Finally, after 7 bike rides I have finally made it thru today without a flat. Now before everyone offers suggestions, this is with two different bikes, tubular and clincher, and 4 different brands of tires. I was thinking I should get out of the biking hobby. I might be getting even with only 3 flats in my lifetime before this run of bad luck. My wife even suggested that I buy new wheels [and she never wants me to spend any money on my bike/tandem].