On my racer, there is a wire under the
top tube. On this wire hangs three very small
plastic washers. Unless someone forgot to
remove them, the only thing I can think of is
they are there to prevent the wire from
rattling against the tube. Not that that would
happen very often for a stiff wire, right?

--
underground experts united
http://user.it.uu.se/~embe8573