The front grips on the the frame, and the rear peg just sets in the back. You're right that the rear nub is a bit shorter, but we make it thick enough so there isn't much give or wiggle. Instead of choosing to make that rear peg longer for more weight ( which is really why it's that long in the first place ) we shortened it up and added more material by having it climb up the grip a bit more ( also securing it better ).