I have a “new” set of Pirelli PZero Race TLR SL with 1100 miles (1770KM) on them. I’ve noticed that a “seam” has developed on both front and rear tires on both sidewalls of each. The image included here is the only part of either tire that has some “thread” that has pulled away. Both tires are running inner tubes inflated consistently to 85psi in front and 90psi in rear. I’m 184lbs (83kg) if that matters.
Does anyone have an opinion on what this is and if this is normal to happen?
I have been running Pirelli PZero clinchers for about 3 years (or whenever they were introduced). Mine all do the same thing, and it doesn’t seem to cause any problems. FWIW, I run 85psi front/rear on mine. I’m 63kg
Here is another thread (there are many) that discusses:
It’s common with Contis.
The threads come from the edge of a fabric strip that’s stuck on to protect the tyre casing from the rim hook.
Conti stick the strip on last, so it’s on top and the edge is exposed; other brands put it on earlier so there’s a rubber layer on top that stops the edge losing threads.
Thanks @bclarkson and everyone else - read that thread and appear to be the exact same issue. I’ll post back when I hear from the dealer (who was checking with their Pirelli Rep) and/or direct email back from Pirelli. Perhaps these answers can help others looking in the future as well.
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