I really need your suggestions. The situation is bellow: I have bought brand new one "Specialized Rockhopper Sport 29" 2017 satin navy-hyper" in a official dealer of Specialized.
When i arrived at home, just for interest rotated bicycle and checked the spinning... during the spinning i noticed that pedal and cassette was shaking - confused, went back to shop and asked them for change but they told me that this is totally normal and there is no bicycle without this.
Maybe it is a hub problem and thats why it shakes.
Still wondering, need your advice, should i take care about it or it is normal?
Here is the video:
Please consider the fact, even when i touch to cassette it is obvious that it shaking really.
Thanks a lot. Look forward to hearing from you people.