Bill wrote:
Anyone know the seatpost size for an '88 Trek 330 ?
I thought it was 27.2 but it doesn't seem to fit.


It isn't listed in the seatpost database
http://sheldonbrown.com/seatpost-sizes-m-z.html#t, so you really have
only one good option: measure it. Either measure the existing
seatpost that fits it with a pair of calipers, or measure the inside of
the seat tube with a pair of calipers. Another option is to see if the
the existing seatpost has it's size marked on it - sometimes they do,
sometimes they don't. If you don't have an accurate set of calipers,
find someone who does. Any decent LBS should.


Later,
Mark Muller