NOTE: There are models of press fit bottom brackets with a very narrow inner edge for any tool to catch. This will possibly leave cosmetic scarring inside the adapter. Reverse the remover tool and repeat by driving out remaining bearings. Use a hammer to strike the tool end and drive out the bearing unit. For more on tools required, see Bottom Bracket Tool Selection: Press Fit. Select the correct removal tool based on the inside diameter of the bearing, which nominally in the same as the crank spindle diameters. This will help in identifying the tools required. It is the assumption of the manufacturers that if a pressed bottom bracket is removed, it should be replaced.īegin with crank removal. Striking the tool can cause deformations to the cup and the bearing system, which can negatively affect the performance of the bottom bracket system. Many press fit bottom brackets are designed so a removal tool must be seated against the bearing. To see a review of the various standards, see Bottom Bracket Standards and Terminology. The bottom bracket is then held in by the pressure created by the interference. This creates an interference fit, also known as a press fit. The bore is slightly smaller in diameter than the bottom bracket cups that hold the bearings. The frame shell in a press fit bottom bracket system has no internal threads. BBP-1.2 Bottom Bracket Bearing Press Set.RT-1 Headset and Bottom Bracket Cup Remover.BBT-90.3 Press Fit Bottom Bracket Bearing Tool Set.BBT-30.4 Bottom Bracket Bearing Tool Set.
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