Staying hydrated and saving time are essential, but choosing a suitable rear hydration system can be tricky, especially as systems can now carry spare tires, tools and CO2’s. XLAB, the world’s largest supplier, with the widest range of models and 15 years of experience, offers some helpful tips.

1. Aerodynamics
Bicycle drag consumes around 30% of your energy, so the exact position of the system is critical. This is why XLAB’s Aerospace engineer used the ‘SLIPSTREAM’ vest in the Wind Tunnel to position the XLAB CARBON WING and SUPER WING systems to have the lowest drag of any system available! They are positioned in the turbulent air behind the rider’s rear reducing drag.

2. Aero Seatposts
Air originating in front of your thighs travels between and around them. Aero seatposts allow air to pass through virtually unrestricted. Mounting a system that hangs down behind the post in laminar air defeats the purpose of an aero seat post and can increase drag.

3. Carry Little or Lots?
For repair, carry two CO2s but do NOT store them inside a folded tire as this can cause tire damage. Carrying a tubular in a bag protects it from UV light and debris reaching the glue. Some systems mount CO2s and inflator on the outside of the system allowing a Mini bag to carry cell, cash, keys, tools, etc.
These icons show what a top end system can carry.

4. Easy To Use
At first, rear systems may seem slightly awkward to use, but XLAB systems are adjustable and the position has been refined over 15 years, making them the #1 choice Worldwide.

5. Strength
Ultra light systems can often result in failure, and can rock from side to side, consuming your valuable energy. XLAB systems are up to 4 times stiffer than others.

6. Bottle Cage Selection
Bottles will eject if the appropriate cages are not selected, whether the system is carbon or alloy. Cages to consider are the Alloy Elite Cuissi, Titanium King and Carbon XLAB.

7. Test of Time
More Ironman World Championships have been won using XLAB hydration/inflation systems than all others combined.

I hope you have found this guide useful.
Craig Turner—Aerospace Designer and XLAB Founder.