I can't seem the grasp pulling it off. I can do it great on a spool(on its side)/slanted object, it will really launch me in the air. But when it comes to a 90 degree wall theere is no way for me to pull it off. Every time I actually do hit the wall it feels like it is just stopping me from going higher? I get no bounce off it like the spool/slanted wall. Do i need to hit it with more speed? Hit it with the tire lower/higher? Hit it with a more upwards motion?