I hit forty this year. I mountain biked back in the mid to late 90's. I sold my bike (big mistake) after getting married. Now I want to give fixed or SS a go. Mostly for exercise with my kids, and commuting to work. So far I'm thinking of going with a Kilo and slowly upgrade. I'm very new to this all. It's fun learning the lingo and trying to figure out how to part together a bike. Thanks for being generous with you experiences.