The Strider Sport 2-in-1 Rocking Bike provides babies (yes, we said babies) everywhere with the opportunity to go from rocking to riding! The detachable base supports your little one as they learn how to balance and lays the foundation for a lifelong love of biking adventures. Witnessing your baby's excitement is priceless as you watch them first explore the rocking bike from the ground and finally take to the rocking motion like they've been doing it all along. When they start begging to get out there on two wheels, transitioning is super smooth with the easily removable Rocking Base. With the Rocking Base attached, this product is intended for ages 6 months - 2 years old. It keeps the bike stationery and lets your rider get a feel for safely sitting upright and developing balance over time. Simply detach the Rocking Base when they're ready to roll into the next step of the Learn-To-Ride process. From baby steps to big strides, the Strider 12 Sport Balance Bike grows with your kiddo up to 4 years old (inseam measurement of 26-46 cm. 10-18 in.). With this innovative 2-in-1 design, your rider has everything to learn to ride. No tricycles or training wheels needed! FEATURES: Includes BOTH the Rocking Base and 12 Sport Balance Bike With a seat height range from 9 - 17 in. (23 - 43cm), the 12" Sport fits children with an inseam of 10 - 18 in. (26 - 46cm) Maximum rider weight with base: 40 lbs (18 kg) Maximum rider weight without base: 60 lbs. (27 kg) The Strider 12" Sport Balance Bike alone is intended for children 1 year - 4 years old. With the Strider Rocking Base attached, intended for ages 6 -24 months Rubber mini grips and handlebar safety pad provides extra protection from bumps and thumps along the way Never flat, no-maintenance, 12" foam rubber tires Easy, no stress assembly with all tools included