This may happen as you continue to ride your FLEET. If your back wheel feels loose, align your rear wheel and start to tighten the bolts. You want the chain to feel tight but not overly so. Use your wrench to tighten both bolts and making sure the wheel is centered. If you feel that your back wheel is loosening because you have ridden over an obstacle, or hit a pot hole, we highly recommend taking your e-bike to a regular bike shop to have it checked out. We also have a list of trusted retailers that can do assembly and repairs on your e-bike.