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The Continental Grand Prix SuperSonic Clincher Tire is the burger without the bun. Or more like the chicken breast without the skin. It's pure, unadulterated meat, only in this case we're talking rubber, not post-race calories. Yes, race, because the SuperSonic is a competition-only tire with the genes of the mighty GP 4000s minus that tire's protective Vectran belt, beefy shoulder profile and Tread Wear Indicators (TWI). That makes the SuperSonic more vulnerable, yes -- but so ethereally light (140-145g, depending on size) you'll shave 200g off your bike with a simple tire change.
Pair these tires with ultra-light butyl inner tubes to reap the performance benefits. Or you can go one further and use latex inner tubes. Then you'd be looking at less than 200g per wheel, which is below the weight of most tubulars, and way more convenient, too.
With all that's been subtracted, what's left? Plenty. A casing of 330 TPI (threads per inch) yields a supremely supple ride. Here's a simple tire lesson: Think of TPI as a cross hatch of threads -- known as on-the-'bias' construction, from bead to bead -- and you understand that the more strands per inch, the tighter the structure, and that enables the tire to conform more easily to the road surface, rather than "catch" on the pavement's millions of imperfections.
Lastly, even though the Grand Prix Supersonic is essentially a racing slick, it retains Continental's motorcycle-developed Black Chili rubber compound, which contains minute bits of carbon that enhance the speed at which a tire can deform, allowing more stable cornering grip, which also results in less of that scary drifting sensation during high-speed cornering. Also, by providing a sort of loose matrix for the rubber to cling to, Black Chili improves wear, reducing micro-tears caused during quick transitions or when laying the bike over for a long sweeper.
The Continental Grand Prix SuperSonic Clincher Tire is available in 700x20c and 700x23c in Black/black only.
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Conti Supersonic - wicked fast
These bad boys are wicked fast. I put them on and pumped them to 150psi, and they were still 4oz lighter than my other tires at 120.
They were rock hard and reminded me of aircraft tires. Solid!
Then I got on my bike and rolled down my local hill and scared myself I was going so fast.
The bike seemed to have no wheels at all, the rolling resistance was so low.
Of course, these things are not going to last long coz they are much thinner than training tires, but at the higher psi, they actually seem more solid and less likely to get a puncture.
Anyhow, I can't wait until my race, coz these are going to make a difference, but I am not going to waste them on training rides.
So, if you are racing, you owe it to yourself to get these.