Are you riding with cycling gloves? If not, might want to pick some up. In many cases, stock seats aren't that great--probably the most often part of the bike that gets changed. Some newer bikes are coming with better seats--I can remember when the cheapest seat available came on bikes, guess they fig'd most people would change anyway--some bikes now come with decent seats, some still don't. LOTS of threads on this site regarding seats. if you haven't ridden in a while, it's not unusual to have a sore backside. Have fun with the new bike!!