Phil Wood Outboard Bottom Bracket-Stainless SteelPhil Wood bottom brackets are absolutely legendary. Like all Phil Wood bottom brackets, the main purpose of this bottom bracket is to be able to take the day in and day out wear and tear of both serious riders and quality product enthusiasts. Outboard Bottom Bracket (OBB) Cups are manufactured for integrated spindle and crank systems, and are engineered with stainless steel cups for durability and longevity and with Phil Wood Premium Bearings for