Bikerumor Monday Mystery Pic

Looks like a seatpost to handlebar stem for a bike with a third wheel.

It’s a stem, just not sure since the color is throwing me off. Could be everything from Onza to Allsop/Softride. They used that color. That or AC(Adventure Components). They made a kit back in the 90’s that had a stem, crank, fork pieces, hubs. All the stuff they made and it was color coded for the three different Rock Shox colors at the time. Red, Gold and Yellow.

I am going with an AC Stem.

definitely 90s, definitely a stem, almost definitely for mountain bikes… I was totally into all the innovations back then but just can’t remember someone doing cutaways from billet over the standard tubular variety ála Ringlé… plus, this doesn’t look like one of the very best in terms of machining…

ugh… not ringing any bells

port side blinker bearing…Where do I pick up my prize?

Specialized stem.

I’m with Professor Velo — I know what it’s NOT (not a Cinelli, definitely), but can’t put a finger on what it IS.

The steer clamp looks skinny, like its for a 1″ steer tube. If you flip it over, that would put the bar clamp bolt in a typical position for a road bike stem. So I would guess it was meant for a road bike, for whatever that is worth.

I’d (almost) go with Db and say its a prototype (I think I can see welding by the bar clamp) for a cast magnesium stem by Kirk Precision, although think Kirk predated Aheadsets, so…… ???

Definetly Two Wheel Performace (TWP)!!

Nuke Proof.

Looks like a KHS Power Tools stem to me.