I purchased the Overdrive carbon 29er from an individual who had sized himself wrong. It was never ridden when I got it. I loved it for the first 56 miles and then the chainstay cracked. The bike was never down. It was totally flawless… and cracked. I contacted Diamonback and explained the situation. I also sent pictures. They chose to do nothing because I was technically not the original owner. I guess they can do that. Big loss for me though. Not sure if I will part it out or try and slap on a carbon patch.