My first post here gang, love the forum. I have a 2 year old Jamis Coda Sport. I had a riser put on my stem for a more upright position (back issues). I was thinking of a new bike (1000.00 or so) with some carbon on it for a faster smoother ride. As I chatted with mechanic about this he suggested new Shimono hubs and new Mavik Open Sport wheels would make a huge difference and save my money as the frame and the rest of the bike was fine. Any thoughts. By the way this bike has barely 100 miles on it as I haven't been able to ride since bought, but now after 2 back surgeries I can finally ride and get back in shape. Thanks.