I suppose when you put them in they just reduce the amount of travel by blocking off the travel that is taken up by the spacer? So the only thing you are really doing is stopping the fork diving so much changing the geometry too much?

For it to work on air forks you need to be using your full travel and spacers do not affect the height of the forks.

I was just thinking as I have a pair of Marzocci 55s on my Alpine that are a bit too tall but putting in spacers will not change this at all me is thinking.

the spacers stop the fork extending as much. so its shorter when no weight is on it.

Any diagrams to show how it works/ Where they go. Do they go in the fork stanchions then?

I get the idea. only the spacers I got with my new forks are solid so do not look like they would work in the same way (Revelations).

Ok it was a stupid question conceptually I had it the wrong way around.

http://www.bikeradar.com/gear/article/workshop-how-to-adjust-travel-on-a-rockshox-trail-fork–26840/

Anybody know where I can get spacer for Marzocchi 55 forks? But maybe I already have one http://singletrackworld.com/forum/topic/marzocchi-55r-forks-travel-change