I've been using "beads" in my bikes since 2005. Never, ever had a single problem & I like to ride much faster than I should. Had my "B" over 100mph, smooth as silk & I've never had a problem, not one.. 1oz in the front, 2oz in the rear. Always smooth as silk.
If you put too much in, or leave the old weight on, bent rim, bad tire, you might have a problem. 'nuf said.