Cycling is dominated by aerodynamics — across every discipline. Using the Streamlines CIRRUS system we measure your drag in the real world, on roads you actually ride, then iterate kit and position until the numbers say you're fast.
ALTOSTRATUS, FORMA, TEMPO and the NIMBUS data logger mounted to your bike. Power meter required.
Straight, low-traffic course with under 1% gradient — a quiet local road or cycle path near you.
Repeat the course while we swap positions, helmets, suits and wheels. Wind & yaw logged live.
CdA per run on the CIRRUS portal. Written report and a 60-min review call to lock in changes.
We test using CIRRUS — the real-world aerodynamic drag measurement system from Streamlines Aero. It measures drag to within 2 watts on everyday roads, not a wind tunnel, so we can iterate your position and kit on the courses you actually race.
About the CIRRUS system →“Testing with Streamlines makes it possible to test and train on the spot and give instantaneous feedback on aero gains.”Mathieu Heijboer · Head of Performance, Visma–Lease a Bike
Every change is tested on the road and measured directly — so the numbers in your report are your own, not a rule of thumb.
One 2-hour CIRRUS session on a local course. Baseline your current position and kit.
Two sessions, one to baseline and one to validate. Most popular. Full position iteration.
Three sessions sweeping position, helmets, suits and wheels — race-day setup, locked.