VentumOne Disc
The Ventum One Disc is Ventum's long-course triathlon bike. It keeps the brand's frame layout with no conventional down tube and adds disc brakes, a removable reservoir inside the frame and an adjustable monoriser cockpit. Ventum sells it direct to consumers in two complete builds.
- From
- $9,690$9,690$9,690
- Builds
- 2
- Sizes
- 6
- Frame weight
- —
Design sketch, generated from the manufacturer's photo
Our verdict
Overall
out of 100, average of 7 categories
A direct-sales Ironman bike for riders who value a large, removable in-frame reservoir, stable handling and easy shipping over the lowest weight. Both builds come with top-tier groupsets and deep Zipp wheels but no power meter, and the cockpit is cramped to work on, with a proprietary bar, reservoir and seatpost.
Scored Oct 2026
- + Integrated hydration and storage
- + Top-tier build kit
- + Wide fit adjustment
AI-drafted from the specs on this page and reviewed before publishing. Scores are relative to every bike in the catalog when they were given, so they drop as newer bikes and parts raise the bar.
- Aero
- 78/100
- Frame
- 68/100
- Components
- 86/100
- Hydration & storage
- 90/100
- Fit
- 80/100
- Practicality
- 72/100
- Price
- 62/100
Aero claims and front-end integration
Carbon grade, weight and warranty
Groupset, wheels and power meter
Hydration and storage in the frame
Sizes and adjustment range
Travel, standard parts, servicing
From the cheapest complete-bike MSRP
Bike duel
Reviews
2 independent reviews of the Ventum One Disc.
- Written
Slowtwitch
The Ventum One Makes a StatementRyan Heisler - WrittenChris Foster
Frame & platform
Frame & fork
- Frame material
- Carbon
- Fork material
- Carbon, tapered steerer
- Frame sizes
- XS, S, M, M/L, L, XL
- Colours
- White, Black
Compatibility & standards
- Brake type
- Disc, flat mount
- Wheel size
- 700c
- Max tire width
- 28 mm
- Bottom bracket standard
- PF30
- Front axle
- Thru-axle
- Rear axle
- Thru-axle
- Drivetrain compatibility
- Electronic (Shimano Di2 and SRAM eTap AXS builds offered)
- Cable routing
- Internal; brake hoses run through the frame and fork
Hydration & storage
- Integrated hydration
- Yes
- Hydration volume
- 1,400 ml47.3 fl oz
- Hydration details
- Removable reservoir inside the frame, in the space a down tube would normally take: 1.4 L on sizes S to XL, 1.2 L on XS. Ventum says it is removable and easy to clean.
- Integrated storage
- Yes
- Storage details
- Storage compartment under the hydration reservoir.
Fit & adjustability
- Aerobar system
- Ventum One Disc aerobar system (basebar, extensions and arm pads included with the bike)
- Pad stack adjustment range
- Telescoping monoriser for pad height; mast tilt adjustable
- Seatpost type
- Ventum carbon post, 0° offset; minimum insertion 10 cm
- Fit notes
- Arm-pad height is set by sliding the monoriser mast and the pads can be tilted. Slowtwitch reports dozens of pre-drilled pad mounting positions.
Travel, maintenance & warranty
- Travel & packing
- Ventum ships bikes about 98% assembled in a custom box within the continental US; elsewhere about 85% assembled, with the stem also to be fitted. Slowtwitch packed the bike into a standard bike box without disconnecting the hydraulic brakes.
- Headset bearings
- 40 x 52 x 7 mm, 45°x45° bearings (shared with the GS1 and NS1)
- Derailleur hanger
- Proprietary: Ventum rear derailleur hanger (same part as the 2020-2022 GS1)
- Maintenance
- The Di2 junction or SRAM Blipbox sits in the nose cone at the front of the cockpit. If externally clamped brake levers such as TRP HD-T910 are used, Ventum advises trimming 3 cm off each end of the basebar and fitting the alloy reinforcement inserts.
- Proprietary parts
- Hydration reservoir, aerobar system and seatpost are specific to the One Disc
- Frame warranty
- Limited lifetime warranty on frame, fork and seatpost for the original owner
- Sold via
- Direct to consumer
Photos
Design sketches
Builds & components
Highlighted rows differ between builds. Green marks the best value.
One Disc Dura-Ace Di2 | One Disc Red AXS | |
|---|---|---|
| Overview | ||
| Price (MSRP) | $9,690$9,690$9,690 | $9,690$9,690$9,690 |
| Type | Complete bike | Complete bike |
| Notes | The manufacturer lists crank lengths for S to XL only. Ventum sets up carbon-wheel builds tubeless. | The manufacturer lists crank lengths for S to XL only. Ventum sets up carbon-wheel builds tubeless. |
| Drivetrain | ||
| Groupset | Shimano Dura-Ace Di2 R9200 | SRAM Red AXS |
| Launched | 2021 · current generation | — |
| Speeds | 12-speed | 12-speed |
| Electronic | Yes | Yes |
| Wireless | — | Yes |
| Drivetrain | 2x | 2x |
| Shifters | Shimano Dura-Ace Di2 TT shift switch + TT/triathlon dual control lever | SRAM AXS Wireless Blips |
| Position | Extensions and base bar | Extensions and base bar |
| Crankset | Shimano Dura-Ace | SRAM Red |
| Chainrings | 52/36 | 48/35 |
| Crank length | 165 (S, M) / 170 (L, XL) | 165 (S, M) / 170 (L, XL) |
| Bottom bracket | Wheels Manufacturing PF30 | SRAM DUB PF30 |
| Standard | PF30 | PF30 |
| Front derailleur | Shimano Dura-Ace Di2 | SRAM Red AXS |
| Rear derailleur | Shimano Dura-Ace Di2 | SRAM Red AXS |
| Cassette | Shimano Dura-Ace R9200 | SRAM Red XG-1290 E1 |
| Range | 11-30 | 10-36 |
| Speeds | 12-speed | 12-speed |
| Chain | Shimano Dura-Ace | SRAM Red E1 |
| Brakes | ||
| Brake calipers | Shimano Dura-Ace hydraulic disc | SRAM S-900 Aero HRD |
| Type | Hydraulic disc | Hydraulic disc |
| Rotors | Shimano Dura-Ace Center Lock | SRAM Paceline Center Lock |
| Front rotor | 160 mm | 160 mm |
| Rear rotor | 140 mm | 140 mm |
| Mount | Center Lock | Center Lock |
| Wheels & tires | ||
| Wheelset | Zipp 808 Firecrest | Zipp 808 Firecrest |
| Front rim depth | 80 mm | 80 mm |
| Rear rim depth | 80 mm | 80 mm |
| Rear disc wheel | No | No |
| Internal rim width | 23 mm | 23 mm |
| Material | Carbon | Carbon |
| Tubeless ready | Yes | Yes |
| Rim bead | Hookless | Hookless |
| Notes | Shimano HG freehub | SRAM XDR driver |
| Tires | Schwalbe One Performance RaceGuard | Schwalbe One Performance RaceGuard |
| Tire width | 28 mm | 28 mm |
| Set up tubeless | Yes | Yes |
| Type | Tubeless | Tubeless |
| Cockpit | ||
| Aerobar system | Ventum One Disc Aerobar System | Ventum One Disc Aerobar System |
| Pad stack adjustment | Telescoping monoriser | Telescoping monoriser |
| Tilt adjustment | Mast tilt | Mast tilt |
| Saddle & seatpost | ||
| Saddle | Fizik Aeris SD R5 | Fizik Aeris SD R5 |
| Saddle width | 135 mm | 135 mm |
| Seatpost | Ventum Carbon seatpost | Ventum Carbon seatpost |
| Offset / setback | 0° | 0° |
| Material | Carbon | Carbon |
| Included extras | ||
| Hydration system | Ventum One Disc Hydration System | Ventum One Disc Hydration System |
| Volume | 1,400 ml47.3 fl oz | 1,400 ml47.3 fl oz |
One Disc price & value
Spare & upgrade parts from Ventum
| Part | Part number | Price |
|---|---|---|
| Rear derailleur hangerChoose the '2020-2022 GS1 (V1) / Ventum ONE Disc' option. | — | $55$55$55 |
| Thru-axle pair (front and rear)Not sold individually. | — | $60$60$60 |
| Headset bearings (pair), 40 x 52 x 7 mm, 45°x45° | — | $40$40$40 |
| Headset compression ring | — | $20$20$20 |
| Front derailleur braze-on mount | — | $20$20$20 |
| Integrated hydration reservoir (1.4 L for S-XL, 1.2 L for XS) | — | $55$55$55 |
| Hydration reservoir bracket | — | $10$10$10 |
| Bottle/stem cover (size-specific) | — | $35$35$35 |
| Thumb bolt for the integrated bottle | — | $14$14$14 |
| Hydration straw | — | $10$10$10 |
| Bite valve | — | $6$6$6 |
| Magnet kit to hold the hydration straw on the aerobars | — | $40$40$40 |
| Aero pads (pair) | — | $35$35$35 |
| Ventum ONE seatpost | — | $300$300$300 |
| Rear hydration mount (titanium, with Arundel Mandible cage)Holds one bottle of up to 22 oz; Ventum says fitting two cages can break it and voids the warranty. | — | $160$160$160 |
Ownership checklist
0 of 3 known checks pass, 4 not published by Ventum. Why these checks
- ✕
Threaded bottom bracket
PF30
- ✕
UDH derailleur hanger
Proprietary: Ventum rear derailleur hanger (same part as the 2020-2022 GS1)
- ✕
Standard 12×142 mm rear axle
Thru-axle
- ?
Works with mechanical shifting
- ?
Fits third-party aerobars
Ventum One Disc aerobar system (basebar, extensions and arm pads included with the bike)
- ?
Rear disc wheel compatible
- ?
Fit kept when packed
Raced by
Pros who raced the One Disc, with results on it.
© Ventum Jocelyn McCauley2023United States
- 10thIronman World Championship (Kona) 2023
Setup: Shimano Ultegra Di2 with Rotor crank, HED Jet wheels (Kona 2023)
Race setup, 3 parts →Source
One Disc geometry
| XS | S | M | M/L | L | XL | |
|---|---|---|---|---|---|---|
| Stack | 499 mm19.6″ | 505 mm19.9″ | 510 mm20.1″ | 528 mm20.8″ | 545 mm21.5″ | 564 mm22.2″ |
| Reach | 380 mm15″ | 397 mm15.6″ | 394 mm15.5″ | 409 mm16.1″ | 422 mm16.6″ | 437 mm17.2″ |
| Seat angle min | 82° | 82° | 82° | 82° | 82° | 82° |
| Seat angle max | 82° | 82° | 82° | 82° | 82° | 82° |
| Head tube angle | 72.6° | 72.5° | 72.5° | 72.5° | 72.5° | 72.5° |
| Head tube length | 82 mm3.2″ | 90 mm3.5″ | 95 mm3.7″ | 114 mm4.5″ | 132 mm5.2″ | 152 mm6″ |
| Effective top tube | 451 mm17.8″ | 467 mm18.4″ | 470 mm18.5″ | 485 mm19.1″ | 500 mm19.7″ | 518 mm20.4″ |
| Chainstay | 399 mm15.7″ | 399 mm15.7″ | 399 mm15.7″ | 399 mm15.7″ | 399 mm15.7″ | 399 mm15.7″ |
| Wheelbase | 951 mm37.4″ | 971 mm38.2″ | 970 mm38.2″ | 990 mm39″ | 1,009 mm39.7″ | 1,030 mm40.6″ |
| BB drop | 76 mm3″ | 75 mm3″ | 75 mm3″ | 75 mm3″ | 75 mm3″ | 75 mm3″ |
| Front centre | 565 mm22.2″ | 582 mm22.9″ | 584 mm23″ | 603 mm23.7″ | 622 mm24.5″ | 643 mm25.3″ |
| Crank length | — | 165 mm6.5″ | 165 mm6.5″ | — | 170 mm6.7″ | 170 mm6.7″ |
Side view & pad range
Drawn to scale (how to read it).
How the geometry rides
The One Disc in size M against the middle size of 42 other bikes: tendencies from geometry, not a ride review (how to read this).
- Wheelbase970 mm38.2″
shortestlonger than 1% of 42 bikeslongest
Short wheelbase: tends to feel more agile in corners and less planted on long straights.
- Front centre584 mm23″
shortestlonger than 16% of 29 bikeslongest
Short front centre: more weight on the front wheel, which can make the front feel lighter to steer.
- Chainstay399 mm15.7″
shortestlonger than 14% of 53 bikeslongest
Short chainstays: a compact, responsive rear end.
Good to know
Design
Slowtwitch called it the most stable-handling triathlon bike its reviewer had ridden. Its SRAM Force AXS test bike weighed 23 lb 9.5 oz with pedals.
SourceFit
Pad height is set by sliding the monoriser mast in its clamp, and a separate pair of bolts sets the mast tilt. Both are clamped at 7 Nm.
SourceIntegration
The reservoir is 1.4 L on sizes S to XL and 1.2 L on XS, because it has to fit the smaller frame. It comes out for cleaning, and there is a storage compartment beneath it.
SourceCompatibility
Ventum gives two tire clearance figures. The spec table on both build pages says 700x30c, but the Dura-Ace page's bullet points and Ventum's support FAQ say 28 mm. The 28 mm figure is used here. Slowtwitch's review also says up to 28 mm.
SourceTravel
Slowtwitch found the bike could be packed into an ordinary bike box without disconnecting the hydraulic brake lines.
SourceMaintenance
Front-end routing is tight. The manual says to run the Di2 or eTap wires before the hydraulic hoses and to guide the wires to either side of the mast so they are not pinched when it is inserted. Slowtwitch noted a mix of 3, 4 and 5 mm bolt heads across the bike.
SourceHistory
The original Ventum One was a rim-brake bike first reviewed in 2015. It already had no conventional down tube and carried a plastic fluid tank of about 40 oz that completed the top tube shape.
SourceVersions
The One Disc keeps the original's frame layout and hydration concept and adds hydraulic disc brakes, internal routing and a new, more adjustable front end. It was reviewed as a new model in August 2022.
Source
One Disc FAQ
Is the Ventum One Disc UCI legal?+
No. The Ventum One Disc is not UCI legal. That is fine for non-drafting triathlon, but it cannot be used in UCI-sanctioned time trials.
How much does the Ventum One Disc cost?+
Manufacturer prices (MSRP): $9,690 across 2 listed builds and framesets: One Disc Dura-Ace Di2 and One Disc Red AXS.
What sizes does the Ventum One Disc come in?+
6 sizes: XS, S, M, M/L, L and XL.
What seat angle does the Ventum One Disc have?+
82° effective seat tube angle.
Does the Ventum One Disc have integrated hydration?+
Yes, 1,400 ml (47.3 fl oz). Removable reservoir inside the frame, in the space a down tube would normally take: 1.4 L on sizes S to XL, 1.2 L on XS. Ventum says it is removable and easy to clean.
Does the Ventum One Disc have integrated storage?+
Yes. Storage compartment under the hydration reservoir.
What is the tire clearance of the Ventum One Disc?+
Up to 28 mm tires on 700c wheels.
Which groupsets are compatible with the Ventum One Disc?+
Drivetrain compatibility: Electronic (Shimano Di2 and SRAM eTap AXS builds offered). Bottom bracket: PF30.
What builds of the Ventum One Disc are available?+
One Disc Dura-Ace Di2: Shimano Dura-Ace Di2 R9200; One Disc Red AXS: SRAM Red AXS.
Which pros ride the Ventum One Disc?+
Jocelyn McCauley raced this generation of the Ventum One Disc. See the "Raced by" section for seasons and results.
Is the Ventum One Disc easy to travel with?+
Ventum ships bikes about 98% assembled in a custom box within the continental US; elsewhere about 85% assembled, with the stem also to be fitted. Slowtwitch packed the bike into a standard bike box without disconnecting the hydraulic brakes.
What warranty does the Ventum One Disc frame have?+
Limited lifetime warranty on frame, fork and seatpost for the original owner
Sources
- https://ventumracing.com/bikes/triathlon/
- https://ventumracing.com/one-disc-dura-ace/
- https://ventumracing.com/one-disc-red-axs/
- https://ventumracing.com/content/pdfs/Ventum-One-Disc-User-Guide.pdf
- https://www.slowtwitch.com/triathlon/the-ventum-one-makes-a-statement/
- https://ttbikefit.com/ventum-one-first-looks-frame-buildup-and-early-road-test-impressions/
- https://ventumracing.com/rear-derailleur-hanger/
- https://ventumracing.com/headset-bearings/
- https://www.slowtwitch.com/news/top-15-womens-bikes-from-kona-2023/
- https://ventumracing.com/thru-axle-pair/
- https://ventumracing.com/token-compression-ring/
- https://ventumracing.com/front-derailleur-braze-on-mount/
- https://ventumracing.com/ventum-one-disc-bottle/
- https://ventumracing.com/ventum-one-disc-bottle-bracket/
- https://ventumracing.com/ventum-one-disc-bottle-stem-cover/
- https://ventumracing.com/thumb-bolt/
- https://ventumracing.com/hydration-straw/
- https://ventumracing.com/bite-valve/
- https://ventumracing.com/magnet-kit/
- https://ventumracing.com/ventum-one-disc-aero-pads-pair/
- https://ventumracing.com/ventum-one-seat-post/
- https://ventumracing.com/rear-hydration-mount/
Ventum One Disc data last updated · How the data is checked ·