I am hoping for some advice on how much I should ask for a tandem I would like to sell. It is about 15 years old but looks new. Maroon in color, Suntour components, 21 gears, road/touring bike. It was made by Nashbar and is called the RT1000. I can't find any others on-line. Does anyone have one? Know how to price something like this? Thanks in advance for your ideas.