I think you need a new LBS. Also some have said ( and I agree) put the wider of the 2 tires on the back. I bet most of the posters on here have wrecked their bikes turning on sand, rocks, debris. I had a blow out on my rear going 30 miles an hour on a downhill corner. Slipped for miles on bare metal and finally did an endo into a field and summersaulted with my bike still attached to my feet. I'm a very brave soul and used to mnt bike and rode dirt bikes for ever and it still took me all summer to totally get over that experience. You'll be allright, just ride !!!
