Has anyone noticed any issues with the flex of this frame? I can bend the chainstays without much effort, causing the pads to touch the disc. Overall, the frame seems pretty flexible, probably the most flexible I've ever owned. I hope it doesn't affect the speed too much. This is probably not surprising given the weight and price of this frame. Perhaps it would have been better to order the new lightweight Long Teng frame; it has more massive chainstays and greater clearance for wider tires.