The Turbo Cottons test around 2-3 watts quicker than the
excellent Conti GP4000s and the only tyres that beat it are
dedicated TT tyres that have very poor puncture resistance.
Why is a low Crr good? Well, a tyre that saves you 2.5 watts is
free speed. Give me an extra 5 watts any day of the week. To
exaggerate things; comparing a set of these tyres to some
Gatorskins will be the same as saving 20 watts… that's like
comparing your form in March to your summer race fitness!
Quick tyres are a much more effective performance improvement
than expensive carbon wheels. Though clearly if you combine these
tyres with cutting-edge carbon rims you have a match made in
They come in three widths; 24, 26 and 28mm. That's fairly unique
in that most brands are pushing 25mm now. Interestingly,
Specialized spec the 26mm tyres on their flagship S-Works bikes. I
have been riding 26 tyres, I would put 24s on a TT bike. Byt to be
honest, am not sure on the 28s - I think if I was going that wide I
would probably be after a slightly more robust and hard-wearing
tyre. But the 26s are perfect.
It is a 320 TPI (threads per inch) construction which means it's
very supple. It has lots of Specialized sounding buzzwords,
"Gripton" and "Black Belt". And no they mean nothing to me
either... All you need to know is that these tyres are sublime;
effortless fast, very supple and grip very well in wet and dry.