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Storck Aerfast.4 Red Edition vs Time Scylon
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 Time Scylon higher overall: 75/100 vs 71/100.
- Tire clearance: up to 28 mm on the Storck Aerfast.4 Red Edition vs 32 mm on the Time Scylon.
Storck Aerfast.4 Red Edition
Time Scylon
| StorckAerfast.4 Red Edition | TimeScylon | |
|---|---|---|
| Overview | ||
| Brand | Storck | Time |
| Build | Aerfast.4 Red Edition Red eTap AXS D1 | Scylon Shimano Dura-Ace |
| Build notes | Fixed build with the previous-generation SRAM Red AXS (D1) and Zeitjaeger Comp 55R wheels, sizes XS-M. MSRP €7,299; Storck showed it reduced to €5,499 on 2 Nov 2026. Price from Storck's own web shop (EUR only). No power meter. | Sold on TIME's US online store in six sizes (XXS-XL) and four colours. TIME's site lists US dollar prices only; its international store charges in local currency converted at checkout, so no EUR or GBP MSRP is published. TIME's spec list names the bottom bracket as 'PF 386 EVO / FSA Press Fit' and the derailleurs as '9270'. |
| Price (MSRP) | €7,299€7,299€7,299 | $11,999$11,999$11,999 |
| Model year | 2026 | 2025 |
| Generation | Aerfast.4 (fourth generation) | 2025 Scylon (2nd generation) |
| Launched | 2021 | 2025 |
| Newer generation | Aerfast.5 (2024) | — |
| Discipline | Aero road | Aero road |
| UCI legal | Yes | Yes |
| Verdict (out of 100) | ||
| Overall score | 71 | 75 |
| Aero | 86 | 84 |
| Frame | 74 | 86 |
| Components | 76 | 84 |
| Fit | 58 | 68 |
| Practicality | 58 | 60 |
| Price | 71 | 70 |
| Frame & fork | ||
| Frame material | Carbon (CFR/UD), Red Edition frame | Carbon (TIME Gen 2 Braided Carbon Structure, M46J high-modulus and T800 fibres) |
| Fork material | — | Carbon (Kevlar-reinforced BCS), tapered 1-1/8" to 1-1/2" steerer |
| Frame weight | 950 g33.5 oz | — |
| Fork weight | 500 g17.6 oz | — |
| Frameset weight | 1,900 g4.19 lb | — |
| Weight measured on | 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 | XS, S, M | XXS, XS, S, M, L, XL |
| Colours | Black with red accents (Storck names no colour) | S01 Nude, S02 Pearl, S03 Brilliant Red, S04 Brilliant Purple (frameset also Ready to Paint) |
| 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 | 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 | Approved 20 May 2026 as 'SCYLON' with the TF33 fork, sizes XXS-XL (6), code TIME-015 (UCI list version 2026.10.02) |
| Compatibility & standards | ||
| Brake type | Hydraulic disc, flat mount (160 mm rotors front and rear as built) | Flat mount disc |
| Max rotor size | — | 160 mm |
| Wheel size | — | 700c |
| Max tire width | 28 mm | 32 mm |
| Bottom bracket standard | Press-fit, 41 mm bearing bore x 86.5 mm | PF386 EVO press-fit |
| Front axle | — | 12 mm thru axle, 121 mm long, 1.5 mm thread pitch |
| Rear axle | — | 12 mm thru axle, 161 mm long, 1.5 mm thread pitch |
| Drivetrain compatibility | — | TIME states compatibility with all electronic shifting systems (Shimano Di2, SRAM AXS, Campagnolo EPS); all stock builds are 2x |
| Front derailleur mount | — | Standard mount |
| Cable routing | Internal through the one-piece cockpit | Fully internal (multi-brand compatible) |
| Fit & adjustability | ||
| Cockpit | One-piece Storck RBSU Aerfast.4 bar and stem, one size per frame size | One-piece Vision Metron 5D EVO bar and stem on complete bikes; the FSA headset with SRS top cap is made for semi- and fully-integrated cockpits |
| Seatpost type | Storck Aerfast.4 carbon aero seatpost | Proprietary Scylon aero carbon post with a semi-integrated TIME CNC alloy clamp; round posts don't fit |
| Saddle position range | — | -20 mm to +10 mm (patented rail clamp) |
| 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 | 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 | 12% aerodynamic improvement over the previous Scylon; the new fork alone cuts drag by 4% |
| Testing method | Wind tunnel | TIME cites shaping and CFD analysis; it publishes no wind-tunnel figures |
| Tube profile | 80 mm wide aero fork with a camtail trailing edge | Airfoil-shaped down tube and seat tube |
| Travel, maintenance & warranty | ||
| Headset bearings | — | FSA No.69 SRS, 1-1/8" / 1.5", 45°/45° (ACR) |
| Proprietary parts | RBSU Aerfast.4 one-piece cockpit, Aerfast.4 seatpost and headset | Seatpost and clamp, headset top cover for the ACR system, derailleur hangers, cable ports and routing kit |
| Frame warranty | — | TIME lifetime warranty |
| Sold via | Direct from Storck's web shop and Storck stores | Direct from TIME's online store (US) and through TIME dealers |
| Drivetrain | ||
| Groupset | SRAM Red eTap AXS D1 | Shimano Dura-Ace Di2 R9200 |
| Launched | 2019 · replaced by SRAM Red AXS E1 (2024) | 2021 · current generation |
| Speeds | 12-speed | 12-speed |
| Electronic | Yes | Yes |
| Wireless | Yes | — |
| Drivetrain | 2x | 2x |
| Shifters | — | Shimano Dura-Ace Di2 ST-R9270 |
| Crankset | SRAM Red eTap AXS D1 | Shimano Dura-Ace R9200 |
| Chainrings | 48/35 | 52/36 |
| Bottom bracket | Storck Press-fit 41 x 86.5 mm | FSA PF386 EVO |
| Standard | Press-fit, 41 mm bearing bore x 86.5 mm | PF386 EVO press-fit |
| Front derailleur | SRAM Red eTap AXS | Shimano Dura-Ace Di2 |
| Notes | — | TIME lists it as 'Dura-Ace 9270 Di2' |
| Rear derailleur | SRAM Red eTap AXS D1 | Shimano Dura-Ace Di2 |
| Notes | — | TIME lists it as 'Dura-Ace 9270 Di2' |
| Cassette | SRAM Red | Shimano Dura-Ace R9200 |
| Range | 10-33 | 11-30 |
| Speeds | 12-speed | 12-speed |
| Chain | SRAM Red | Shimano Dura-Ace CN-M9100 |
| Brakes | ||
| Brake calipers | SRAM Red | Shimano Dura-Ace BR-R9270 |
| Type | Hydraulic disc, flat mount | Hydraulic disc |
| Notes | 160 mm rotors front and rear | — |
| Rotors | — | Shimano RT-MT900 |
| Front rotor | — | 160 mm |
| Rear rotor | — | 160 mm |
| Mount | — | Center Lock |
| Wheels & tires | ||
| Wheelset | Storck Zeitjaeger Comp 55R | Mavic Cosmic SL 65 |
| Front rim depth | — | 65 mm |
| Rear rim depth | — | 65 mm |
| Material | Carbon | Carbon |
| Tires | Continental Grand Prix 5000 S TR | Vittoria Corsa N.EXT |
| Tire width | 28 mm | 30 mm |
| Cockpit | ||
| Handlebar | Storck RBSU Aerfast.4 | Vision Metron 5D EVO |
| Type | One-piece bar and stem | One-piece carbon 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) | — |
| Notes | — | TIME lists it as the 'Metron 5D Evo Integrated Bar'; sizes fitted per frame size aren't stated. |
| Headset | Storck Aerfast.4 integrated headset | FSA No.69 SRS ACR |
| Saddle & seatpost | ||
| Saddle | Fizik Vento Argo R5 | Selle Italia SLR Advan |
| Seatpost | Storck Aerfast.4 Carbon | Time Scylon Aero Carbon |
| Offset / setback | — | -20 mm to +10 mm setback in one clamp |
| Material | Carbon | Carbon |
| Notes | — | Proprietary aero post (305 mm standard, 360 mm XL); takes 7 mm round and 7x9 mm oval rails |
| Bar tape | Storck Microfibre | Arundel Gecko Grip |
| Notes | Black | — |
| Geometry (smallest – largest size) | ||
| Sizes | XS, S, M, L, XL, XXL | XXS, XS, S, M, L, XL |
| Rider height min | 152–188 cm5′0″–6′2″ | — |
| Rider height max | 166–190 cm5′5″–6′3″ | — |
| Stack | 482–576 mm19–22.7″ | 515–601 mm20.3–23.7″ |
| Reach | 362.5–418 mm14.3–16.5″ | 372–397 mm14.6–15.6″ |
| Seat tube angle | 73° | 73° |
| Head tube angle | 70–72° | 71.5–73° |
| Head tube length | 85–170 mm3.3–6.7″ | 120–203 mm4.7–8″ |
| Effective top tube | 510–595 mm20.1–23.4″ | 529–584 mm20.8–23″ |
| Seat tube length | 458–583 mm18–23″ | 470–565 mm18.5–22.2″ |
| Chainstay | 410 mm16.1″ | 410 mm16.1″ |
| Wheelbase | — | 980–1,011 mm38.6–39.8″ |
| BB drop | — | 67 mm2.6″ |
| Fork length | — | 370 mm14.6″ |
| Fork offset | — | 43–50 mm1.7–2″ |
| Trail | — | 59–62 mm2.3–2.4″ |
| Front centre | — | 579–609 mm22.8–24″ |
| Crank length | 170–175 mm6.7–6.9″ | — |
| Stem length | 90–120 mm3.5–4.7″ | — |
| Handlebar width | 380–440 mm15–17.3″ | — |
Geometry overlay
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