Strider 12 Sport Balance Bike One of the most popular options is the Strider 12 Sport Balance Bike ($110, originally $120), because it's able to adjust to accommodate kids from 18 months to 5 years old. These bikes are durable, with puncture-proof tires, while staying lightweight. Image Source: amazon.com Strider 12 Sport Balance Bike $110 from amazon.com Buy Now