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The other half of the job.
Tapping the threads of a threaded bottom bracket shell is critical for proper installation, but equally important is facing the outer edge of the shell. Trying to thread in a BB cup with sloppy or uneven edges can damage your threads, your crank spindle, or worse. Don't eyeball it — get the Unior Bottom Bracket Shell Facing Tool, compatible with both BSA/English- and Italian-threaded BBs.
- Item #UNR000I
[ITAL] 36 x 24 tpi, [BSA] 1-3/8 x 24 tpi
facing the bottom bracket shell