The point is not what you have derived from prior art which is already known to be a good thing, but what novel feature you have added which solves some problem with the existing state of the art designs.
If you don't understand this, you are wasting your time and money with the patent application.
You could have used that pointless (indeed moronic) response by substituting any of the following in place of "circular wheels"
1: handlebars
2: chain drive
3: tubular frame elements
4: pneumatic tyres
etc.
The point is not what you have derived from prior art which is already known to be a good thing, but what novel feature you have added which solves some problem with the existing state of the art designs.
If you don't understand this, you are wasting your time and money with the patent application.