TL;DR: newb at the track asks a question related with tyre wear and rubber accumulation.
I've went to my first track day (half-day) and it was awesome. Everything went well, I did the worst lap time, bla bla bla I don't care
didn't crash, had fun, learned a few things and it's good.
Right now there is something bothering me... my tyres, BT016, those which came with the bike.
After 2 or 3, 20 minute sessions.
Since I'm a newb and I want to learn... is that accumulation/strip of rubber, from my tyre? Or bits that were grabbed during the day?
If that's mine what could be the cause?
My suspension settings are stock (probably completely wrong but hey! First track day :P give me a break), the tyre pressure was reduced by the tyre guys at the track so...
What do you pros read from this picture?
Thanks for your time on helping a noob rider!
P.S: sorry for errors. (non english speaker).