I don’t mean to disagree for the sake of disagreement, but unless I am terribly wrong (and I am quoted on the Speedplay manufacturers own website for saying this in a review published originally on my store website)- the Zero and X series pedals have the same degree of rotational movement. The zero has the capability to restrict the range of rotation all the way down to zero degrees from the original amount introduced on the “X” series.
I’m afraid you are terribly wrong:
he Speedplay Zero Pedal System introduces a new concept in pedal design that allows you to choose either a fixed position or up to 15 degrees of float. Zero pedals maintain the traditional feel of a fixed system while incorporating all the well-known advantages of Speedplay X Pedal Systems.
http://www.speedplay.com/index.cfm?fuseaction=home.zero
I use the X series pedals because they’re cheaper, they’re lighter (yes, only by a few grams), and I am perfectly fine with the float, since my feet don’t wander all over the place. and if you set the float to zero, what’s the point of getting speedplays? I am perfectly fine with turning my foot 28 degrees to disengage. the dirt-resistance of the zero cleats is not a big issue for me, because I manage not to get my X cleats fouled by walking carefully. had I started off on Zeros, I wouldn’t exactly be complaining.