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Wheels Within Wheels

It looks as if Ferrari-style wheel inserts are indeed going to be used by other teams in 2007, if this photo of the Renault in testing is anything to go by.


Although a protest was never mounted against the inserts, it can hardly be denied that they serve an aerodynamic function, whether or not they assist in brake cooling. This is the official F1 site’s view on the matter:

Ferrari 248 F1 – brake cooling drums

This interesting feature used in Malaysia is an evolution of similar devices seen on cars last year, but Ferrari have taken it to its extreme. The cooling drum not only covers the brake disc and calliper, preventing heat being transferred to the wheel rim, it also creates a seal of sorts with the wheel itself. It completely fills the space inside the wheel rim, not only improving brake cooling, but also dramatically reducing the vortices generated by the rotation of the wheels, hence making this area more aerodynamically efficient.

At least that is an admission that the inserts do have an aerodynamic effect. I suppose the argument is that this is not their primary purpose; they are there to keep the wheel rim cool and any aerodynamic effect is purely incidental. Which is fine until you notice that the inserts are used only on the rear wheels.

Something seems wrong there – the front brakes do most of the work as all the weight of the car is thrown forward as soon as it begins to decelerate. And that means they get hot, considerably hotter than the rear brakes. Surely any heat protection for the wheel rims should appear on the front wheels first; and, if the system is that effective, why not put it on all the wheels?

Of course, the wheel wells on the rears are much deeper than on the fronts and so they produce stronger vortices and drag and this would argue for putting the inserts at the back before bothering with the front. But would not that call into question the primary intent of the inserts? It is all very mysterious.

Not that it matters, of course. If everyone is going to use them, the playing field is level and we can forget the whole business. But it does make me wonder what the next dubious brush with the regulations will be. That’s part of the fun of F1 after all – watching the engineers and designers slip their tweaks past the FIA.

4 Responses to “Wheels Within Wheels”

  1. Two things about the wheel disks:
    they are just one of the many technical advances that have stemmed from racing since the beginning – rear-view mirror, electronic ignition, ABS, traction control, etc.
    when I was a kid, about half a century ago, it was very popular among the hot rodders to put full-wheel-covering polished or anodized aluminum disks front and rear… as they did on the salt flats etc. in the “lakesters” of the time, going for land speed records.
    Personally, I was racing an AC Bristol at Mostport Park.

  2. Blimey, Barry, you must be almost as old as I am! An AC Bristol, that brings back memories…

    In my time I have seen innumerable technical advances on the cars – and wheel disks are nothing new, as you say. It’s just that excusing them as “brake-cooling measures” seems a novel argument to me, very similar to Gordon Murray’s explanation of the fan car Brabham needing the fan for engine cooling.

    I’m not against the wheel disks or other innovations – racing should always produce clever ideas to make the cars go faster. And the other teams will copy anything that seems to work for someone else anyway.

  3. I always used to take the FIA-Ferrari conspiracy theorists with a pinch of salt, but it does rather seem as though innovations in F1 are welcome (even where they stretch the interpretation of the rules to the limit) only when Ferrari come up with them first…

  4. Bernie admitted a while back that Ferrari were the only team to get “political support from the FIA”, Patrick. And those are his exact words…

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