Join Date: Sep 2006
Location: La Crosse, Wisconsin
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This happens fairly frequently. Many times a tire bead will need help seating to the rim consistently all the way around the tire.
After you install the tire, inflate enough such that the bead presses firmly against the rim, but such that the tire is still a bit soft. Look around the bead/rim interface and look for the "witness line" on the tire (a ring in the rubber just outside the bead area). The distance between the edge of the rim and the witness line should be consistent around the tire. If it's a problem combination, you'll need to work the tire out a bit in spots with your hands to expose the witness line.
When the distance between the edge of the rim and the witness line is the same all around, inflate to full pressure and check again. If it looks good, you're good to go. If not, deflate and start over.