I sell on
Ebay, it is my livelihood. Believe me, ive seen it all. But Ebay is your friend. It is a buyers platform. Sellers get next to no protection, even against indecisive people who have twitchy fingers who buy on impulse without obtaining all the details. Generally speaking, you can in most instances get a refund for most products for most reasons. I've even had people damage stuff on purpose and claim it arrived that way in order to obtain a refund, a refund which i would have granted anyway (and paid for couriers) had they not, which costs me even more money. I have fought a few cases with the dispute system, but believe me, no seller wants to go through that and every seller ive spoken to in the group im involved with wants that because Ebay will 95% of the time, side with the buyer. They want to preserve the buyers protection in all the marketing spiel with figures to back it up...
There are bad sellers, buyers do need protecting but i struggle to find sympathy in these sorts of cases.
I hope the bicycle is everything you hope it is and you stack up against your friends on Sundays otherwise i sense the seller might be getting his bike back and be out of pocket...