It's clearly an scam. Do you remember the laughs we had with that guy selling a "seat pan"? after that, I decided to make those scammers lose their time. In the spanish ad pages there are lots of scams like that. They always ask to send the money via western union. I started to negotiate the price, and they willingly reduce the price without hesitation, because obviously there is no bike involved!!! I used to give a fake transfer number, and when they came back telling it was wrong, I apologized saying the "8" was a "6" and so on. Some of them stayed for three tries, but one of them really believed I had sent the money and came back for at lest 8 times!!!!
Raul