bikerumor pic of the day monday mystery pic

We are reviving our Mystery Pic series! If you have any idea what this part is, please let us know in the comments section. This photo was submitted to us by Andy Wiedrich, Warranty Manager at University Bicycles in Boulder, Colorado, “We came across this guy, and have no idea what its for. FYI, A Ritchey Break Away Der hanger fits on this guy pretty darn close.”

To send in your own Mystery Pic to be considered for the Monday feature, click here and attach your photo with all pertinent information.


  1. Looks very much like the drive side drop out off of a 2010-2011 ish Tranisition Double. Transition sold some of the drop out as “bottle openers” for a $1 on their website a while ago.

  2. It’s clearly a late-90s Campagnolo bar-end derailleur hanger, from an ill-fated attempt to make the world’s first gravel racing bike.

  3. It’s a drop out, drive side, but seem to be an insert for a Carbon frame… to be molded in the chainstay and clamped with a bolt on the seatstay.

  4. looks like a generic drive side dropout from the TBG book (Taiwan Bike Guide). Can be ordered and used by frame makers who don’t have the resources to develop their own forged parts.

    no it’s not Specialized…look at that pivot location.

  5. campy suspension seatpost linkage. from their 1917 super roubaix line. maurice garin used these later in his career for all the cobbled classics.

  6. @ J,

    Yup. John nailed it. To get them to work better as a bottle opener, you have a to grind in a lip to make them work well.

  7. The trick here is there is no sense of scale. This is a rare prototype Campy saddle. You can clearly see on the left side of the pic how it mounts to a vintage campy seat post.

What do you think?