I got a set of Powers last month and noticed a "strange line" that goes all the way around both tires. I looked it up on several other forums and it seems like quite a few people have the EXACT same thing going on.i guess its been chalked up to something with the molding of the tire. I haven't found anyone saying it will lead to problems or that a tire with said line had failed, but I thought i would check with OR and see if it was cause for concern. you can see the line left of center on the rear tire and right of center on the front.