We set out to design a trainer suitable for the youngest of riders: Mission accomplished! The E Series Air affords the light weight of our E Series line but with the preferred highly-durable alloy pneumatic wheels found our high-end Laufrad and Mini trainers. Engineered with an extremely low center of gravity to prevent accidental tip-overs, the E Series Air offers the lowest saddle height available (11"). Plus, even with alloy-pneumatic wheels, it weights a paltry 7 lbs - making it the lightest trainer in its class. In fact, it is the only trainer with alloy-pneumatic wheels to weight less than 8 lbs! The E Series Air trainer also comes with quick-release collars on both the handlebar and saddle - allowing parents to quickly and easily customize the size to their toddler.