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3,411 Posts
I was working on j-zaps this entire summer. Now I seem to have finally got the trick to them... ie go fast don't touch the brakes and smack into the wall as you are pedalling...
http://web.ics.purdue.edu/~rchertov/upping.wmv
http://web.ics.purdue.edu/~rchertov/upping.wmv