Phil Wood Aluminum Outboard Bottom BracketPhil Wood manufactures their new 2nd Generation Aluminum Outboard Bottom Bracket (OBB) Cups for integrated spindle and crank systems from US produced 7075 aluminum. To fit Shimano 24mm cranks, or SRAM GXP cranks. Each OBB cup, center sleeve and spacer is machined in house to the same high quality standards they apply to all of their products. These cups are only available in British threading, and in 68 73, 83 and 100mm spacing. All of their OBB cups