Blank tyro bmx bikethe tyro is a junior sized 20 bmx it features a low slung 18 5 top tube hi ten frame and low 7 bars that makes it perfect for the smaller rider who wants to still be in the 20 club it features sturdy 36h rims and fat 23 tyres this is an excellent bike for the young rider features frame blank 1020 hi ten frame top tube 18 5 forks blank compound tapered forks handlebars blank compound 75 bars grips blank mushroom style flangeless grips stem 55mm frontload s