I am interested in your bike. It does seem to be priced quite high. Is there room for negotiation?
yes, there is some wiggle room. 
Great. Is there anything wrong with the bike?
Nope, I have put some work into it, so it is in great condition.
Great! Would you be willing to take $100?
No, that is too low. How about $225?
How about $125
I can't do that. How about $175?
If I pick it up today with cash would you do $140?
I suppose we could make that work.