I have a Cube Attain GTC (~1600 euro) I bought about 4 years ago. I have had no problem with tyres until I’d say the past 6 months when I started buying Continental 5000 Grand Prix Tyres. Firstly, I thought someone had slashed one of my tyres as there was a long blowout in the side wall of the tyre just above wire. Unbelievably I only noticed it until I went back to the bike after work to cycle home and that’s why I thought it strange. Anyway, Covid came in and I had to fix. I bought another Continental 5000 (from Halfords again) and as I was blowing up tyre it exploded in exactly the same way. Nowhere near 100 PSI. I thought fair enough. That was probably my fault as I tried to put in an anti-puncture strip inside the tyre which has worked really well in the back tyre (back tyre is a Continental Ultra Sport). So I removed the anti-puncture strip and bought another Continental 5000 Grand Prix tyre. I got about 1 mile down the road and the tyre exploded again. Same Issue. I then went and got the last Continental 5000 Grand Prix from Halfords (I know - you think I’d have learned, but everyone tells me they are a great race tyre. Now I have just walked home after only getting 5 miles. There is no metal sticking out of the side wall. There was no sign of a genuine puncture - and I do this journey a lot for work.
I cannot understand it. If it was a puncture like I’ve had in the past why in the hell does the tyre always explode just above the side rim. I put pressure to 100 PSI.
Can anyone help - is this a bad batch or am I doing something wrong?