Bicycle Bottom Bracket Aluminum Alloy One Piece Bike Bottom Bracket Metal Bottom Bracket for Bike Modification

Features:
Made of high intensity aluminum alloy, solid and durable in use.
Easy to install, R stands for right side, L stands for left side.
Fine workmanship and clear thread, different parts connects closely.
Accurate bearing, assure that the center of the circle is consistent when turning.
Compact size and lightweight, easy to carry and store, convenient to use.
Suitable for the thread of 1.37'' with an inner diameter of 24mm(0.9in).