what he saidAre you talking magnets or electromagnets? Big difference.
to use magnetic suspension on a bike it would have to be an electromagnet, otherwise it would just be way too large
even at that, the strongest electromagnet ive seen that could be reasonably fitted into a rear shock or as suspension (in terms of size) weighed about 2lbs and could hold a 100kg weight.
youd need two of them to repel each other etc, so 4lbs before damping and mounting hardware is even considered.
it was powered by a 9v battery pack