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Storck Aerfast.5 vs Wilier Triestina Filante SLR ID2
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.5 starts €1 cheaper (€8,499 vs €8,500 for the Wilier Triestina Filante SLR ID2).
- Our verdict scores the Wilier Triestina Filante SLR ID2 higher overall: 82/100 vs 77/100.
- Tire clearance: up to 30 mm on the Storck Aerfast.5 vs 34 mm on the Wilier Triestina Filante SLR ID2.
Storck Aerfast.5
Wilier Triestina Filante SLR ID2
| StorckAerfast.5 | Wilier TriestinaFilante SLR ID2 | |
|---|---|---|
| Overview | ||
| Brand | Storck | Wilier Triestina |
| Build | Aerfast.5 Team Ultegra Di2 | Filante SLR ID2 SRAM Red AXS E1 Power Meter, Miche Deva RD 52 |
| Build notes | Colour Blue Faded. Price with Storck Zeitjaeger Platinum wheels; DT Swiss ARC 1100 Dicut 55 or 65 mm wheels add EUR 400 and DT Swiss WTS ARC 1100 Dicut 65 mm EUR 550 (EUR 8,899 / 9,049). Prices from Storck's own web shop (EUR only); same price in every size checked. No power meter. | Wilier code E766TBD5. Claimed weight 7,3 kg +/- 5%; Wilier doesn't state the size. Premium Paint colours (Dewlight Green, Firelight Red, Aurora Blue) cost €800 more in Europe; Wilier USA charges $960 more for Firelight Red, Aurora Blue and Solar Bronze. Prices are for the standard colours. |
| Price (MSRP) | €8,499€8,499€8,499 | €13,900$16,250€13,900 |
| Bike weight | — | 7.3 kg16.1 lb |
| Model year | 2026 | 2026 |
| Generation | Aerfast.5 (fifth generation), Team grade | Filante SLR ID2 (second generation) |
| Launched | 2024-03 | 2025-10 |
| Discipline | Aero road | Aero road |
| UCI legal | Yes | Yes |
| Verdict (out of 100) | ||
| Overall score | 77 | 82 |
| Aero | 94 | 93 |
| Frame | 88 | 88 |
| Components | 84 | 90 |
| Fit | 72 | 84 |
| Practicality | 60 | 64 |
| Price | 63 | 63 |
| Weight | — | 90 |
| Frame & fork | ||
| Frame material | Carbon (CFR/UD), Team grade | Carbon monocoque (HUS-MOD with liquid crystal polymer; Toray T800, T1100 and M46JB fibres) |
| Fork material | — | Carbon monocoque (HUS-MOD with liquid crystal polymer), NACA-profile legs with a fin around the front caliper |
| Frame weight | 890 g31.4 oz | 860 g30.3 oz |
| Fork weight | — | 380 g13.4 oz |
| Frameset weight | 1,600 g3.53 lb | — |
| Weight measured on | Frame weight is Storck's claim (size not stated on its site; road.cc reports it for the smallest size). Frameset weight is 'from 1,600 g' per Storck's frameset page and includes fork, one-piece cockpit, seatpost and headset; Storck quotes the same figure for the Pro frameset. | Size M; the frame is 860 g +/- 2% and the fork 380 g +/- 5%. Wilier's comparison table says painted black, its FAQ says ready-to-paint (RTP) finish. The painted F-Bar ID2 (110 mm, 37/40 cm) adds 340 g and the painted seatpost 100 g. |
| Frame sizes | XS, S, M, L, XL, XXL | XS, S, M, L, XL, XXL |
| Colours | Blue Faded | Pure White (glossy or matt), Eclipse Black (glossy), Lunar Grey (glossy or matt), Solar Bronze (glossy or matt), Dewlight Green, Firelight Red and Aurora Blue (glossy, Premium Paint) |
| Also available as | Aerfast.5 Pro (lower carbon grade, from EUR 5,999), limited 30th and 60th Edition models, and Aerfast.5 Team T / Pro T triathlon versions; the previous Aerfast.4 is still sold | Filante SL ID2 (lower-grade frame, separate model); Filante Ultimate (120th-anniversary edition) |
| UCI frame approval | On the UCI list of approved framesets as 'AERFAST.5' (code STORCK-AEF5), approved 11 Jan 2025 in sizes XS-XXL (6) (UCI list version 2026.10.02); the list doesn't distinguish the Team and Pro grades | On the UCI list of approved framesets as FILANTE SLR, category ALL, sizes XS-XXL (6), approved 12 May 2025, code WILIER-023 (the first Filante SLR is listed separately as FILANTE, approved 2020) |
| Compatibility & standards | ||
| Brake type | Hydraulic disc, flat mount (160 mm rotors front and rear as built) | Hydraulic disc |
| Wheel size | — | 700c |
| Max tire width | 30 mm | 34 mm |
| Bottom bracket standard | Press-fit, 41 mm bearing bore x 86.5 mm | PressFit 86.5 |
| Front axle | — | 12 mm thru-axle (Miche, 119.5 mm long), with the axle bushing hidden inside the right fork leg |
| Rear axle | 12 x 142 mm thru-axle | 12 mm thru-axle (Miche, 166.5 mm long) |
| Drivetrain compatibility | — | Electronic groupsets, 1x and 2x: built with Shimano Dura-Ace Di2 and Ultegra Di2, SRAM Red AXS E1, Red XPLR AXS E1 and Force AXS E1, and Campagnolo Super Record 13 |
| 1x compatible | — | Yes |
| Max chainring | — | 55T |
| Front derailleur mount | — | Removable derailleur mount; taken off for 1x (chainrings up to 55 teeth) |
| Cable routing | Internal through the one-piece cockpit | Fully internal, from the bar into the head tube through the Superfino upper bearing |
| Electronic battery location | — | In a resin housing at the bottom bracket, held by two screws (reachable without removing the seatpost) |
| Hydration & storage | ||
| Bottle mounts | — | 2 |
| Bottle mount locations | — | Down tube and seat tube, with Elite Aerokit bases; round bottles fit (up to 550 ml on the down tube and 750 ml on the seat tube) |
| Fit & adjustability | ||
| Cockpit | One-piece Storck RBSU Aerfast.5 bar and stem, one size per frame size | One-piece bar and stem (Wilier F-Bar ID2) |
| Clip-on aerobars possible | Yes | — |
| Seatpost type | Storck Aerfast.5 carbon aero seatpost | Wilier Filante ID2 carbon aero seatpost (38 x 16 mm), 0 mm offset as standard, 15 mm setback version as a spare part |
| Fit notes | Each frame size comes with one cockpit size, from 380 mm bar / 90 mm stem (XS) to 440 / 120 mm (XXL). Storck sells a Deda TT314 clip-on adapter for the Aerfast.5 cockpit (EUR 220) and a TT kit (EUR 899) that replaces the drop bar with a 380 mm base bar and extensions. | Wilier's AccuFit system: six frame sizes, seven handlebar width combinations, five stem lengths and two seatposts give 420 fitting positions about 2 mm apart. The F-Bar ID2 has 68 mm reach and 124 mm drop in every size and flares 3 cm from hoods to drops. Wilier says V-Bar, Z-Bar and F-Bar ID1 bars also fit, and with Wilier's adapters all of its other carbon and aluminium handlebars. |
| Aerodynamics | ||
| Manufacturer aero claims | 195 W at 45 km/h, measured by GST (Gesellschaft für Strömungsmesstechnik) to TOUR's wind-tunnel protocol, without bottle cage and with a 120 x 360 mm cockpit | Bike alone 13.6% less drag than the Filante SLR ID1 in the Silverstone wind tunnel (CdA 0.0883 vs 0.1016 m² at 50 km/h, 0° yaw); with rider 0.3284 vs 0.3465 m² (-5.2%) at 0° and 0.3564 vs 0.3753 m² at 15°. With the Aerokit it saves 14.15 W at 40 km/h and 28.8 W at 50 km/h with rider, about 1 min 45 s over 70 km at 290 W. Wilier says its average CdA was 2.42% better than five rival WorldTour bikes. |
| Testing method | Wind tunnel | CFD (about three times as many simulations as for the Supersonica SLR), then wind tunnel tests at Silverstone of the bike alone and with a rider |
| Tube profile | 80 mm wide aero fork; new seat tube, seatpost and aero seat stays | NACA-profile fork legs with a flat inner side; slim tapered head tube; two-part down tube (thin NACA top section, wider lower section shielding the bottles); seatstays angled 2.5° inward |
| Travel, maintenance & warranty | ||
| Headset bearings | — | Wilier Superslim 1-1/4" upper bearing (proprietary, from authorised dealers only) and FSA MR137 1-1/4" lower, with compression ring and concave top cover and spacers |
| Derailleur hanger | Storck hanger shared with the Aerfast.3 and Aerfast.4 (listed for the non-UDH Aerfast.5), EUR 49 | UDH (SRAM Universal Derailleur Hanger) |
| Maintenance | — | The Di2 battery sits behind a two-screw cover at the bottom bracket. A recess in the drive-side chainstay holds a power meter magnet under a flush sticker. Wilier recommends washing with mild soap and no compressed air. |
| Proprietary parts | RBSU Aerfast.5 one-piece cockpit, Aerfast.5 seatpost and headset, derailleur hanger | F-Bar ID2 cockpit with its top cover, top cap and concave spacers, Superslim upper bearing, Filante ID2 seatpost, Aerokit bases and cages |
| Frame warranty | — | Two years, extended to five (G5 programme) when the first owner registers the frame serial number on wilier.com; frames for teams get two years only |
| Sold via | Direct from Storck's web shop and Storck stores | Wilier dealers and wilier.com; in the US ordered online for pickup at an authorised dealer |
| Drivetrain | ||
| Groupset | Shimano Ultegra Di2 R8100 | SRAM Red AXS E1 |
| Launched | 2021 · current generation | 2024 · current generation |
| Speeds | 12-speed | 12-speed |
| Electronic | Yes | Yes |
| Wireless | — | Yes |
| Drivetrain | 2x | 2x |
| Shifters | — | SRAM Red AXS E1 |
| Crankset | Shimano Ultegra R8100 | SRAM Red AXS E1 Power Meter |
| Chainrings | 52/36 | 48/35 |
| Crank lengths available | 170 mm (XS-S), 172.5 mm (M-L), 175 mm (XL-XXL) | — |
| Spindle | — | DUB |
| Power meter | — | SRAM Red AXS E1 Power Meter |
| Launched | — | 2024 · current generation |
| Type | — | Integrated in crankset |
| Bottom bracket | Storck Press-fit 41 x 86.5 mm | SRAM DUB PF Road 86.5 |
| Standard | Press-fit, 41 mm bearing bore x 86.5 mm | PressFit 86.5 |
| Front derailleur | Shimano Ultegra Di2 | SRAM Red AXS E1 |
| Rear derailleur | Shimano Ultegra Di2 R8150 | SRAM Red AXS E1 |
| Cassette | Shimano Ultegra R8100 | SRAM Red XG-1290 E1 |
| Range | 11-30 | 10-36 |
| Speeds | 12-speed | 12-speed |
| Chain | Shimano Ultegra | SRAM Red E1 |
| Brakes | ||
| Brake calipers | Shimano Ultegra | SRAM Red AXS E1 |
| Type | Hydraulic disc, flat mount | Hydraulic disc |
| Notes | 160 mm rotors front and rear | — |
| Rotors | — | SRAM Paceline X |
| Front rotor | — | 160 mm |
| Rear rotor | — | 160 mm |
| Wheels & tires | ||
| Wheelset | Storck Zeitjaeger Platinum | Miche Deva RD 52 |
| Material | Carbon | Carbon |
| Notes | Choice of Zeitjaeger Platinum 47 R, 56 R or 65 R at the same price | Carbon spokes, CeramicSpeed bearings |
| Tires | Continental Grand Prix 5000 TT | Vittoria Corsa Pro |
| Tire width | 25 mm | 28 mm |
| Cockpit | ||
| Handlebar | Storck RBSU Aerfast.5 | Wilier F-Bar ID2 |
| Type | One-piece bar and stem | One-piece bar and stem |
| Integrated stem | Yes | Yes |
| Widths available | 380 mm / 90 mm stem (XS), 400/100 (S), 420/100 (M-L), 420/110 (XL), 440/120 (XXL) | 35/38, 37/40 or 39/42 cm (hoods/drops); stock size by frame: XS 75 mm x 35/38, S 90 x 37/40, M 100 x 37/40, L 110 x 37/40, XL 110 x 39/42, XXL 120 x 39/42 |
| Bar reach | — | 68 mm |
| Bar drop | — | 124 mm |
| Cable routing | — | Fully internal, through the bar and the Superfino upper bearing |
| Material | — | Carbon |
| Weight | — | 340 g12 oz |
| Notes | Blue Faded paint to match the Team frame | Weight is for the painted 110 mm x 37/40 cm size (+/- 5%); comes with a Garmin/Wahoo computer mount and hidden clamp hardware |
| Headset | Storck Aerfast.5 integrated headset | Wilier Custom Superslim 1-1/4" upper / FSA MR137 1-1/4" lower |
| Saddle & seatpost | ||
| Saddle | Selle San Marco Shortfit 2.0 Carbon | Prologo Nago R4 PAS Tirox |
| Saddle width | — | 137 mm |
| Seatpost | Storck Aerfast.5 Carbon | Wilier Filante ID2 carbon seatpost |
| Offset / setback | — | 0 mm (15 mm setback version sold as a spare part) |
| Material | Carbon | Carbon |
| Weight | — | 100 g3.5 oz |
| Bar tape | Storck Microfibre | — |
| Notes | Black | — |
| Included extras | ||
| Bottle cages | — | Elite Aerokit (Filante SLR ID2) |
| Notes | — | Two aero bottles (1,100 ml in total) with dedicated cages and carbon mounting bases for the down tube and seat tube |
| Geometry (smallest – largest size) | ||
| Sizes | XS, S, M, L, XL, XXL | XS, S, M, L, XL, XXL |
| Rider height min | 152–188 cm5′0″–6′2″ | — |
| Rider height max | 166–190 cm5′5″–6′3″ | — |
| Stack | 482–576 mm19–22.7″ | 505–595 mm19.9–23.4″ |
| Reach | 362.5–418 mm14.3–16.5″ | 373.5–408 mm14.7–16.1″ |
| Seat tube angle | 73° | 73–75.2° |
| Head tube angle | 70–73.3° | 70.6–73.5° |
| Head tube length | 85–170 mm3.3–6.7″ | 99–183 mm3.9–7.2″ |
| Effective top tube | 510–595 mm20.1–23.4″ | 508–590 mm20–23.2″ |
| Seat tube length | 460–583 mm18.1–23″ | 445–565 mm17.5–22.2″ |
| Chainstay | 410 mm16.1″ | 411–413 mm16.2–16.3″ |
| Wheelbase | — | 980.5–1,018.5 mm38.6–40.1″ |
| Wheel size | — | 700c |
| Crank length | 170–175 mm6.7–6.9″ | — |
| Stem length | 90–120 mm3.5–4.7″ | 75–120 mm3–4.7″ |
| Handlebar width | 380–440 mm15–17.3″ | 350–390 mm13.8–15.4″ |
| Handlebar reach | — | 68 mm2.7″ |
| Handlebar drop | — | 124 mm4.9″ |
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).