Dk sprinter junior bmx bikedks sprinter junior bmx bike is for the younger rider who wants to get serious about racing the 6061 alloy frame delivers a stiff and responsive ride that will help you unleash the sprinter within that being said this bike is equally at home when the gradient goes up the arisun xlr8 tyres ensure that no matter what you put this bike through youll do it on a lightweight low profile tyre that only knows how to roll fast you dont have to be in race mode all the