Two new bottom bracket standards are rapidly gaining acceptance in the bicycle industry. BB30 and Shimano Press Fit BB90 bottom bracket systems allow bearings to be pressed directly into an oversized bottom bracket shell, eliminating the need for threaded bottom bracket cups. The Park Tool BBT39 Bottom Bracket Bearing Tool Set is designed for installation and removal of the bearings used in these new bottom bracket systems. The BBT39 includes two bushing sets, which are used in conjunction with a
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