Yuba Kids Leg Up Sometimes the kidlets need a leg up, and that's what this aptly named accessory does. Designed to help 4-7 year olds climb up onto the seat and rest their feet until their legs are long enough to reach the Sideloader bars. Silver Includes hardware Easy to install with an Allen wrench size 5. Compatible with Mundo V4 and V5s, V4s frame sets and elMundo BionX. Yuba 2-Year Warranty