I need to know how much vert should i use on a 8 feet radius half pipe.

Have you ever ridden a vert ramp before? If not, I would recommend not putting any vert on it, unless you build an extension.

what do u mean by extension

A section that is higher than the rest of the ramp.

EEE---------EEE

Like that. If the dotted line represents something that is 6 feet high, then the extension (E) would be, say, 7 feet high.

this guy i gonna be tired riding that ramp---need speed to get out ya know.

goto www.bmxtrix.com. they've got ramp plans for vert as well as minis. might help.

I would put at most about 2-6 inches of vert on any bike ramp. Bikers don't need a lot of vert. Mostly you want the ramp to be smooth.

i like really fast stuff to. i have a great local abandoned pool.