American BB Converter cups these cups allow you to use any sealed Mid BB 19 in any American bottom bracket frame. If you have a frame with an American BB shell, it can be difficult upgrading your crankset or even finding a replacement BB kit. These American cups should help solve your issue. Sold in pairs 1 Left 1 Right

Specifications 

• Shell: 68mm
• Spindle Type: 19mm
• Cup Type: Press Fit 51mm
• Interface: American
• Bearings: Sealed 41mm
• Material: Alloy
• Color: Black Anodized
• Converts American style 68mm B.B to Fit 3-piece 19mm spindle crank
• Brand: Uno