Profile 19mm Hop-Up American Bottom Bracket Set - Blue Anodized - USA Made 51mm It is CNC machined from

It is CNC machined from heat-treated 4340 aircraft alloy steel and zinc coated for a smoother

micro knurled sides for improved corner traction

This bottom bracket also comes with a shim to fit 24mm/22mm GXP style cranks

Fully welded joint construction

Profile 19mm Hop-Up American Bottom Bracket Set - Blue Anodized - USA Made 51mm It is CNC machined fromFor frames with American BB shells, this Profile Hop Up Kit offers a finished look while providing cups, sealed bearings, a tube spacer, cone washers, and flat washers. The spacers and cups have an anodized finish. This bottom bracket will fit many popular 19mm cranks such as Profile Race, Redline Flight, Fit, DK Social and most any other 19mm crank. Formerly known as the American Bottom Bracket Kit with Hop Up. Color: Blue Manufacturer's Note: This