Boulder, CO. The Strider Cup® race series gives young children a chance to put their Strider Balance Bike skills to the test. This unique race series caters directly to children 2-6 years old who want to experience the thrill of racing. Children of all sizes and riding abilities are encouraged to participate. In addition to the toddler classes, many Strider Cup races also offer race classes for riders with special needs. Admission is free for families and spectators; however, a race entry fee may apply.