Amazon.com: smarTrike Toddler Tricycle Stroller, Compact Bike Stroller for Kids, Easy Push Tricycle Kids Stroller Double as a Toddler Bike, Baby Tricycle for 1,2,3 years old Adjusts and Folds(STR5, Black & White) :
The SmarTfold 500 7-in-1 Trike Takes Your Baby From Stroller to Tricycle - Mommy Kat and Kids
Smartrike 8.5-in Unisex Tricycle in the Bikes department at Lowes.com