The KinderBike BMX Sport trainers are as rugged as they are beautiful. They are designed for young learners who aspire to push the envelope. All Sport trainers are engineered with a low center of gravity to prevent accidental tip-overs, are extremely maneuverable and include a polished 6061 aluminum frame and stunning color-anodized alloy components (not plastic). Like all of our top-rated trainers, the KinderBike Sport trainers are also outfitted with a cushy saddle that is both angle and height adjustable for maximum comfort and comes with a carrying handle for ease of transport. Plus, it includes an extender seat post which allows for a whopping 12.5" - 20" saddle adjust range (ensuring years of riding fun), lightweight single-wall aluminum wheels with sure-grip rubber tires to prevent accidental wheel slide-outs. Sport PRO trainers allow your child to excel on any surface.