Smiles for Miles Small in size but big in smiles, the NBD is an easy-to-ride e-bike with an extremely low step-through that is both comfortable and inviting – just like your ideal bike should be. Whether you are an experienced rider or just considering your first e-bike, and whether you're quickly running errands or setting out on a new adventure with your child, the NBD is sure to bring a smile to your face. User Manual Tip: If you want to install a child seat, attach the ABUS U-lock to the fork; otherwise, the lock cannot be operated.