I have a giant ocr-1, with an adjustable stem. If there is -any- pressure on the handlebars ie. im riding the bike... the stem makes an awful squeaking sound, very annoying. I read on some other cycling sites that other riders had this too so they purchased an easton stem. I would like to try this, but I found several sizes and need to know how to find out which one to get, if anyone can tell me how to get the correct one, i'll be very grateful!

-J