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Cube Aerium C:68X vs Ventum Tempus
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 Cube Aerium C:68X higher overall: 77/100 vs 75/100.
- Only the Ventum Tempus is UCI legal, so only it can be raced in UCI time trials.
- Only the Cube Aerium C:68X has integrated hydration.
- Only the Cube Aerium C:68X has integrated storage.
Cube Aerium C:68X
Ventum Tempus
| CubeAerium C:68X | VentumTempus | |
|---|---|---|
| Overview | ||
| Brand | Cube | Ventum |
| Build | Aerium C:68X SLT Aero | Tempus SRAM Rival AXS |
| Build notes | — | Ventum will fit a different crank length (165, 170, 172.5 or 175 mm) for $75. No computer mount is included. |
| Price (MSRP) | €9,999€9,999€9,999 | $5,799$5,799$5,799 |
| Bike weight | 10.3 kg22.7 lb | — |
| Model year | 2026 | 2025 |
| Generation | Aerium C:68X (successor to the Aerium C:68 TT) | — |
| Launched | 2023 | 2025-03 |
| Discipline | Triathlon | Triathlon |
| UCI legal | No | Yes |
| Verdict (out of 100) | ||
| Overall score | 77 | 75 |
| Aero | 85 | 80 |
| Frame | 70 | 72 |
| Components | 80 | 82 |
| Hydration & storage | 84 | 45 |
| Fit | 72 | 74 |
| Practicality | 62 | 86 |
| Price | 87 | 85 |
| Frame & fork | ||
| Frame material | Carbon (C:68X) | Carbon |
| Fork material | Carbon (Aerium C:68X) | Carbon, tapered steerer, carbon dropouts |
| Max system weight | 100 kg220.5 lb | — |
| Frame sizes | XS, S, M, L | S, M, L, XL |
| Also available as | Aerium C:68X TT (separate UCI-approved time-trial frame) | — |
| UCI frame approval | — | UCI-approved as 'Tempus' (frame and fork code VENTUM-002), approved 06.09.2024, sizes XS to XL (5) (UCI list version 2026.10.02) |
| Compatibility & standards | ||
| Brake type | Flat-mount disc | Disc, flat mount |
| Wheel size | 700c | 700c |
| Max tire width | 30 mm | 30 mm |
| Bottom bracket standard | 86mm press-fit | T47 threaded |
| Front axle | 12x100 thru-axle | — |
| Rear axle | 12x142 thru-axle | — |
| Drivetrain compatibility | Electronic; 1x or 2x (front derailleur mount cover plate for 1x) | Electronic (Shimano Di2 and SRAM AXS builds offered); UDH derailleur hanger |
| 1x compatible | Yes | — |
| Front derailleur mount | Braze-on, with cover plate for 1x setups | — |
| Cable routing | Fully internal (frame and handlebars) | Internal; brake hoses run inside the frame and fork |
| Hydration & storage | ||
| Integrated hydration | Yes | No |
| Hydration volume | 750 ml25.4 fl oz | — |
| Hydration details | Bar-mounted Hydration Set Aerium (750 ml) with a refill door, plus an optional in-frame bladder above the bottom bracket that refills through a port in the top-tube nutrition box. The Hydration Set cannot be used with 40 mm or more of spacers. | — |
| Integrated storage | Yes | — |
| Storage details | CUBE Hydration Set Aerium (750 ml, bar-mounted) plus a compartment above the bottom bracket for an additional hydration bladder or spares; Storage Box Set Aerium for nutrition. | — |
| Top tube bento box | Yes | — |
| Fit & adjustability | ||
| Aerobar system | CUBE Aerium C:68X Cockpit System in Low (XS-S) or High (M-L) setup; extensions can be swapped | Profile Design Wing Ultimate S carbon basebar, developed together with Ventum for the Tempus |
| Third-party aerobars possible | — | Yes |
| Pad stack adjustment range | — | Profile Design A3A risers with 30 mm of stack as standard; see pad stack per size |
| Extension options | — | Profile Design 52 ASC carbon (52 A alloy on the Rival build); ASC Pro upgrade for $600 in 325, 350 or 375 mm |
| Seatpost type | CUBE Aerium C:68 Aero seatpost | Ventum carbon post, 0° offset |
| Effective seat angle range | — | 82° |
| Fit notes | Arm pads adjust over a wide range of widths and stack heights, and saddle stack and reach are adjustable. | — |
| Aerodynamics | ||
| Manufacturer aero claims | Cube claims the C:68X is 3.63 W faster than the previous Aerium C:68 | Up to 15 W faster than the Ventum One Disc in certain conditions and configurations |
| Testing method | Wind tunnel, CFD and athlete feedback | CFD and wind tunnel |
| Tube profile | Twin head tube with a cutout, very low seatstays, deep fork | Airfoil tube sections along the whole frame; very wide-set fork legs and seat stays |
| Travel, maintenance & warranty | ||
| Travel & packing | — | Ventum ships bikes in a ride-ready box: about 98% assembled within the continental US (fit wheels and seatpost), about 85% elsewhere (stem also to fit). |
| Headset bearings | Acros integrated, 1-1/8" top, 1-1/4" bottom | — |
| Derailleur hanger | — | UDH (SRAM Universal Derailleur Hanger) |
| Frame warranty | — | Limited lifetime warranty on frame, fork and seatpost for the original owner |
| Sold via | Through CUBE dealers | Direct to consumer |
| Drivetrain | ||
| Groupset | SRAM Red AXS E1 | SRAM Rival AXS |
| Launched | 2024 · current generation | — |
| Speeds | 12-speed | 12-speed |
| Electronic | Yes | Yes |
| Wireless | Yes | Yes |
| Drivetrain | — | 2x |
| Shifters | SRAM Red eTap Clics / eTap Blips | SRAM AXS Wireless Blips |
| Position | — | Extensions |
| Crankset | SRAM Red AXS E1 | SRAM Rival |
| Chainrings | 50 | 48/35 |
| Crank length | 165 (XS-M) / 170 (L) | 165 (S, M) / 170 (L, XL) |
| Power meter | SRAM Red AXS E1 Power Meter | — |
| Launched | 2024 · current generation | — |
| Type | Spider | — |
| Bottom bracket | SRAM DUB Road 86mm Pressfit | SRAM DUB T47 |
| Standard | 86mm press-fit | T47 |
| Front derailleur | — | SRAM Rival AXS |
| Rear derailleur | SRAM Red AXS E1 | SRAM Rival AXS |
| Cassette | SRAM Red XG-1290 E1 | SRAM Rival XG-1250 |
| Range | 10-33 | 10-36 |
| Speeds | 12-speed | 12-speed |
| Chain | SRAM Red E1 (CeramicSpeed wax coating) | SRAM Rival |
| Brakes | ||
| Brake calipers | SRAM Red Aero E1 | SRAM S-900 Aero HRD |
| Type | Hydraulic disc | Hydraulic disc |
| Rotors | 160/160 | SRAM Paceline |
| Front rotor | 160 mm | 160 mm |
| Rear rotor | 160 mm | 140 mm |
| Mount | — | Center Lock |
| Wheels & tires | ||
| Wheelset | Newmen Streem TT.80 / Infinite VONOA Carbon | Zipp 404 |
| Front rim depth | 80 mm | — |
| Rear disc wheel | Yes | — |
| Material | Carbon | — |
| Tubeless ready | Yes | Yes |
| Tires | Schwalbe Pro One Aero TLR | Schwalbe One Performance RaceGuard |
| Tire width | 28 mm | 28 mm |
| Set up tubeless | Yes | — |
| Cockpit | ||
| Aerobar system | CUBE Aerium C:68X Cockpit System (XS-S Low, M-L High) | — |
| Basebar | — | Profile Design Wing Ultimate S |
| Extensions | Profile Design ASC Pro Carbon | Profile Design 52 A |
| Arm pads / cups | — | Profile Design A3A risers |
| Notes | — | 30 mm of stack |
| Headset | Acros Integrated, 1 1/8" top / 1 1/4" bottom | — |
| Saddle & seatpost | ||
| Saddle | Selle Italia Watt SF Magnesium | Fizik Aeris SD R5 |
| Saddle width | — | 135 mm |
| Seatpost | CUBE Aerium C:68 Aero | Ventum Tempus carbon post |
| Offset / setback | — | 0° |
| Geometry (smallest – largest size) | ||
| Sizes | XS, S, M, L | S, M, L, XL |
| Stack | 487–539 mm19.2–21.2″ | 466–539 mm18.3–21.2″ |
| Reach | 395–442 mm15.6–17.4″ | 387–444 mm15.2–17.5″ |
| Pad stack min | — | 582–655 mm22.9–25.8″ |
| Pad stack max | — | 652–725 mm25.7–28.5″ |
| Pad reach min | — | 382–439 mm15–17.3″ |
| Pad reach max | — | 487–544 mm19.2–21.4″ |
| Seat angle min | 78° | 82° |
| Seat angle max | 78° | 82° |
| Head tube angle | 72° | 72.5–72.6° |
| Head tube length | 74–129 mm2.9–5.1″ | 47–125 mm1.9–4.9″ |
| Effective top tube | 499–557 mm19.6–21.9″ | 452–520 mm17.8–20.5″ |
| Seat tube length | 535–588 mm21.1–23.1″ | 523–597 mm20.6–23.5″ |
| Chainstay | 410 mm16.1″ | 410 mm16.1″ |
| Wheelbase | 979–1,043 mm38.5–41.1″ | 948–1,029 mm37.3–40.5″ |
| BB drop | 78 mm3.1″ | 75–76 mm3–3″ |
| Trail | — | 61 mm2.4″ |
| Front centre | — | 562–642 mm22.1–25.3″ |
| Standover | — | 790–863 mm31.1–34″ |
| Wheel size | 28" (700c) | — |
| Crank length | — | 165–170 mm6.5–6.7″ |
| Stem length | 81 mm3.2″ | — |
| Basebar width | 400 mm15.7″ | — |
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).