Recent 39++ Tires For Bmx. Impac freepac 20 x 2.0 bmx kids bike tyres and schrader tubes (pair). Bmx bike tires made for freestyle disciplines such as flatland and street bmx are designed to be both durable and however, 20 inch bmx tires are the most common size and preferred by most riders. A new set of tires can noticeably change the feel of a bmx, save a great deal of weight, and enhance the.