Saturday while in between monkeying with the Miata I also fixed the flat on the tandem. Pulled the tube out and pumped it full of air. It came right back out. In a rush. Sounded like from the valve stem. I put it under water in the bathroom sink and air bubbles came cascading out from around the base of the stem. It was not patchable.
Neither I nor the local bike store had the proper sized (26 x 1.25) tube with a presta valve on hand. She said she would order a couple and I figured I would use the tube I had that was close (26 x 1) to get by until they came in.
When we got up this morning to go for a bike ride, sure enough the tire was flat again. Not a big deal, we were going to ride our single bikes anyway, but I’ll take it apart tomorrow to see if I can see something. Maybe there is a sharp edge on the rim where the valve stem passes through.
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