I replaced my rear tyre with another Pirelli Rosso Corsa last Wednesday and I've been riding normally, nothing to extravagant and have been scrubbing the tyre in over a few days. Today I went to Brands and did two sessions on the GP circuit. The tyre has been fine on the road with no wear and tear showing on the surface. I hadn't changed the suspension settings, I was running 31psi on the rear like I always do and I wasn't riding as hard as I have in the past and this happened This was after the first 20min session which included a fastish few warm up laps and this was the state of the tyre after the second session I'm taking the bike back to the shop tmrw to see what they recon, but I'm really shocked/worried about the peeling of the layers of the tyre, especially at what appears to be the two different compounds splitting away from each other on the right side. What do you think? Faulty tyre?
That definitely doesn't look right.... I'm amazed you went out for the second session......let us know how you get on with getting it replaced
Totally weird. Never seen anything like it. Take it back as see what the supplier says.... but do it slowly.
I had some Dunlop 208s that did that to me. The original rear and the replacement that was supplied to me FOC. A second rear replacement came direct from Dunlop and was fine. It seems some batches just don't get manufactured correctly.
Looks like the rubber layers haven't consolidated properly during manufacture, it's a dual compound tyre so the main "cut" is where the 2 compunds are different. Bit of a worry that such a fault has made it beyond the factory. Might be worth dropping Pirrelli a line directly. Contact Us - PIRELLI UK
Tyres run hotter when you run lower pressures. The carcass moves more and generates more friction between the rubber molecules which is what generates the heat, over inflate and the tyre slides causing heat only on the outer surface. 2-3 psi is going to make bugger all difference anyway on a road tyre. I would say the tyre hasn't been cured properly during manufacture, so when subjected to moderate temperature the individual pieces of rubber that make up the tyre have started to com appart.
Apparently that happens when not enough heat is used in the manufacturing process so the compound layers don't bond properly and they "peel" They're faulty, not particularly dangerous and should be replaced free of charge.
Never seen that before. Is there a country of manufacture on the side. Heard horror stories of french made dunlops being not as good as uk ones and chinese stuff being even worse. Saying that though, even the GP guys get a duff tyre from time to time and you've got to think they the best of everything. I hope you've just been unlucky and get a free replacement. Being on the harder part the tyre means it may be cold tear as you thought, but still, never seen it like that before.
Have you checked the swingarm or hugger for witness marks? A long shot but has the tyre been rubbing on something as you get upto speed and the tyre flexes? I hade similar on my R1 after fitting a 190/55 rear and the tyre rubbed on a small weld on the middle of the swingarm, it made a pretty deep groove in the tyre!.
