cyclezealot

This is like my second or third time I've had a flat adjacent to the valve stem . Upon removal I've discovered the tube folded over multiple times at the stem. Being that the tube and tire are 700 mm, how can ther4 be that much excess length.
. I insert the tube very carefully, the best one can see the tube is not crumpled upon insertion. To assure its not crumpled upon insertion , I partially inflate the tube prior to mounting the tire about the rim. . Deflate and insert the deflated tire on the rim. Several hundred miles later I have a flat, with the leak in the crumpled segment adjacent the valve stem. Anyone else have this problem. This seems so unnecessary and getting old. What am I doing wrong. Thanks.