MR
Marcelo Rocha
Brasilia, Brazil
"AeroX lets my clients see the impact of every adjustment in real time. It's become essential in my sessions."
Bike Fitter — 16+ years experience, Guru Academy Instructor
marcelorocha.com
For bike fitting professionals
Your fit improves performance.
Show it to your clients.
AeroX measures your client’s frontal area during the session and turns every adjustment into watts and km/h. A webcam, a trainer, two minutes of setup.
- Visible result
- Live measurement
- 2-minute setup
45-min online demo · Live Q&A · Free, no commitment
AeroX is aerodynamic measurement software for bike fitters. A webcam films the rider head-on on the bike; AeroX computes the frontal area frame by frame and turns the difference between two positions into watts and km/h. It complements the postural fit, it does not replace it.
What AeroX changes for your studio
Prove the value of your fit
Your client sees live what each adjustment gains them, in watts and km/h. Your work no longer rests on their impression alone.
Stand out
Add a measured aerodynamic analysis to your offer, in your studio, without heavy equipment: the service your triathlete and time-trial clients are looking for.
Bring clients back
Positions and measured differences stay in the client's AeroX space. If they use AeroX at home, you follow their progress and prepare the next session.
Keep your way of working
A webcam, the client's bike on a trainer, two minutes of setup. You fit as usual, AeroX adds the measurement.
A comparison, not an isolated number
You record the client’s usual position, then change one setting. The screen shows the change live. The question is no longer “is it better?” but “does this setting save watts?”
- Bar and stem
- Aero bars
- Arm width
- Hand placement
- Head position
- Torso angle
- Saddle height
Before After
Starting position0.52 m²
Tested position0.36 m²
Gains in numbers
Position 1 → 5, at 30 km/h
- −31%
- Frontal area
- −53 W
- Saved at 30 km/h
- +3.9 km/h
- At equal power
- −9 min 12 s
- Over 40 km (13.8 s/km)
0.52 → 0.36 m²
30.0 → 33.9 km/h
Real captures from the app, same rider. The coloured area is the silhouette detected by AeroX: it is what the frontal area is computed from.
Figures for positions 1 and 5 shown further down (“What position changes, measured”): same rider, computed at 30 km/h with constant shape.
Without AeroX
- You adjust.
- You have to explain and justify everything.
- Your client does not know whether they will be faster.
With AeroX
- You fit as usual.
- Your client sees their position change live.
- They know what they gain in watts and km/h.
Four readings, live
Frontal area (A)
The rider’s surface exposed to the air, computed frame by frame from the silhouette filmed head-on. It is the aerodynamic lever that position controls.
The difference in watts
The power saved between two positions, at the same speed. The calculation assumes a constant aerodynamic shape: only the change in area is taken into account.
Speed and time gained
Computed at your client’s actual power: the same drop in area does not have the same effect at 180 W as at 280 W.
How the position holds
How the area evolves through the session: you see whether the position degrades with fatigue.
AeroX compares positions for the same client, under the same conditions. The difference is what matters, not an isolated value.
What AeroX measures, and what it does not
This level is designed to compare positions during a session, not to provide a lab value.
3 %
repeatability on frontal area
Two measurements of the same position agree within 3%: that is what makes comparison possible.
10 %
absolute accuracy
Possible gap with a lab measurement. Enough to compare, not to certify.
AeroX measures
Frontal area
Frame by frame, from the silhouette
Difference between two positions
Tested under the same conditions
Watts and km/h
Estimated from the measured area
AeroX does not measure
Aerodynamic shape (Cd)
Helmet, clothing, airflow: poorly reflected or not at all
Outdoor conditions
Real wind, crosswind, drafting
Comfort and biomechanics
That is your expertise as a fitter
What makes the result vary
- Client stability
- Camera distance and alignment
- Lighting
- Clothing
A single measurement means little: compare two positions tested under the same conditions.
A decision aid, not a replacement for your expertise
Saddle position, setback, cleats, mobility, pelvic stability, comfort: your fit remains the framework. AeroX adds one more measurement to check that a setting really improves the position without degrading the rest. The decision stays yours.
Sustainable, not extreme
A position that wins on screen but that the client cannot hold saves no time on the road. AeroX tracks frontal area throughout the session: you see whether the position degrades with fatigue. Breathing, comfort and power remain your judgement as a fitter; AeroX brings the measurement.
The session in four steps
1
Record the starting position as reference
Webcam about 1.30 m in front of the bike, two-click calibration (≈ 2 min the first time). You record your client's usual position: that is the reference.
2
Fit as usual
Saddle, bar, aero bars, hand placement: you follow your method. AeroX tracks the silhouette continuously.
3
Measure and compare each adjustment
Each change is compared with the reference, in frontal area, watts and km/h. You see at once what gains and what loses.
4
Deliver the aero report
Starting position, chosen position, difference in watts, km/h and time: your client leaves with their numbers.
They already use it in their bike fits
Bike fitters in Brazil and the United States.
MM
Marcelo Muniz Machado
Uberlândia, Brazil
"My clients leave with concrete data. Retention has changed since I started using AeroX."
Bike Fitter — Saúde M3 Bike Fit, IBFI certified
saudem3bikefit.com.brMG
Mark Gerlando
Traverse City, Michigan, USA
"I've been fitting bikes for 20 years. AeroX is the first tool that lets me quantify aero gains live during a session."
Founder of Ride Science, Serotta certified
ridescience.comWhat you will be able to explain to your clients
- 1
Speed is not only about power
On a bike, the faster you go, the more the air holds you back. On the flat with no wind, it already accounts for about 78% of the resistance at 25 km/h, and over 90% around 45 km/h.
- 2
Position is the main lever
Within that resistance, the rider’s body weighs far more than the bike. Elbows, head, shoulders, bar width: these are settings you control.
- 3
What it changes in the session
Two clients with the same power do not ride at the same speed. You know it; your client has to take your word for it. AeroX replaces the impression with a measurement they can see.
Computed on the flat, no wind: rider and bike 80 kg, CdA 0.48 m² (upright road position), rolling coefficient 0.005, air at 1.225 kg/m³. A slope, wind or a lower position change these values.
| Speed (km/h) | Air share |
|---|---|
| 15 | 57 % |
| 20 | 70 % |
| 25 | 78 % |
| 30 | 84 % |
| 35 | 88 % |
| 40 | 90 % |
| 45 | 92 % |
| 50 | 94 % |
What position changes, measured
Six positions of the same rider (1.78 m, 72 kg), measured with AeroX. From upright torso to aero bars with head tucked, frontal area drops by 37%.
- 1
Upright torso, straight arms, hoods
0.52 m²
reference
- 2
Inclined torso, bent arms, hoods
0.48 m²
−8%
- 3
Flat torso, hands in the drops
0.44 m²
−15%
- 4
Flat torso, forearms horizontal
0.42 m²
−19%
- 5
Aero bars, head up
0.36 m²
−31%
- 6
Aero bars, head tucked
0.33 m²
−37%
Reading: at 35 km/h, going from position 1 to position 4 means about 53 W less to produce (constant-shape calculation). These are one rider’s measurements, not an average: your client’s differences will be their own.
Source: O. Demichel, “S’entraîner à l’aérodynamisme” (2026), tables 2.1 and 2.5.
For which clients
Road cyclists
More efficiency on the flat and in pulls, without an extreme position.
Triathletes and time-trialists
Set up aero bars while preserving breathing and the ability to hold the position.
Racers
Put a number on a specific change before a race.
Sportive riders
Gain speed at equal power, in a position they can hold for hours.
Clients prone to pain
The measurement helps choose between comfortable positions; a position that creates strain is never kept.
Grow your business
AeroX is not only for one-to-one sessions.
Group aero studies
With the Unlimited plan, analyse a club, a team or a group of athletes with no per-analysis cost. A new clientele, beyond one-to-one fitting.
Directory of AeroX-certified partner bike fitters Coming soon
Partner studios will be listed in a public directory on aeroxbefaster.com: cyclists who discover AeroX will be able to find an aero analysis near them.
A web page to present your aero analysis Coming soon
A ready-to-adapt page template to present your service to clients: what you measure, how, and with what limits.
Pricing
Clear pricing, tailored to every bike fitter
Start with a 14-day free trial, then keep the plan that fits your studio’s pace.
Plans available on 1 November 2026.
Exclusive offer 14 days free
Unlimited
For studios that offer aero to every client.
€69 excl. VAT/month
until 31 December 2026, then €99 excl. VAT/month
€3.45 excl. VAT per analysis at 20 analyses a month
For the first 20 studios only.
€690 excl. VAT/year
for the first year (subscribe by 31 December 2026), then €990 excl. VAT/year
2 months free
For the first 20 studios only.
€99 excl. VAT/month
€4.95 excl. VAT per analysis at 20 analyses a month
€990 excl. VAT/year
2 months free
- Real-time evaluation of the aero gain
- Up to 10 positions or setup changes measured per client
- A card of your client’s improvements to share on social media
- Your clients learn how to ride faster
- Unlimited clients
- We install your setup with you over video call
- No commitment
14 days free
Essential
To start offering aero in your studio.
€20 excl. VAT/month + €15 per analysis
- €15 excl. VAT per analysis, billed at the end of the month
- Ideal for up to 3 analyses a monthIdeal for up to 5 analyses a month
- No commitment
- We install your setup with you over video call
- Monthly group video call: new features and questions
Which plan is right for you?
- 4 analyses a month or more6 analyses a month or more
- Unlimited
- 1 to 3 analyses a month1 to 5 analyses a month
- Essential
14-day free trial on every plan, starting when your setup is installed. You save a bank card and nothing is charged before the trial ends: cancel from your account before then to pay nothing. One trial per studio.
Book your demo
Studio chain, federation, several locations? Request a quote
Pricing questions
What counts as an analysis?
An analysis is one client analysed with AeroX. It is counted only once per rolling 30-day period: re-tests of the same client within those 30 days are free, however many sessions you run.
How does VAT work?
Prices are shown excluding VAT. VAT is calculated at checkout based on your country. If your business is established in another European Union country and you enter your EU VAT number, the invoice is issued under the reverse-charge mechanism, without VAT.
Can I cancel at any time?
Yes. Every plan has no commitment and can be cancelled from your account. During the trial, cancelling before it ends means nothing is charged. After that, cancellation takes effect at the end of the period already paid. Moving to a higher plan is immediate and prorated; moving to a lower plan takes effect at the end of the current period.
How do I get my invoices?
Every payment generates a PDF invoice. All your invoices can be downloaded from your account, under “Manage billing”.
What if a payment fails?
Your access is kept for 7 days while you update your payment method. After that the account becomes read-only: your data stays available, and new analyses resume as soon as the payment goes through.
How does the free trial work?
You choose your plan and save a bank card, with no charge. We then install your AeroX setup with you: the 14-day trial starts that day. Unless you cancel before the end, the plan starts and the first payment is taken. One trial per studio.
Frequently asked questions
Practical
What equipment do I need?
A webcam (720p minimum) and the client’s bike on a stand. Your laptop webcam is enough; a smartphone camera over Wi-Fi also works. AeroX runs on macOS and Windows.
Do I need a smart trainer?
Not for frontal area measurement alone. A Bluetooth FTMS smart trainer is needed to link power to position and for Speed mode. Unsure about your model? Write to us.
Is training needed?
A 30-minute video onboarding is included: setup, calibration and aerodynamics applied to fitting. A group video call then takes place every month.
Can my clients carry on at home?
Yes. If they use AeroX on their trainer, they find their data and you follow their progress between sessions.
In depth
From what speed does aerodynamics matter?
On the flat with no wind, air already accounts for about 78% of the resistance at 25 km/h (assumptions under the chart above). And the time gained per kilometre is larger for a slower rider: at 20 km/h, the same position improvement saves about twice as many seconds per kilometre as at 40 km/h.
Why measure frontal area rather than CdA?
Drag depends on frontal area (A) and body shape (Cd): CdA = Cd × A. For a given body, frontal area is the first lever position controls, and it is the one AeroX measures. Cd requires specific tests on a track, on the road or in a lab.
Understanding CdA →Are the displayed watts an absolute measurement?
No. They are estimates computed from the measured area, assuming the shape (Cd) does not change. Differences between two positions are reliable under the same conditions; the absolute value less so: the area is accurate to within 10% and the real shape can vary from one position to another.
Is the goal to be as low as possible?
No. A good aero position stays breathable, stable and sustainable for the whole race.
In short
- Measures the client’s frontal area live, with a webcam.
- Turns every setting into watts, km/h and time.
- Compares positions under the same conditions: 3% repeatability.
- Extends the session at home and lets you follow up between appointments.
- Fits into your bike fit without replacing it.
See AeroX live
See AeroX live in a 45-minute online demo and ask all your questions.
Chains, federations, several locations: ask for a quote.