
(Stem Riser)

(Ajustable Stem)
Cross bikes have very short head tubes. I have a 64 cm frame (seat tube) on my Cross, but it only has a 165mm head tube.

That's pretty short for a frame that size.
I like the Ritchie Adjustable Stem. It is the most secure design IMO, but I should warn you, it is NOT as quickly adjusted as most other designs. If you decide on getting the Ritchie, post again or PM me and I can run you through how to do it. It's pretty simple actually, aside from having to take it off to adjust it. The trade off is a rock solid design though.