received a bike where the sprocket was not tight at all, had to give about 10 spins on each side, after two days of ride, the sprocket creates some weird noise when foot pressure is applied, the disk has a visible line where it was put together, its just a piece of metal that was bent into a circle, i was also expecting the assembly at my local bike shop to be free, where it came to be 25$, which makes me wonder why i bought the bike online when i could have bought the same bike in the local bike shoo having one year warranty