All-City Big Block Bike - 700c Steel Night Sky / Smoke 46cmAll City Big Block Bike 700c Steel Night Sky Smoke 46cm. The Big Block represents All Citys vision of the ideal track bike for everyday life. Take it to the streets or the boards. Wherever you ride it the Big Block will hold up its end of the deal. 612 Select chromoly steel with double butted main triangle tapered stays and brazed on seat collar 4130 Chromoly double butted fork with lugged crown and tapered blades Velodrome legal track geometry All