Bicycle Bottom Bracket Conversion Kit American To European BB Adapter 68-73mm 1.37x24mm Aluminum Black Includes 3 Steel Bolts Fits 55mm Cup Bottom Frames Solid Diy Friendly Install

American to European BB Adapter Kit for 68-73mm Frames
✔️ Aluminum alloy, fits 68-73mm cups, 1.37x24mm, 3 bolts included

The bottom bracket conversion kit lets you swap from American to European standards on bicycles with 68-73mm cup frames. It’s a handy upgrade for older bikes, enabling use of sealed bearings when upgrading components.

✅ Converts American BB to European BB for 68-73mm cups (68-73 mm / 2.68-2.87 in)
✅ Aluminum alloy construction with black finish
✅ Thread size 1.37x24 mm (1.37 in diameter / 24 TPI)
✅ Includes 3 steel bolts for secure install
✅ Fits 55 mm cup bottom frames (inside diameter 55 mm / 2.17 in)
✅ DIY friendly install

💡 What is a bottom bracket adapter kit used for?

A handy explanation helps you decide if this kit fits your bike.

• Expands compatibility across older frames
• Allows swapping from American to European BB standards
• Simplifies upgrades to sealed bearings when cups match