Speed without extra watts.
At speeds above 30 km/h, aerodynamic drag is your biggest enemy, consuming 80%+ of your energy. With aero testing, we find the watts you're leaving on the table.
The math of speed
At 40 km/h you need ~250W just to overcome air resistance. Reducing CdA by 5% means saving ~12W or ~1 min/40km in a time trial.
For triathletes and TT specialists, aero optimization is often the fastest way to gain time. While improving MLSS by 5% requires months of training, you can improve CdA in a single day with better position and equipment.
Example: 40km time trial @ 300W
Difference between 0.300 and 0.260 CdA = 2:49 min without a single extra watt!
Components of aerodynamics
Every element contributes to the total CdA.
Body + position
Your body is the biggest source of drag. Position on the bike, head height, shoulder width.
Bike + wheels
Frame, fork, handlebars, saddle, wheels — every element has an impact.
Helmet
We compare helmets, wheels, clothing...
Clothing + gear
Aero suit, different materials, aero socks, shoes, race number — everything counts.
How testing works
Field test with precise measurements.
Baseline
We measure your current CdA in your standard position.
Position
We test position variations (lower/higher, wider/narrower).
Equipment
We compare helmets, bikes, clothing...
Optimum
We validate the best combination with multiple repetitions.
Report
We document results and recommendations.
Location: We conduct the test on a flat road with minimal traffic. We need at least 1km of flat terrain and favorable weather conditions (low wind). For even greater accuracy, the test can also be conducted on a velodrome.
Aero testing packages
Basic Aero
Baseline CdA + position optimization.
- 2 hours of testing
- Baseline + position + equipment
- 3-5 variations
- PDF report
- + velodrome rental
Full Aero
Complete aero package with equipment testing.
- 4 hours of testing
- Baseline + position + equipment
- Up to 10 configurations
- Video analysis
- Detailed report
- Each additional hour 90€
- + velodrome rental
Aero Fit Combo
Aero Fit + Aero testing in one package.
- Aero fit (variation preparation)
- Full Aero test
- Complete documentation
- Video analysis
Frequently asked questions
Professional TT specialists achieve CdA 0.200-0.220. Good amateurs on TT/triathlon bikes are typically in the 0.250-0.300 range. On a road bike, expected CdA is 0.280-0.350.
With modern power meters and proper methodology, we achieve ±1.5% accuracy in the field and under ±1% on a velodrome. This is sufficient to identify differences between configurations.
Your bike, a power meter (essential!), and all equipment you want to test (helmets, bikes, clothing...). We also need favorable weather conditions.
Not necessarily — a road bike is equally relevant. However, the potential for improvement on a TT bike is greater, as it has more adjustable aerodynamic equipment.
Find your free watts
Book an aero test and discover how much speed you're leaving on the table.