I am having a very hard time mounting a Vredestein tire onto my wheel, the first one went on easy, with no problems. I have changed tires before with no problems, but with this one it seems impossible to mount the final part of the tire to the wheel without using tire wrenches. The problem is I keep popping the tube with the wrenches. I was told never to use tools to mount a tire because of this, but what do you do when the tire is just too tight to get on with just your hands? I made sure it is the right size. Is there any trick to getting on especially difficult tires? Any help/advice would be appreciated, I can't tell you how frustrating it is to finally muscle it on and then hear the unmistakable hiss of air escaping. Thanks.