Originally Posted by
63rickert
Once the fully deflated tire is on the rim, inflate to full pressure. Spin the wheel and true up the tire on that completely smooth and unglued rim in your photo. True the tire by lifting the wobbly section and dropping it. The tire basically wants to be centred in the trough of the rim. This is your chance to learn tire truing. When you do it again with glue it is not so easy. Practice as much as you like.
Some tires are tighter than others. Most of the time they stretch plenty to be workable sitting overnight. Stretching longer than that could help and can't hurt. A few tires can be glued easily immediately. (All tires can be glued immediately if you try hard.)
20psi didn't hurt anything but don't inflate a tire hard when it is not on a rim.
Expect glue to get everywhere and be happy if you do better first time. Let the glue flash ten minutes or so before mounting glued tire on glued rim. 'Flash' means the shiny when wet glue has a
dull look on surface. It is still wet underneath. Half of the tube in the photo will do both tire and rim. Using more does not hurt anything but will increase the mess level.
The next size smaller is a full two inches smaller in diameter.. Yes, inches. This is an American invention. You would never be able to stretch a smaller size onto your rim. Mistakes can't happen.
I will try pulling on the tire harder tomorrow to get it to fit. If it doesn't fit I will have to figure the rim is 27". Don't have anything to measure it with now.
As soon as the tire is stretched I plan to use the method Park Tool suggests. According Park Tool, I will do a layer on the tire strip and then three layers on the rim, waiting 24 hours after the first two layers, and then 1-5 minutes after the third layer on the rim. After the minutes I would push the tire on, starting about 1 ft. from the valve, pushing, using thumb force, then rolling the wheel, then truing the tire, possibly then making sure there is enough glue.