NASA Race Tires - PromoNASA folding bead tires are superfast rolling with pared down and consistent micro blocks that boast lateral traction and effortless rolling speed specifically developed for BMX A rounded profile and healthy dosing of working edges provide predictability for perfect cornering on any hard packed to loose gravel corners. Folding bead 60 TPI 120 PSI hand made to max accuracy Conditions: Hardpack Loose over hardpack Dirt