I have a 2006 Giant Cypress SX (hybrid). It has a suspension fork. I've read suggestions to others to lock down their suspension fork, if possible, as one way to gain a little speed. I tried doing that by turning the little dial on top of the fork, but nothing changes. The users manual doesn't even mention the suspension.
How can I determine whether my fork can be locked down? And if it can be, how do I do that?