I have had three flats on my same back tire in a month--The 2nd flat the LBS changed the inner wheel
lining--not sure of the terminology there--then I rode 12 miles came home and 6 hours later my tire went flat--a piece of glass has never been found nor any damage to the tire--I keep my tires properly inflated--
I am riding a specialized sirrus on the road w/ stock tires that have 550 miles--
Should I consider an upgrade to an Armidillo tire on the back? Any other ideas?-The LBS is a mile away and is a Specialized dealer.