Magule- good day. 1st,try to force the rim a little bit into the tire,atleast u must get the lip of the rim to seat radiusly.make sure this done at the inner side of rim. then place it over a steady flat surface,with the outside of rim(locknut/spoke side
)facing down to the surface & the tire are above,then place a piece of wood/kitchen cutting board or sort of,over the assembly,now you should give it a good smack over it all. at least 2-3 attemp will make it done n ez..
when you mount these,pop them in boiling water, and make sure it is boiling( hot is no good) 20 seconds, then pull out with a fork and then place the tyre on a hard flat surface. Then with your palm, push the rim into the tyre. It go in fairly easily and pop onto the rim. If it does not mount correctly pop it off and go again. If its too tight, warm it back up in the boiling water again
1. Put the tyres into boiling water in a sink. 2. Now while the tyres sit, get some dishwashing liquid and coat the rims where the tyres go on. Not too thick or thin, just get a coating. 3. Place the rims on a bench outside down, so when you look at the top down, you see the hex. 4. Get a tyre out of the boiling water and press it over the rim until it "clicks" flat to the bench top. You now have a tyre that is flush to the outer face. Repeat steps 2-4 until done and after each one, fine adjust the rim /tyre if you want some outer tyre overhang.
After all done, rinse the whole tyre/rim under cold water to wash away excess washing liquid and let sit/dry for a few hours or overnight. The dishwashing liquid will dry/evaporate. Now run a bead of CA glue around the rim/tyre junction on the inner face. I personally do both sides. Let cure. Done.