2, SRAM eTap/AXS and Campagnolo EPS routing |
| Mechanical shifting possible | Yes | Yes |
| Front derailleur mount | — | Braze-on |
| Cable routing | Fully internal with integrated cockpits; semi-integrated routing also selectable | Fully internal through a 1.5 in ACR (Aerodynamic Cable Routing) headset |
| Fit & adjustability | ||
| Cockpit | Chosen in the configurator: two-piece FSA or Deda stem and 31.8 mm bar sets, or one-piece Deda Alanera RS or FSA Vision Metron 5D ACR EVO carbon bar-stems (extra cost) | One-piece carbon bar and stem (Winspace Zero SL) on the complete bikes; the frameset comes without a cockpit |
| Standard stem and bar possible | Yes | — |
| Seatpost type | Arcalis carbon aero seatpost, 0 or 20 mm offset | 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 | Stem lengths 70-130 mm and bar widths 38-44 cm depending on the cockpit chosen; one-piece options come in fixed stem-length and width pairs. Spacers can be chosen when ordering. Crank lengths 165-175 mm on most groupsets. | 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 | Stevens cites TOUR's 2021 wind-tunnel result of 207 W at 45 km/h | Winspace publishes no drag figures. It says the fully hidden ACR cable routing lowers drag. |
| Testing method | Wind tunnel | — |
| Travel, maintenance & warranty | ||
| Headset bearings | — | 1.5 in (No.55R), ACR integrated headset included |
| Derailleur hanger | — | Direct-mount derailleur hanger (a spare comes with complete bikes) |
| Maintenance | Shimano builds can be ordered with 160/160 or 160/140 mm rotors; Stevens recommends 160/140 only for light riders on flat terrain. Trailers, racks and child seats are not permitted. | — |
| Proprietary parts | — | Aero seatpost, ACR headset and Zero SL cockpit |
| Frame warranty | — | 3 years on the frameset from arrival at the original buyer (wheelsets 2 years); not transferable |
| Sold via | Custom-built to order via Stevens' online configurator and Stevens dealers | Direct online from Winspace (shipped from China, EU or US warehouses) and through authorized dealers |
| Drivetrain | ||
| Groupset | Shimano 105 | Shimano Ultegra Di2 R8100 |
| Launched | — | 2021 · current generation |
| Speeds | 12-speed | 12-speed |
| Electronic | No | Yes |
| Drivetrain | 2x | 2x |
| Shifters | — | Shimano Ultegra Di2 ST-R8170 |
| Crankset | Shimano 105 | Shimano Ultegra R8100 |
| Chainrings | 50/34 | 52/36 |
| Crank lengths available | 165, 170, 172.5 or 175 mm | — |
| Bottom bracket | — | Token T47 |
| Standard | — | T47, 85.5 mm |
| Bearings | — | Steel |
| Front derailleur | — | Shimano Ultegra Di2 R8150 |
| Rear derailleur | — | Shimano Ultegra Di2 R8150 |
| Cassette | Shimano 105 R7101 | Shimano Ultegra R8100 |
| Range | 11-34 | 11-34 |
| Speeds | 12-speed | 12-speed |
| Chain | — | Shimano CN-M8100 |
| Brakes | ||
| Brake calipers | — | Shimano Ultegra hydraulic disc |
| Rotors | Shimano SM-RT70 | Shimano RT-CL800 |
| Front rotor | 160 mm | 160 mm |
| Rear rotor | 160 mm | 140 mm |
| Mount | — | Center Lock |
| Wheels & tires | ||
| Wheelset | DT Swiss E 1800 Spline 20 DB | Lún Hyper 3 |
| Material | Aluminium | Carbon |
| Tubeless ready | Yes | — |
| Weight | 1,650 g3.64 lb | — |
| Notes | Center Lock | — |
| Tires | — | Michelin Power Cup |
| Cockpit | ||
| Handlebar | — | Winspace Zero SL |
| Type | — | One-piece bar and stem |
| Integrated stem | — | Yes |
| Widths available | — | 380, 400 or 420 mm, with 85 to 135 mm stem (sold separately in these sizes; stock size not stated) |
| Cable routing | — | Fully internal through the ACR headset |
| Material | — | Carbon |
| Saddle & seatpost | ||
| Saddle | — | Selle Italia SLR Boost Superflow |
| Seatpost | Stevens Arcalis Carbon | Winspace S23 VCLS |
| Offset / setback | 0 mm (20 mm optional) | 0 or 15 mm setback |
| Material | Carbon | Carbon |
| Notes | 330 mm, 400 mm optional | — |
| Geometry (smallest – largest size) | ||
| Sizes | 48, 51, 54, 56, 58, 61 | XS, S, M, L, XL |
| Rider height min | — | 152–182 cm5–6′0″ |
| Rider height max | — | 165–192 cm5′5″–6′4″ |
| Stack | 491–594 mm19.3–23.4″ | 504.7–585.7 mm19.9–23.1″ |
| Reach | 378–411 mm14.9–16.2″ | 363–397 mm14.3–15.6″ |
| Seat tube angle | 73–75.5° | 73–75.1° |
| Head tube angle | 71.8–74° | 70.7–72.9° |
| Head tube length | — | 105–180 mm4.1–7.1″ |
| Effective top tube | 496–581 mm19.5–22.9″ | 497.3–576.1 mm19.6–22.7″ |
| Seat tube length | 471–576 mm18.5–22.7″ | 440–550 mm17.3–21.7″ |
| Chainstay | 415 mm16.3″ | 408 mm16.1″ |
| Wheelbase | 971–1,018 mm38.2–40.1″ | 969.1–1,002.7 mm38.2–39.5″ |
| BB drop | 70 mm2.8″ | 72 mm2.8″ |
| BB height | 272 mm10.7″ | 271 mm10.7″ |
| Fork length | 371 mm14.6″ | 370 mm14.6″ |
| Fork offset | 45 mm1.8″ | 44–50 mm1.7–2″ |
| Trail | — | 57.7–65 mm2.3–2.6″ |
| Front centre | 567–613 mm22.3–24.1″ | — |
| Standover | 746–846 mm29.4–33.3″ | 731–832 mm28.8–32.8″ |
| Wheel size | — | 700c |
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).