First Components Bottom Bracket One-Piece Kit

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First Components Bottom Bracket One-Piece Conversion Kit. Includes spindle, bearing rings, bottom bracket cups, nuts, and lockrings. Conversion Fitment: Square Tapered Brand: First Components Size: 51.5x128mm Uses: Perfect for single speed or fixed gear conversions using vintage road bikes with one-piece cranks. Converts existing bottom bracket to square tapered fitment. Show more