Bam: 50/50 Grind is when both trucks are on the rail. Kind of like this, because 50 percent is on this truck and the other 50 is on that truck.
Kerry: You want to ollie up on to it and land both trucks. You are riding on both trucks and that is pretty much called the 50/50 Grind. You want to learn on like a low curb or something first. Grind both trucks 50/50 Grind on something low and then you can step it up as you feel more comfortable on that to a ramp. A 50/50 Grind is the first grind you want to learn. It's not nice, you just need to learn a 50/50 Grind. So a 50/50 Grind is pretty much your key before a Nose Grind or a Five-O. Learn that before anything else.