Originally Posted by
Bruce Burbank
Thanks for all the advice. I'll try to track down some Schwalbes. Although I need a 700x20 for my rear wheel, and their website doesn't list that size.
There's your problem. 20mm tires need to be inflated to very high pressure resulting in a small contact patch with more weight per square inch against the ground. Get wider tires and lower your air pressure. Not only will you reduce flats, but you'll have a much more comfortable ride.
If your bike can't take a wider tire, then you're stuck.