- Adapter that enables you to make your steering tube longer whilst retaining the same stem system.
- BHP 20 is for 1" forks. BHP 21 is for 1 1/8" forks.
- Threaded and threadless headset compatible.
- Sandblasted black BBB RoundHead top cap included.
- Size: 25.4mm upper diameter (new stem mounting part) - 22.2mm lower diameter (bolts inside existing steerer)
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