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whats wrong with putting an ad on gumtree? i understand poating the ad on here but what i do elsewhere is my business?

Not according to the forum rules:

If you have an item for sale anywhere other than here, like ebay, bikeradar, ctc, retrobike, etc. then you cannot post it here.

The point of this rule is that this forum is for a community and isn't meant to be 'just' another sales site. If all you want to do is sell something, go to eBay or Gumtree or something like that. If you want to sell to the community on here, post an ad up on here.

Your choice--you are, of course, perfectly welcome to sell via Gumtree, but then the forum would require you to withdraw the ad here. Alternatively, you can delete the Gumtree ad and sell here and become part of, and enjoy the community here. (And I dislike the over-use of the word 'community' myself, but its meaning is that there are lots of good people on here whom you can meet in real life, go for rides with, go drinking with, etc.--and, of course exchange/swap/sell bikes/bike parts with, so it's certainly recommended over fairly anonymous exchanges for only money on Gumtree.)