Based on your edit, do this. Remove the wheel, deflate to about 10 PSI, then roll it along the ground, pressing down hard, for several revolutions.
After you've done this examine the strip. Anywhere where the strip is not showing the "average" amount, tug on the tire to pull it out. Anywhere where the strip is showing too much, first examine the opposite side of the tire at that (ie, the left side of the tire if the problem's on the right). If the strip is not showing as much on that side, tug it out a bit. If the strip is showing too much on both sides try to work it inward (tug out other places where it's too close).
You may find that the tire sits too high near the valve. This is often due to the thick portion of the tube near the valve being caught between the bead and the rim. In that case, push the valve into the tire (remove the nut if there is one) and try to rock the tire back and forth to get the tube in the right place.
You may find a spot where the tire sits too low. This can be due to having twisted the tube while installing it.
Once you've got the tire relatively well centered, inflate in increments of 20 pounds or so, roll along the ground, and inspect/align again, until you reach your desired pressure.
And, of course, if you have a blowout on a tire, always examine it for actual holes that will let the tube "balloon" through. Small ones can be fixed, at least temporarily, with a "boot". Bigger ones (larger than about 1/4") would require the tire to be immediately replaced.
And, since you don't say what size this is, remember that not all 26" tires have the same rim diameter. Make sure that the metric diameter on your tire matches the metric diameter of the rim.
Also, when installing a tube the way to do it is to first inflate the tube just enough so that it rounds out and limply holds its shape. Then work the valve into the valve hole and tuck the tube into place. This is easier than inserting while completely flat, and it helps assure that the tube is not twisted or caught between tire and rim.