Continental Grand Prix 4000S review

I currently use a set of Continental GP4000S on my race bike.

I recently had a series of punctures to the same tyre. The first puncture happened when the tyre was mounted on the back.

At the 2k miles mark, I decided to swap front and rear.

Unfortunately, I got a puncture to the same tyre, now at the front. Fortunately this happened on a quiet bit of road.

Three punctures to the same tyre suggest something is not right. After 2k miles, the tread wear indicators didn't seem to indicate the tyre needed replacing:

but the cause of the repeat punctures was to be traced back to a hole in the centre of the tread:

Whatever caused the hole, was able to penetrate the tyre and vectran belt and puncture through to the inside casing:

I decided to replace the tyre with yet another GP4000S due to its performance, especially in the wet, up to that point.

I must admit though that these tyre are not the most comfortable when run at their recommended pressure.

I am therefore thinking of replacing them with a set of Vittoria Diamante Tech 220TPI when these need replacing.

For future reference, the tyre circumference when new is 2122mm.

That's the number you should tap into your bicycle computer.