Ian whilst I actually tend to agree with you, I mustn't pass up the chance of selling another spoiler to a new customer ;-) Alas I don't think the KC3 comes with a rear spoiler but I may be wrong. Seriously, I have been in karts where the helmet rotates despite being a good fit and correctly fastened. Given that the strap is fabric, it will easily deform even if apparently tight.
I stand by my comment on aerodynamics on bikes. (Pardon me if I use the wrong term). When I asked once whether a slow old codger like me should worry about cycle aerodynamics, it was pointed out that the slower I went the longer I was in the air so should care more than the good guys :-)
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