Blank ammo bmx bikethe ammo is blanks first full size 20 bmx in the range it is great value for money with fully sealed rear hub 3pc crmo cranks and fat 23 tyres it features a 20 5 top tube and is perfect for the younger or smaller rider it has everything you need to get you started features frame blank 1020 hi ten w20 5 top tube forks blank compound tapered forks handlebars blank compound 8 bars grips blank mushroom style flangeless stem blank compound 55mm top load stem headse