Rear axle loose bearing? Wheel out of true. Frame broke (That one would would be easier to see) Rose Petal or pedals? Sorry to be a ___. Rear tire,, installed wrong? Ride around the blocks a few times, Bikes are very simple. If you mean the crank arms wobble when spinning them by hand? Usually Bottom Bracket trouble. There are loose bearings and caged bearing,, inside the BB Shell. In the 1990's The Cartridge Bottom Bracket Spindle came along. It comes in a box, by spindle width, etc. That spins on to the BB Shell threads, Sorry I can't understand your question, try a local co-op. PS Check to see that both brakes are centered,, ie not dragging.