Timothy Yeghianwrote a review of Continental Grand Prix 4000 S II Tire - Clincher on August 18, 2017
Familiarity: I've put it through the wringer
If companies would drop all the superlatives and tell the truth, they would get better grades in school. However, as they come out with all the VooderSpraken, and if that widget does not go pop, fizz and zaggle, then they are going to take their C+ home to their mum. This tire is an exception. I am 63 years old, how would you feel about your grandfather turning a racing bicycle at 35 miles an hour in the rain on tires that "might" hold that road? Ops, it rained, oh well. These tires are the best all rounders I have ever put to a set of rims. My carbon fiber bicycle is fantastic, but it in truth doesn't really like going over 35mph. At 35mph my bicycle starts to turn into a government worker. That is where it starts to do the Hula. Oh, don't get me wrong; it keeps going, but I don't get too squirrely with it. My insurance against that is this set of tires. Brilliant, and you have to look at how Continental worked the margins to achieve this performance. I will give you a hint. Everybody knows that wind can hit a tire head-on. Okay, what happens when the bicycle is in a turn, heeled over like a 20 million dollar yacht, and the wind, - weird, is actually hitting the tire from the side? If all the tires are designed to "head into the wind" then what happens if one tire company works those numbers like a Japanese high school student trying to get into Tokyo University, and thus also works to maximize aerodynamic efficiency when the bicycle is laid over at speed like a 4 weight fly rod hooked into a King Salmon? In the straights, about the same, yet in the turn, who is going to exit every turn with an X% advantage? Look at the tire closely and their solutions are simple, but pure genius.