Currently have a Hoffman Rhythm 18" ---and yes, I am not a tall rider.
I used a lighter seat (and sawed the seatbar)- lightest pegs available and a lightweight front spocket - also changed the standard "gooseneck" clamp to a much lighter version. the bike was like 32 + lbs from the store and is now less than 28. And let me tell you the bike has taken some major punishment and has not fallen apart - this bike was made for a smaller person -- but WAY to heavy to whip around... 4 lbs lighter and I can do some things ...
http://home.ptd.net/~borowmic/images/fortheweb2.wmv << most current video - you'll need windows media
now if it were 26 lbs out of the box.......
i've got a Apollo MX20.3 BMX
i bought red dustcaps for it, and some red stunt pegs it has a rock hard seat and it is a alluminum frame its alright seemings im only a 12 year old kid!