lol ^^^ good eye sir! The Deep Spec option is something we will officially offer and list on our site before end of year but in the meantime i'll explain : ) The difference between Deep Spec and Track Spec is the leg extension seen on the Deep Spec, just like the deep concave leg extension option only with a step lip.
For 2013 The Deep Spec configuration will be the improved and updated version of our deep concave line. Reason being, the step lip rim halves are much better in terms of ride quality, weight, strength, and water retention issues which cause vibration in the rain are non existent with these. Depth, styles, applications, etc are unchanged with Deep Spec as opposed to Deep concave or Track Spec's, the only difference is it's a deeeeeeep step lip on many applications when applicable. examples of CDP below: