The system Ironman banned on debut
When Vincent Luis lined up at Ironman Texas with the Aero BTS PRO behind his saddle, race officials pulled it before the race. They hadn’t seen anything like it. It has since been reviewed and fully approved by World Triathlon and Ironman. The data didn’t change.
Why the PRO is faster than the standard BTS
Both the PRO and the standard Aero BTS use the same wide V-formation and the same saddle clamp. The PRO shell goes further: it hugs the bottles more closely, reducing the exposed surface area between them and tightening the wake profile. That tighter geometry earns 1–2 W over the standard BTS — and the standard is itself already 1–4 W faster than two bottles mounted close together (n=17 athletes, 45 km/h, 0° yaw, AeroGain velodrome testing).
Why a wider V is faster
Behind the saddle is already a fast place for a bottle — it sits in the rider’s wake, partially filling the low-pressure void that would otherwise drag the rider back. Stacking two bottles close together leaves drag on the table by overlapping their wakes; opening the spacing into a wide V lets each bottle work independently. For front hydration, see our front-bottle BTA system.
900 ml of integrated storage
The PRO tray holds 900 ml — 100 ml more than the standard BTS — and fits two inner tubes, two CO2 cartridges, a pump, a tyre lever and a multitool. Most TT and triathlon frames have no integrated storage. The PRO carries the full spares kit without adding aerodynamic exposure.
Bottle access on the move
The wide V lets you mount bottles facing inward, so you pull toward your body rather than reaching back blind. Safer on rough roads, faster through aid stations.
The white logo
The PRO ships with a white AeroGain logo — designed to sit cleanly alongside the Aero Cockpit’s white colourway. A detail, but one that matters when the rest of the build is right.
Eight saddle fits
Available for Wove V8, Gebiomized Stride, Prologo T Galle TT, ISM PN3.1, Specialized Sitero, Dash Integrated seat post, Selle Italia Watt Superflow, and Fizik Transiro Aeris. The next saddles are decided by the community — follow us on Instagram to put yours forward.
Aero numbers from AeroGain in-house velodrome population testing, n=17 athletes, 45 km/h, 0° yaw. Full whitepaper available on request.
