New to the forum and doing research into buying my first mountain bike (a hardtail). I've gotten some conflicting advice re: sizing and fit from a few different LBS's that I've stopped into in the last few days. I'm approximately 5'10", and I have a 17.5" frame hybrid. As far as a mountain bike goes, one LBS salesperson told me I need a 17.5" frame, while another said I should get a 15" frame, which will give me some more clearance in the highly likely event that I get bumped around a bit on a trail.
Can anyone enlighten me? Also, I plan to use the bike 50-50 to ride off-road on some singletrack and also for some relatively mellow trips around town on bike paths and streets.