I've been going nuts trying to mount my New Nokian Gazz onto my Mavic Crossmax XL UST rims so I can use Stan's. No matter what tricks I use from the Stan's video can I get the darn tire to just pop onto the rim. It keeps leaking from where the valve stem from the rim strip is and air keeps blowing out of there between the tire.... I've tried a hand pump, a air compressor with low and high pressure and no matter what I can't get the tire to pop on. Any advice?