Box Pinion 13t Chromoly Shimano-type Cog for BMX Cassette hubs - 3/32" - Black Sz 12 The bends of the uprights

The bends of the uprights and crossbar provide maximum welding surface area for ultimate strength

With Mike Aitken's reputation and influence as a trail-slayer

works with Schrader valve tubes and 29x1

Color: Purple anodized

Box Pinion 13t Chromoly Shimano-type Cog for BMX Cassette hubs - 3/32" - Black Sz 12 The bends of the uprightsThe Box Pinion (Box One) is a CNC machined 3 32" chromoly cog. It is designed to fit Shimano compatible cassette hubs and has a 5mm wide inner base, giving a more solid interface with the cassette body. This style of cog will fit many BMX cassette hubs like the Shimano DX, DXR, Sinz, Bombshell, Redline, Haro, Rhythm and many many others. Size: 13t Color: Black