Wind Tunnel Validated ✅
The Fastest Wind Tunnel Tested BTS EZ Hydro-Gains® Makes You Faster!
Most Used Aero Product used by Pro Athletes !!
Improve your race times with the EZ Hydro-Gains
This table shows you how much time you can expect to save across different distances if you held the same power for your race. Whether you're pushing 150 watts (or lower) or 250 watts (or higher) you'll be saving time. This is taking an average saving for the EZ Hydro-Gains from various wind tunnel testing sessions.
Save Up to 17 Watts!
Independently verified through Fast or Fiction, their data shown here shows how you can save a lot of watts through different configurations when compared to no rear hydration system. Click to zoom in!
Watch the video below to see the testing in action.
How the EZ Hydro-Gains Reduces Drag:
Airflow over a triathlete forms a large chaotic wake behind the rider, this creates pressure drag which overall increases their aerodynamic drag. With an aerodynamically efficient rear bottle system, like the EZ Hydro Gains, the area behind the rider is 'filled in' reducing the size of this chaotic wake and overall reducing a riders CdA. This difference in airflow is simplified and shown in the diagrams to the left, click between the images to see how you can reduce your Aerodynamic Drag by using the EZ Hydro Gains!
Wind Tunnel Validated ✅ The Fastest BTS
The optimal BTS setup can vary between riders, but our testing has identified several consistent trends.
In most cases, a double-bottle configuration is faster than a single-bottle setup for athletes weighing over 60 kg or those with wider hips. Bottle position is critical—the bottles should be placed as close to the rider's body as possible. Our testing indicates that moving the bottles approximately 25 mm further away from the body can increase aerodynamic drag by around one watt.
Rider position and body shape also influence the ideal bottle choice. Riders with a more rounded back often benefit from smaller bottles, while those with a flatter back may achieve better aerodynamic performance with larger bottles. The goal is to minimise airflow disturbance behind the rider.
The rear of the BTS system is particularly important. Airflow at this point is already wrapping around the rider's body, so larger BTS structures or oversized "fin" designs can increase drag by presenting a larger surface for the airflow to separate around. A more compact design generally produces less aerodynamic disturbance.
2025 Ironman World Champs Fastest Bike Split - Sam Laidlow
2025 Ironman World Champion - Casper Stornes
2025 Ironman World Champion + Fastest Bike Split - Solveig Løvseth
2025 70.3 Ironman World Champion - Jelle Geens
2025 Ironman World Champs Fastest Bike Split - Taylor Knibb (Unofficial)
2025 European Ironman Bike 2nd - Gustav Iden
Kristian Blummenfelt - Legend
Danielle Lewis
Vincent Luis - Legend
Wind Tunnel Validated ✅
Silverstone Sports Engineering Hub 08/07/26
Independent Testing Engineer: Wind Tunnel Verification: Independent Test Subjects
The test subject wanted to identify the fastest BTS system on the market, EZ Gains totally embraced this challenge, it was important to test the most optimal set-up, so it could give a fair comparison.
Bottles Close to the Bum IS Faster, its not possible to do this with most other BTS units on the market, especially if you sit FORWARD on the saddle.
EZ Hydro-Gains® - Double
The Fastest Tested Accross All Riders
Competitor BTS System:
3.1 Watts Slower at 30kph - 3.1 Watts Slower at 40kph - Red
Competitor BTS System:
2.9 Watts Slower at 30kph - 1.2 Watts Slower at 40kph - Purple
Competitor BTS System:
3.5 Watts Slower at 30kph - 4.5 Watts Slower at 40kph and slower then having no BTS - Brown
Watt Saving at 30kph
Watt Saving at 40kph
EZ Hydro-Gains Double 750ml Wove Saddle
EZ Hydro-Gains Single 750ml Wove Saddle
Wove Single Traditional BTS 750
Wove Double Traditional BTS 750
40Kph 3Yaw
EZ Hydro-Gains Saves 2.6 Watts
50Kph 3Yaw
EZ Hydro-Gains Saves 6 Watts
40Kph 10 Yaw
EZ Hydro-Gains Saves 2.5 Watts
50kph 10 Yaw
EZ Hydro-Gains Saves 2.7 Watts
Wind Tunnel Validated ✅
21/04/2026 Tunnel ARC Sports Engineering Jelle Geens, testing three pro's and seven age groupers all showing large gains from the EZ Hydro-Gains®
Testing showed on multiple occasions the EZ Hydro-Gains tested faster
Pro Testing Wind Tunnel Validated ✅
Endless testing now shows that the EZ Hydro-Gains, is the go to hydration system. However, it's not just about being fast it's about being safe!! With ISO manufacture accreditations and protocol strength testing, you know you are not putting your own or anyone else's safety at risk. Purpose built for each saddle and attaching securely.
This is why the best in the world use the EZ Hydro-Gains. With over 400 pro athletes choosing EZ Hydro-Gains, it's probably the most popular rear hydration system in the world of triathlon.
Attached is an average of the savings from the pro triathletes tested, its always lower with athletes who are extremely optimized already and you would expect higher gains from a less aero athlete.
Jelle Geens
Ironman 70.3 World Champion saves 7 Watts +
Casper Stornes Wind Tunnel Validated ✅
Ironman World Champion saved 7 Watts +
The EZ Hydro-Gains®support system for your rear hydration bottles, uses a fin mechanism that contanies an adjustment system for your bottles, so you can adapt your bottles into the perfect position that suits you, the gains come from the bottles being moved to a horizontal position closer to you bottom, also allowing you to access your hydration safely rather then conventional vertical bottles.Verfiried through our own wind tunnel testing and several external sources. Learn exactly how the EZ Hydro-Gains will make you faster, and by how much.Fastest Market Product - (Design Protection)
Wind Tunnel Validated ✅
Flip your bottles YES/NO ? Silverstone Sports Engineering Hub 08/07/26
Independent Testing Engineer: Wind Tunnel Verification: Independent Test Subjects
Its a fine balance like anything in Triathlon one trade of against another, EZ Gains tested flipping the bottles round so the nozzle faces the rider bottom, this might help with bottle ejection and possibly in some cases easier to access, "you will not need to flip the bottle's when using the TriRig cages due to the bottle hold strength" but could become difficult if the bottles are close to the bottom as they should be "in the most aerodynamic position".
Please see the test results
EZ Hydro-Gains®
40kph 0.4 Watts Slower with flipped bottles and nozzle facing the bottom
EZ Hydro-Gains®
45kph 0.8 Watts Slower with flipped bottles and nozzle facing the bottom
EZ Hydro-Gains®
Wind Tunnel Validated ✅
EZ Hydro-Gains Toolbox vs EZ Hydro-Gains, with the Toolbox you have the added advantage of Tools but a slight loss in watts
EZ Hydro-Gains® vs Toolbox
40Kph Athlete 1
EZ Hydro-Gains® vs Toolbox
45kph Athlete 1
EZ Hydro-Gains®vs Toolbox
Athlete 2 40kph
EZ Hydro-Gains®vs Toolbox
Athlete 2 50kph
Consistently Faster than Other Setups - Single or Double Bottle
Hundreds of professionals have tested and approved the EZ Hydro-Gains vs their own highly dialed in set ups and consistently save watts! Below are some examples!
400+ Pro Athletes Some of the Pro's we have had feedback from: Kristian Blummenfelt, Gustav Iden, Sam Laidlow, Caspar Stornes, Kate Waugh, Jelle Geens, Taylor Knibb, Menno Koolhaas, Joe Skipper, Sam Dickson, Fennela Langridge, Danielle Lewis, Steph Clutterbuck, Kristian Hogenhaug, Cam Wurf, Solveig Lovseth, Chelsea Sodaro and so much more endless feedback!!
Faster than Canyon Aerofin
Silverstone Wind Tunnel Tested for a proven 6 watts for professionals!
EZ Hydro-Gains
Unmatched speed in every test. The EZ Hydro-Gains achieves this advantage by positioning its bottles horizontally and directly against the athlete's body. This is the most aerodynamic arrangement possible, effectively closing the gap that typically increases drag on other systems.
Faster than Standard Rear Bottle Holder
Silverstone Wind Tunnel Tested to be faster at all speeds and up to 6.6 watts with only the single bottle setup.
IRONMAN 70.3 WORLDS
Over 30% of the Pro Field at Ironman World Champs Marbella
will be benefiting from the EZ Hydro-Gains system!
This chart (prepared by our qualified aerodynamics engineer, Josh Small) shows the average time savings achievable at Ironman 70.3 Marbella using the EZ Hydro-Gains.
The comparison was made against setups with no rear bottle or a vertical/slightly angled bottle.
While gains may be smaller if you’re already using a more aerodynamic system — similar to what Sam Laidlow previously used — even he’s now upgraded to the EZ Hydro-Gains for maximum performance
When every second counts, aero precision and secure hydration make all the difference.
Testing showed on multiple occasions tested faster
Velodrome Testing
EZ Hyrdo-Gains
EZ Gains Dominates the PRO Field at Kona
EZ Gains — The Most Widely Used Aero Brand at the Ironman World Championships
With over one-third of the pro field using our products, EZ Gains is officially the most popular aero brand at this year’s championships!
This analysis — prepared by our qualified aerodynamics engineer, Josh Small — highlights the average time savings achievable at Ironman Kona using the EZ Hydro-Gains system.
The EZ Hydro-Gains was compared against setups with no rear bottle or a vertical/slightly angled bottle.
When it comes to speed, precision, and reliability — every watt and every second counts.
Worried about bottles falling out?
Watch our real-world durability test
Over 600,000 km of testing. Bottles stay secure.
Latest News
The safest bottle holder system, "bump tested " this is due to the positioning of the cage, its a lot easier for a bottle to fly out of a vertical holder system rather then a horizontal system due to the force it takes to take a bottle out from the side, its almost impossible.
Weight testing to 33lb of weight and they still held firm, over 600,000 kilometres of road testing with 750ml bottles.
Also EZ Gains individually make the saddle clamps "and exceeded some existing clamps" for each seat giving you an exact fit rather then a universal clamp which will never exactly fit your saddle.
Another main factor is, the athletes do not need to lean as far back to grab there hydration, thus giving them more control of there bike when hydrating and exchanging bottles.
"Ironman Triathlon and World Triathlon have confirmed that EZ Hydro-Gains is legal to use in draft–illegal races and conforms to safety standards set out (BSI -ISO9001-ISO14001 5.03 Ironman (World Triathlon) exceeding the standards of a reputable safety standards organization (such as CPSC, ISO, or other equally reputable safety standards organizations)"
Registered designs & trademarks
Mathys & Squire LLP
EZ Hydro Gains Trademark: UK00004217827 / UK4260115
UK/EU EU Design Registration Nos. 015116006-0001 to 0005 and UK Design Registration Nos. 6470173 to 6470177
US Design Protection No. 30/034,780
Australian Registered Design Nos.: 202611699
Registered drawings, as part of a Registered Design application with the Intellectual Property Office (IPO), provide a high level of protection focused on the visual appearance of a product. This legal right gives you a monopoly, meaning you can stop third parties from using, selling, or making products that look the same or similar, even if they did not copy your design.