I have a GT Tempest mountain bike with Shimano components. I bought it about 9 years ago and only have probably 30 miles on it. Is it worth keeping or should I sell it and buy new? It doesn't have all the socks and cool peices that the new bikes have but it is very solid and in perfect like new condition. I am really starting to ride now and want to start off right. What are your thoughts? Thanks all!