You need to get the size down to the length and the girth being no more than 300cm, tricky if its a complete bike, but doable. I just boxed a bike which comes out bang on the limit. It will allow upto 30kg. The formula will do your head in trying to create a box though
You need to use Pharos Parcel. I got a complete Humu cruiser shipped from the UK to Denmark for less than £30. They pick up and UPS delivers on the other end.