Radio Race Cobalt Expert BMX Race BikeThe Cobalt line combines proven geometry and dialled components giving you the best start out of the gate during the first days racing. The Cobalt Expert steps up to a 19. 5" top tube, a longer 50mm reach cobalt stem, a slim radio pivotal seat and wider 1 3 8 Arisun XLR8 tyres. All Cobalt bikes feature fully sealed front hubs and integrated headsets, making them simply unstoppale when comparing price to spec. ###section### Product Specs FRAME