Reidwrote a review of Continental Grand Prix 4000 S II Tire - Clincher on December 23, 2018
Familiarity: I've put it through the wringer
I admit they have a week sidewall, which has caused me a couple flats. However, I use 25’s and have used nothing else. My rear tire needs to be replaced. The dimples are completely gone and has lost the tire curve. I ride 500+ per month. This has set lasted me all season plus 4 metrics. I have no complaints about these tires at all. I had a sidewall blow out. I took it back to the LBS and it was replaced. Conti had a problem with that batch. Great tire.