Personalized National Bike Month Biking Cyclist Youth Long Sleeve T-Shirt. Biking design has person riding a bicycle with quote that says May is National Bike Month on this Youth Long Sleeve T-Shirt - White with distressed style logo. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)