Bike Hugger 

Is it for measuring seatpost diameters?

Looks ‘interesting’
What is stamped on it, I can see it from the picture, just not enough of it.
My thoughts as to what it is:
- Part of a frame straightening rig
- Part of a bicycle stand
- Adjustment tool for customers attitudes(Think Belaying pin)

I am resisting running the picture through Google Goggles!

Thanks!
Matt

Its used when you remove a fork from a frame for service. This tool is used as a dummy steerer tube to keep the top headset cap, spacers and stem on the bike (not lost) and avoid potential frame damage from a dangling handlebar.

Its used when you remove a fork from a frame for service. This tool is used as a dummy steerer tube to keep the top headset cap, spacers and stem on the bike (not lost) and avoid potential frame damage from a dangling handlebar.

I think it’s to set a ball-bearing headset race on fork crown.  You set the rounded edges on the concave part of the race, place the race and tool over the steerer tube and pound on it with a hammer forcing the race onto the raised lip at the bottom of the steerer tube.

It’s NOT a crown race setter…diameter’s too small for even a 1” steerer.

Beyond that, I have no idea…but I like mgindle’s guess.

I should correct myself…mgindle’s is NOT a guess—he’s right on the money.

It’s made by EVT (Efficient Velo Tools) and is called the “fork/stem transfer tool”:
http://www.biketoolmaker.com/Site/Inflaters,_Valve_Core,_Hub_support,_Nipple_Loader,_Axle_Vise,_Poker,_BB_Cup,__Fork_Service.html

Hmm, conjecture, well might as well add mine.  The knurling at one end is our most substantial clue, followed closely by the machined taper.  The knurling is clearly used to break the taper-seat while using the tool, so it goes ‘into’ something.  Back in the day we had an very similar tool used to repair a head-tube after a threaded head-set had been maladjusted, and the head-tube became ovalized, or elliptical, from the steer-tube baning back and forth under braking conditions.  Forcing a tapered mandrel like this into the head-tube would make the head-tube round again, then another tool was used to hand-machine the ID of the head-tube until a head-set of the next size up fit, as this would ‘stretch’ the head-tube.  Judging by the small diameter this probably fits some ancient, teeny, European (French or English) head-tube, and is also a partial explanation of why it might be away form it’s ‘set’, and rolling around loose in a shop.  It was probably rarely used.

Wish I knew the exact diameter.  The comment about it being used to install the crown-race on a threaded fork was a good guess.  But those tools aren’t tapered, and therefore they’re not made with knurling like that either.  Plus, the ID of the tool doesn’t look large enough to fit over the steer-tube. 

This could also be a ‘special’ tool for working on suspension.  I wouldn’t know as I ride ‘real’ bicycles, which of course don’t have suspension :-) ! 

Pretty sure that’s a head-tube repair tool for the money Alex!!

I’m leaning this way with you but wanted to poke some holes.  Consider, that taper is machined into the tool, you can clearly see the machining marks.  Why?  The taper isn’t critical for purposes of stack-transfer, and tools like that usually have the taper cast into the tool, as that’s much cheaper to do.  Why the machined taper?  Plus, the smallest threadless head-set head-tubes are an inch at least.  This tool doesn’t look any bigger than seven-eighths or even three-quarters, so I’m not as sold as you are.

I didn’t pay much attention to the stack-transfer tool idea at first, but your comments led me to think more on it.  Wish I’d have done that prior to putting my money on head-tube repair tool.  It is interesting though, if it should be a stack-transfer tool, that the manny’d machine that taper in.  So much easier and cheaper to just cast the tool that way.  This tool has been clearly cast, by the way, and not machined out of billet.  Probably another clue.