Originally Posted by
Andrew R Stewart
the valve base can prevent the bead from fully overlapping with the rim
the rim and/or tire might be made "off spec" and are not of matching diameters
Originally Posted by
enargins
Looking at the tube, it was torn open by about a foot on each side of the valve.
I do have one 26" tire that I think has stretched or something, and is very difficult to get properly seated. It does happen.
However, I think the
VALVE may be key here. The tire was probably partly sitting on top of the valve.
There are two theories of mounting the tube.
- Start at the valve and work away from the valve.
- Start opposite the valve and work towards the valve.
I prefer to start at the valve. Get the tire partly on, push on the valve some to make sure it is above the tire, and then work around.
Others believe it is safer to do the valve last, less chance of pinching that last few inches of tube. Nonetheless, once you reach the valve, the procedure is similar. Push the valve down to make sure it gets past the tire. Then pull it up.
If the valve is crooked, also make sure it is straight (often by twisting the tire around slightly).
Then inflate.