The Qu-Ax Cross has a square taper hub. You should probably buy the Qu-Ax trials, which has a splined hub and crank set. There have been a bunch of threads about why one is better than the other; do some searches.
-- fcwegnm0b - HammerTron
"You build a wood contraception that slides over it and has a removable pin at the top to keep it in place" - carsonpalooza
"o yeah how do i change that thing under my name that says i dont know how to change this?" - habbywall