Ok, so I'm not a new rider, but I feel like a newb asking it.
I have noticed for awhile now that there's a consistent thin line down the centre of my tire along the entire circumference. It's not straight and kind of curves around a bit. It is not on my front tire, and never goes away. I've checked the bike and there's nothing that could rub against it while I'm riding that could cause that line.
I'm running michelin PPs and running proper psi too. Anyone else get this?