GroBikes is a subscription service for children's bicycles.
Parents sign up for a 12 month subscription and their child gets a good-quality, lightweight bike that is the right size for them now. During the subscription period, if their child outgrows the bike, GroBikes exchanges it for the next size up at no additional cost. The original bike is cleaned, maintained, and returned to GroBikes' inventory, ready for another family to use.
It's that easy.