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Aero is one of those words that gets sold to you the moment you take cycling seriously. Deep wheels, a slippery frame, a skinsuit, a teardrop helmet — all of it wrapped up in the same promise: free speed. And the unspoken message underneath is that this stuff is really for the pros, the time triallists, the triathletes. The rest of us are just buying the look.
So this episode asks the honest question. Does aero actually matter for the everyday rider doing club runs and sportives? Or is it expensive nonsense dressed up as marginal gains?
The answer is yes, it matters — but almost certainly not in the way you've been sold it. The biggest aero gains you can make are the cheapest ones, and most riders walk straight past them on the way to the parts they can't really afford.
You Are The Engine And The Parachute
Here's the fact that reframes everything. When you ride along on the flat, the air you're pushing out of the way is the single biggest thing slowing you down. Not your tyres, not your chain, not the bike. Air. And of all the air resistance you're fighting, the bike is the small part. You — your body, sat up there in the wind — are somewhere around 70 to 80% of the drag.
Read that back, because it changes the whole spending decision. The part of the system that matters most for going faster is the part that costs you nothing to change. You don't buy a better body position. You just adopt one.
That's the bit the marketing never leads with, because there's nothing to sell you in it.
Why The Free Stuff Wins
If most of the drag is you, then the single biggest thing you can do is reshape how you sit on the bike. Drop your chest a little. Tuck your elbows in so your arms aren't acting like a pair of open barn doors. Get your hands on the hoods, or into the drops on a fast section, and let your back flatten out. None of that costs a penny and all of it is available on your very next ride.
The second-best-value change is just as unglamorous: wear kit that fits. A jersey flapping in the wind is a brake you've paid for. A close-cut jersey, zipped right up, holds its shape and lets the air slide past. Properly fitted clothing can be worth more real watts than a component upgrade that costs ten or twenty times as much. It's the best-value thing most amateurs never bother to sort.
Only once you've done the free stuff does it make sense to spend. And even then there's an order to it. An aero helmet is decent value and easy to live with. Frames and wheels come last — they're real, but they're the smallest gains for the largest money, and you only feel the benefit when you're already moving quickly.
When Aero Stops Mattering
Here's the honest other side, the part the wheel adverts leave out. Aero is speed-dependent. The faster you go, the more the air fights back — the power you need to overcome drag climbs sharply as your speed rises. Which means the reverse is also true. Slow right down, and aero quietly stops mattering.
That's exactly what happens on a steep climb. You're crawling up at single-figure speeds, there's barely any wind resistance to beat, and the thing you're really fighting is gravity. On that gradient, deep wheels do almost nothing for you, and weight and watts-per-kilo are king.
So the right question isn't "is aero worth it?" in the abstract. It's "what does my riding actually look like?" If you spend your weekends on rolling roads and flat group rides at a decent clip, aero is the best free speed going. If your idea of a good day is a long mountain climb, then weight and your engine matter more, and you can stop feeling guilty about your box-section wheels.
The Trade-Off To Respect
One warning before you fold yourself in half chasing a lower number. The most aggressive position isn't automatically the fastest one. Get too low and too scrunched and you can choke off your breathing, close down your hip angle, and lose some of the power you were trying to put down in the first place. A smaller frontal area is no use if it costs you fifteen watts of engine.
The target is the lowest, narrowest position you can actually hold while still producing your normal power, comfortably, for as long as the ride demands. That's a fit question as much as an aero one, which is why getting your position dialled properly comes before chasing any of the numbers.
Read The Companion Guide
The full written version of this — the rider-versus-bike drag split, the free position changes, the kit that's actually worth buying, and the honest spending order — is in the companion blog post on whether aero matters for amateur cyclists.
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If you want to go deeper on the science, the interview-led pieces are the natural next step. Dan Bigham on the aerodynamics amateurs can actually use is the closest companion — one of the sharpest aero minds in the sport translating it for ordinary riders. Alex Dowsett on marginal gains for amateurs covers what a former Hour Record holder thinks is worth your time and money, and the aero versus weight piece settles the climbing-versus-flat question properly.
For the part that comes before any of it, the one bike-fit change amateurs should make is where position starts, and the triathlon aero position guide is the deep end if you ride a time trial bar.
If you'd rather talk it through with riders working on exactly this, that's what the free Roadman community is for.