McLaren MP4-25 Appendage

… What on earth this structure is that’s attached to Jenson Button’s McLaren MP4-25???

This picture was snapped by AUTOSPORT on the opening day of pre-testing at Jerez. Now, I’ve seen plenty of odd devices attached to cars during testing, but this certainly ranks up there!

But what is it? A tyre temperature sensor? An anti-overtaking system? Something to damage other cars with? Somewhere to hang Button’s ego jacket?

Answers on a postcard, please!

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Richard Bailey

Founder & Chief Editor at MotorsportM8
Hasn't missed a Grand Prix since 1989. Has a soft spot for Minardi. Tattooed with 35+ Grand Prix circuits.