You can check out all of the iterations of the Felt85 here: .
2008 Felt F85 - BikePedia It shows all of the years it was made on the right side of the page. You can often get the exact year by comparing the components and frame color. Components such as the crank arms and the hubs may have a manufacturing date stamped in them. If you are lucky you got one of the years Felt used Shimano 105. It's a great mid-level component set that with normal maintenance will last for years. Sora and Tiagara work OK but I much prefer the 105 level. Ebay is your friend when it comes to buying spare parts. I like to keep a set of brake and shift cables handy. They are easy to install and save a lot of time and money over having a bike shop do the installation.