Smiles for Miles Small in size but big on smiles, the NBD is an easy-to-ride e-bike with an extremely low step-through, making it comfortable and inviting - just as your dream bike should be. Whether you are an experienced rider or just considering your first e-bike, and whether you're running quick errands or embarking on a new adventure with your child, the NBD will put a smile on your face. User Manual Tip: If you want to mount a child seat, attach the ABUS U-lock to the fork, otherwise the lock will no longer be usable.