This category is for buy/sell/trade posts. It is for private individuals only. Bike shops or manufacturers should use the Vendors forum.
Once an item is sold (or delisted) modify the title of the post to include SOLD or DELISTED, or FOUND as appropriate.
Note, we do not have a mechanism to delete ads.
To be honest, deleting ads or modifying the post text after someone has commented comes off as sneaky and underhanded. There should be no need to cover your tracks.