Does anyone know how many engagement points are in the Atomlab Aircorp rear hub? I am running a 26" Mavic 521/Shimano XT wheelset and was thinking about picking up a 24" Atomic Trailpimp wheelset. I'm interested in using it mostly for urban riding, but want more engagement points for trials style moves. Also, does anyone have a guess at the weight comparison with my current wheelset (lighter would be nice too)? And how would 24" work for that kind of riding?