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BMX and mountain bike
the new trapezoid chromoly shape helps prevent flex while still offering a grindable surface
KEY FEATURES
Size: Size 13 / Men's XXX-Large (XXXL)
Theory American to Mid Bottom Bracket Cup Set - Aluminum - Gold 1.90 BMX and mountain bikeThe Theory Bottom Bracket Cups allow you to use a mid size sealed bearing bottom bracket in an American size frame. They are made out of anodized 7000 series aluminum. These are made to fit 50. 8mm frames and 41. 2mm OD bearings. Color: Gold anodized Note: This part was colored by anodizing, which is a method of coloring metal. Color differences do occur among manufacturers and even among batches from the same manufacturer. This is not a flaw or