I do hope it all works out well for you in the end. I can accept minor things being overlooked before you take delivery of a bike, but this tells me it wasn't properly checked. Brakes and tyres on a bike are your life, and as such should be a number 1 priority for any dealer to check. Ok, they are being nice to you now, could be because they are worried you will report them for selling an "unfit for road use" vehicle, but I would still be letting us know who they are, for our safety.