+ on grinding off the safety bead. 40cm seems like too much, that's almost 16". Would recommend more like 8" or 18cm. Once done you can pop it off by hand. You must use lube to get it back on. Oil is not a good idea for long term, only emergencies. If you carry soap and mix it with a little water it will lube it enough to pop with only 20psi. Soap won't effect the rubber.
"Dad, can I get a motorcycle when I grow up?"
"Son, you can't do both"