Ollies.
WAIT... Let me elaborate.
I can do ollies, it's just.... See, I learned how to ollie riding super duper tight trucks back in the day. I had them down pretty good. I remember even ollieing over a cone one time that was just a little bit under waist high (which was the highest thing I have ever ollied even to this day).
But eventually, as I kept skating through the years, my trucks got looser and looser, and as they got looser I had to kinda relearn almost all of my tricks on looser trucks, just because it was so different from riding super tight. I pretty much have all of my tricks down now on looser trucks and im pretty much too used to doing all of my tricks on looser trucks now, but one trick that continues to suffer from my change in riding looser is ollies. I can still do them, but they're so low and dragged out feeling now, as opposed to before when I used to be able to float them. The highest I can ollie right now would be about knee high, and even then I have to work for them to get them that high. If its anything over knee high I start having trouble making it over the obstacle. I can do some pretty damn high kickflips and front shoves, but for some reason I cannot pop high ollies. When I step on my friends board who has super tight trucks I can still do some super high ones, but when im back on my board they suffer again.