It may also be possible to use it with balance bikes as long as they are designed like real pedal bikes. (babycarrierreviewguide.com)
I can just see ET now with Elliot pedaling his bike across the sky and the moon in the background... Wouldn't that be a fun thing to watch on a summer evening? (theinspiredroom.net)
The researchers learned that the ill twin of the pair couldn't pedal the bike as long as the other. (discovermagazine.com)