Remote CdA Optimisation using CFD

What this adds on top of BioRacer Aero Day or your previous bike fit, track or tunnel session

Remote & repeatable

Moves beyond “looks fast”

Stacks on your previous service

Unique helmet roster

Typical savings: ~~12-24W at race speed
(varies by your baseline, speed and total upgrade budget).

How the “runs” work

Each simulation is one controlled CFD test run. Most meaningful position changes need around 6–10 runs to converge (we test → narrow → confirm).

1. Position optimise

2. Helmet testing

3. Buffer runs

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".

Menu: standard packages

Aero Starter

Low cost

10 runs (position + helmet shortlist)

£225

Best for: “Give me the obvious position gains and an improved helmet.”

1 position optimisation block (typically ~6–7 runs)
Helmet shortlist test (typically ~3–4 helmet comparisons)
30-min debrief call + summary notes
Equivalent Wind Tunnel cost >£600-800

Race-Ready Improvements

Premium Aero

Maximum advantage

30 runs (deep position + helmet tests)

£495

Best for: “I want to maximise my position and test lots of helmets.”

3 position optimisation blocks (typically ~18–20 runs)
Bigger helmet shootout + re-tests (ask if you want full roster pricing)
60-min debrief call + 28-day Q&A messaging follow-up
Equivalent Wind Tunnel cost >>£1500

FIT-CFD

In-person at Southfork Cycles

16 runs (fit check + CFD session)

£350

Best for: “I want my position checked in person, then turned into practical CFD gains.”

In-person session at Southfork Cycles
Bike position check before CFD testing begins
Minimum 3-hour appointment, including a 2-hour CFD session
Posture photos, bike photos and 6 CFD runs completed during the session
10 additional purchased runs used afterwards with rider feedback and race pictures
16 CFD runs included in total

Fast Turnaround

In-season

10 runs (priority booking)

£295

Best for: “In-season quick results, focused on position or helmets.”

In-season quick-results service (position or helmet focus)
Priority booking + faster turnaround
Includes de-brief call + comfort follow-up
10 runs to confirm a change and lock it in

Already a CFD Customer?

Get a cost-effective service using your "twin" already on our system.

Position upgrade: 8 runs optimising existing CFD "twin" £119

Position upgrade: 14 runs optimising existing CFD "twin" £199

Second Bike: 15 runs optimising position £299

Contact us if you have a need for more runs for greater cost effectiveness.

Which helmet position is slower? AiRO CFD helmet-position ranking graphic

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.

1) New to CFD modelling

Aero Starter 10 runs £225

1 position block + helmet shortlist. Fast, practical, strong ROI.

1 position blockHelmet shortlist

Fast Turnaround 10 runs £275

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

Position + helmet shootout with tie-breakers. Big gains without travel.

2 position blocks (typical)Helmet shootoutMost popular

Premium Aero 30 runs £495

More position iterations + deeper helmet testing + tie-breakers.

3 position blocks (typical)Deeper helmet testingMaximum gains

FIT-CFD 16 runs £350

In-person at Southfork Cycles: position check, posture/bike photos, 2-hour CFD session and follow-up runs.

Southfork Cycles3+ hours6 in-session + 10 follow-up

2) Clients already in our AiRO CFD system

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

Want a custom service? Click Make your booking and tell us your needs.

Your build summary

TOTAL RUNS 10

TOTAL £225

A position optimisation typically needs 6–10 runs. With this build you have enough budget for ~1 position block plus a meaningful helmet shortlist.

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've done BioRacer Aero or a bike fit elsewhere we can use some of that data.

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 every month.

Current line up (9.9.2026):

ABUS Gamechanger (pending)
ABUS Timeshifter (Narrow & Wide visor)
Ekoi Pure Aero (M-L)
Ekoi R_Aero (M)
Giro Aerohead
Giro Aerohead II (S-M-L same shell)
HJC Adwatt 1.5 (S,M,L sizes)
Kask Mistral
Lazaer 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)
Scott Split II MIPS (pending)
Specialized TT 5
Specialized Evade 3
Sweet Protection Redeemer
Uvex Race 8 (56-58)
Uvex Ultimate Race TT (59-61)
Trek Bolista (pending)
Van Rysel RCR-X 2 (Classic & 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.