I haven't had any structural issues with mine. I did have a small aesthetic issue with the paint, but got over that; it's hardly noticeable to anyone but me. It looks like they just missed a spot. I wondered if it was structural and took it to the dealer. He laughed at me

, but it was brand new and I was concerned. It's been a great bike. They have lifetime warranties, but I think you have to go through the dealer for it to qualify. You said second hand, so do you know how it was ridden before? Racer, club rider, etc?