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Join Date: Jun 2020
Location: San Francisco, CA
Posts: 200
Bikes: 2018 Jamis Renegade Exploit, 1996 Trek 930, mid-90's Dean El Diente, 2010 Scott Addict SL, 1998 Trek 730, Xtracycle EdgeRunner 30D, Xtracycle Swoop, 1992 Trek 790
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I had a similar issue with a very different rim. The mechanic at the local shop identified that it was a narrow rim which made it difficult to get the tube and tire in place, so I'd been pushing the valve stem up into the tire to make sure the tire bead seated. This allowed the tube to fold over onto itself next to the valve, leading to a flat near the valve stem a few days after inflation. Now I'm careful to use the stem nut to hold the tube to the rim and I've had no flats since. May not be your issue, but worth looking at.