LATEST OCTOBER CLIENT - "Shocked" to get 28watts less drag at race speed 47kph

CdA Optimisation:
use CFD to take your aero to another level

FIT IT. TEST IT. PROVE IT.

Starting with a bike fit in person or an existing race position sent in remotely, AiRO tests what works.
Your position, helmet and equipment choices are compared using measurable CdA evidence.

Find genuine aero gains without unnecessary cost, travel or guesswork.

CFD TESTIMONIAL 01

"New position is so much more comfortable, and amazingly, more aero. Peace of mind that the changes didn't make an already aero position slower. I've been able to compare race pics to CFD model positioning to check against watts saved (am I really riding as aero as I think?). I knew the Rudy Wingdream helmet was fast as pros were using it; using CFD I saw a 34 watt save, totally justified the cost, I don't think I would have bought it without seeing the watt saving!"

— Dannie Hayes • Triathlete
4th A/G 70.3 Swansea 2026

CFD TESTIMONIAL 02

"I was really excited to have the opportunity to get involved in CFD testing. My TT helmet had served me well but it was in need of changing so having the ability to take the guess work out of choosing a new one was great. This combined with some small positional changes has helped lower my CdA and placed me in a more comfortable position. It was also a very positive and rewarding experience."

— Debbie Sheridan • Time Triallist
European TT Champion (70-74),
BC British Masters Champion (combined 65-74) &
CTT/RTTC 10-mile A/G(65-69) Champion 2026

1. Choose your package ↓ See CFD vs Wind Tunnel Report Read FAQs

What AiRO CFD adds to a bike fit, existing race position, track or tunnel session

  • Remote & repeatable
    • We run CFD (computational fluid dynamics) using "cloud" super computers to analyse your photos, fit dimensions and position data.

  • Moves beyond “looks fast”
    • You get measurable CdA "evidence" to choose position & helmet.

  • Stacks on your previous service
    • Perfect after a bike fit, track, tunnel or DIY aero session — we use the position you already have as the starting point.

  • Unique helmet roster
    • Access to 26 helmet options likely to be ABUS, Kask, Met, Poc, Scott & Trek coming.

Typical savings: ~~12-24W at race speed
This varies by your baseline, speed and total upgrade budget).
e.g. October 2026, TT rider, races @ 47kmh, saved 25-29 watts.

How the “runs” work

Each simulation is one controlled CFD test run. We start with your position, your goals and any comfort or race constraints, then use what each run tells us to decide the most useful next test. There is no fixed recipe.

  • 1. Find the best line of action
    • That might be reach, elbow position, head/shoulder posture, helmet choice or another detail that stands out from your baseline.

  • 2. Test → learn → refine
    • We use the CFD evidence to guide the next change rather than forcing every rider through the same number of positions or helmets.

  • 3. Fast AND rideable
    • The aim is not to put everybody into the same position. It is to find the lowest-drag position and equipment choices that you can actually hold at race effort.

Remote means you can do this from home - no travel and easy to run more sims 6 weeks or 6 months later, upgrade or look at new helmets in the menu when they arrive.

This service is ideal if you’ve already had a standard bike fit with only visual aero advice that it "looks fast" or the helmet is "looking quick".

Build your package

Pick what you want, see exactly how many runs you’re getting, no price surprises.
Click “Make Your booking” and it will generate an email for you to complete.

Aero Starter 10 runs £225
10 runs used where your baseline suggests the biggest practical aero gains are available.
Evidence-ledPosition / helmet / both
Fast Turnaround 10 runs £295
In-season quick results service: focus on position or helmets, with priority booking.
Priority booking De-brief call Comfort follow-up
Race-Ready Improvements 20 runs £375
20 runs with room to follow the evidence into position, helmet and useful confirmation tests.
Flexible testingFollow the evidenceMost popular
Premium Aero 30 runs £495
Maximum scope to investigate the changes that matter most for your individual aero setup.
Deep investigationPosition + equipmentMaximum gains
FIT-CFD 16 runs £350
In-person at Southfork Cycles: assess the rider, run CFD and let the findings direct the session and follow-up work.
Southfork Cycles3+ hours16 flexible runs
Position upgrade (8) 8 runs £125
Follow-up optimisation on your existing CFD twin (focused position & helmet tweaks).
Existing twinCost effective
Position upgrade (14) 14 runs £199
Follow-up optimisation on your existing CFD twin (focused position & helmet tweaks).
Existing twinVery cost effective
Second Bike set-up (same rider) 15 runs £299
Optimise your position on a second bike (e.g. TT/Tri done and you want Road/Gravel optimised).
Existing twinSecond bike
Deep Sweep 30 30 runs £425
Elite-level incremental CFD optimisation for riders already in the AiRO system and already close to a good position.
Existing twinSmall-step sweepsLast few watts
Want a custom service? Click Make your booking and tell us your needs.

Your build summary

TOTAL RUNS 10
TOTAL £225
Your run budget is used flexibly. We start from your baseline and direct the runs towards the changes that show the most useful aero potential — position, helmet or a combination.
What you’ll provide us:

Fitting measurements, side/front photos (short video optional), race target (distance/watts/time), and any constraints (comfort, UCI, Sprint Tri Draft legal, etc).

If you’ve done CFD before we can use your "twin".
If you have previous bike-fit or legacy BioRacer Aero data, we can use any useful measurements as part of your starting point.

2. Make your booking

Clicking "Make your booking" produces a pre-filled email for you to complete additional details, add position pictures/video and then send it to us.

FAQs

What does it mean by a riders CdA?

In simple terms: “A” is your effective frontal area; “Cd” is how cleanly air flows around you and the bike. The product is CdA - your “how hard it is to push through air” number. This service is about choosing the setup that produces the best CdA outcome, while staying comfortable and sustainable.

Is this service remote only?

Remote is the default for the standard CFD packages. FIT-CFD is the in-person option at Southfork Cycles: position check first, then a 2-hour CFD block, with follow-up runs used afterwards.

What is the up to date Menu of helmets?

We can do anything from a shortlist to the full roster. A typical “shootout” is ~10 helmets, then re-test the top few if needed.
Premium Aero gives room for deeper helmet testing and tie-breakers; if you want the full roster, just tell us and we’ll quote the runs needed.
New helmets are being added regularly.

Current line up (21.10.2026):

ABUS Timeshifter (Narrow & Wide visor)
Ekoi Pure Aero (M-L)
Ekoi R-Aero (M)
Giant Rivet M Visor
Giro Aerohead
Giro Aerohead II (S-M-L same shell)
HJC Adwatt 1.5 (S,M,L sizes)
Kask Mistral
Lazer Volante KinetiCore (M)
MET Codatronca (L)
MET Drone Wide Body II (M)
Oakley Velo TT (S-M-L)
POC Cerebel (M)
POC Tempor
Rudy Project The Wing (S-M)
Rudy Project Wingdream (S-M)
Specialized TT 5
Specialized Evade 3
Sweet Protection Redeemer
Uvex Race 8 (56-58cm)
Uvex Ultimate Race TT (59-61cm)
Van Rysel RCR-X 2 (M/L Classic Visor & M/L Cut Visor)

How big are the gains really?

Many athletes see meaningful improvements—often around ~20-25W at race speed when you combine position + helmet + tidy details. Your results depend on baseline position, speed, constraints and what you’re willing to change.

What do I need to prepare?

Your position measurements, a few photos/video angles, race target, your current helmet details. You will be sent a link to a webpage where you fill in all your measurements and requirements.

What is Deep Sweep 30?

Deep Sweep 30 is for riders who are already in the AiRO system and already have a strong position. Instead of making only large obvious changes, we systematically move through small increments around your current best setup — for example elbow width, elbow height, hand height, reach/fore-aft and head/neck position. We first identify which directions improve or worsen drag, then refine around the promising zones and use the final runs to test useful combinations. The aim is to find gains that can remain hidden when a position already looks fast.