I just bought my first bike in about 7 years to commute to work. I've been riding it for a few days now and my "sit bones" are killing me. I remember some pain at the beginning of each summer when I used to Mtn Bike alot, but this seems different. It has been 7 years (and about 50 more lbs) since I've ridden, but I'm wondering if my saddle is too narrow. I'm a big guy 6'1" 280 lbs. I feel like the pain is slightly on the "inside" of my sit bones. By that I mean, if I sit on the edge of a desk, the pressure there doesn't bother the tenderness I've got from riding the bike. Does that sound normal?

Also, this is the bike I got http://www.globebikes.com/us/en/glob...sp?pid=10ROLL1

It has a pvc plastic saddle, which has a great shape and some "give" similar to the leather saddle I had on my XC bike. I love the theft deterrent nature of the saddle, but could the fact that its plastic be part of the problem?