The EZ AeroFlow1 BTA is here. It is a between-the-arms hydration system for triathlon and time trial bikes that carries up to 2 litres of fluid, stores your gels and saves 6 to 14 watts. We developed it in the wind tunnel with pro triathletes, then raced it at the IRONMAN World Championship in Kona. Released on 3 November 2026, it is available now.
What is the EZ AeroFlow1 BTA?
A BTA (between the arms) bottle system mounts on your aerobars, between your forearms. This is a fast place to carry fluid on a triathlon bike, because the bottles sit in the air your arms are already disturbing. It also means you can drink without leaving your aero position.
The AeroFlow1 takes that idea further. It combines hydration, gel storage and free speed in one system:
- Up to 2 litres of hydration: a 1 litre upper bottle within the 250mm rearward limit, plus a lower bottle underneath.
- Front gel storage: the aero nose carries 6 to 8 gels, with room left to stash empty wrappers.
- 6 to 14 watts saved: developed through aerodynamic testing to put your bottles in a fast position between your arms.
- Fully adjustable: 40mm stack, extendable to 85mm with risers, plus 10°, 15° and 20° angled spacers to level it up.
Wind tunnel tested, again and again
The AeroFlow1 was not finished on the drawing board. It went through session after session in the wind tunnel at the Silverstone Sports Engineering Hub, with pro triathletes Keith Murray and Jon Breivold on the bike.
A bottle system that tests well on its own can behave very differently once a rider is in position. By testing with real athletes in a real race position, the bottle position, gel storage and shape were refined for how you actually ride, not just how they look on a screen. Check out more information on our science page here.
From the tunnel to Kona
Then it went racing. Jon Breivold took the AeroFlow1 to the IRONMAN World Championship in Kona, carrying his bottles and gels between his arms, right where he could reach them without breaking position.
Kona is one of the hardest tests in triathlon for any hydration setup. Long hours in the heat mean you need plenty of fluid and fuel close to hand, and every time you sit up to drink you lose speed. The AeroFlow1 is built to solve both problems at once.
Why carry hydration between the arms?
For long course triathlon, how you carry fluid and fuel can make a real difference to your bike split. Between-the-arms hydration helps you:
- Stay aero while drinking: no sitting up or reaching down to a frame bottle.
- Fuel consistently: with bottles and gels in easy reach, you are more likely to stick to your nutrition plan.
- Free up your frame: keep your cockpit tidy and your setup fast.
Built for your cockpit
Mono cockpits: the AeroFlow1 suits mono-style setups, including bars converted with the EZ MonoAero Pro.
MJF manufacturing: it is made with professional Multi Jet Fusion (MJF) printing, not desktop FDM printing, for strong parts with consistent properties.
Mounting: it mounts with a standard two-bolt 64mm pattern and must be fitted to a flat, rigid mounting plate with no flex. Watt savings vary with setup.
What's in the box?
- Main AeroFlow1 body (40mm)
- 30mm and 15mm risers
- 20°, 15° and 10° angled spacers
- Fill-in block
- Under-bottle cage riser
- 1 x 950ml bottle
- 1 x 500ml bottle
Kappa cages are not included.
EZ AeroFlow1 BTA FAQs
How much fluid does the AeroFlow1 hold?
Up to 2 litres, using a 1 litre upper bottle and a lower bottle underneath. The box includes a 950ml and a 500ml bottle.
How many gels can I carry?
The front storage holds 6 to 8 gels, with room to stash empty wrappers.
Does it comply with the 250mm rule?
The upper bottle sits within the 250mm rearward limit. Always check the rules for your specific event.
Will it fit my bike?
It uses a standard two-bolt 64mm mounting pattern and needs a flat, rigid mounting plate. It suits mono-style cockpits, including bars converted with the EZ MonoAero Pro. If you are unsure, email sales@ezgains.co.uk with details of your setup.
How much faster is it?
The AeroFlow1 saves 6 to 14 watts. Savings are estimates and vary with your setup.
Get yours now and upgrade
The EZ AeroFlow1 BTA is out now. Hydration, gel storage and free speed, all in one between-the-arms system, wind tunnel tested and raced in Kona.
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