Thread: What is this?
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Old 03-08-20 | 11:24 AM
  #1  
Miradaman
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Joined: Nov 2019
Posts: 274
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From: Greater Chicago Area

Bikes: 1989 Trek 420, 1995 GT Timberline, 1979 Schwinn Super Le Tour, Co-Op DRT 1.3

What is this?
Got my old Trek road bike on the stand for a cleaning and to replace cables. Took a good look at this fitting on the back of the head tube while it was up and still can't figure out what it is/does. Anyone? Just curious. Thanks

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