WGB 

I got this Park tool and I can find nothing online.

Marked Tire/Chain-ger Park Tool USA
Pat Pending

I assume that it can be used as a backup tire lever but it seems to be primarily something to do with chains (for changing chains?). It looks like it snaps on a chainstay so might act as a block to prevent chain slap with a slightly loose chain??

Not shown in catalogues and can't find any for sale so clearly discontinued. I was going to jam it on a frame for chain slap but thought I'd ask here first what it really is for??

smd4

There’s an old listing for one on eBay, in the original packaging. Says it has "three handy uses:" tire lever, device to put the chain back on the "sprockets" (actually, they meant chainrings) (apparently so you don’t need to touch the chain, if the chain falls off--that's what that hook is on the end opposite the tire lever), and a “chain compressor” to make it easier to break the chain by giving the chain some slack. Looks like you hook the chain on the hook end, form a loop, and then hook the chain back onto the other hook that's on the opposite side of the frame clip (over the "ger" text).

Pretty funny that they made a tool that keeps you from having to touch that icky chain to put it back on the chainrings, but you still have to manhandle the chain if you want to use the compressor function!

There are accompanying photos on the back of the package showing how to use it. Packaging looks 1970s-ish, but no dates that I can see. Made in USA.

"Always with you--clips onto any frame - 1" - 1 3/8" Dia."

Weird--I can see the listing and accompanying photos on my phone, but when I run the same search on my laptop, I get no hits. If you google the listing number you might be able to see an image:

255321068855

WGB 

Thank you!
I was standing there by my bike, twisting it and placing everywhere on the frame. I'll try It in my garage one of these days to see what it works like. I have a feeling it's a tool looking for something to fix....

grizzly59

Been wrenching for 50 years, never seen or heard of that one. Hey you! Get offa my lawn!

smd4

I know, right?

Crankycrank

smd4 got it right in post #2. I have one. Can't remember how I came into possession of it as I don't think I would ever buy one. I would probably use it if it wasn't so hard to find in my tool chest which takes more time looking for it than it takes to do the job without it.

Andrew R Stewart 

We sold a few way back when. This was fairly early in the whole mini tool development. I carried one for a while too on my bike but don't think I ever used one "in anger" (I rarely got flats off road and am kind to my drivetrains). Around the same time the Cool Tool was brought out. A very opposite type of device, weighing a lot and doing a lot too. I still have a Cool Tool w/ its hex wrench/screwdriver tools in my collection. Andy

Cool Tool: 'The' Multipurpose Bicycle Repair Tool | Digital Hippie

WGB 

Since Andy didn't show the tool here it is. Definitely weirder than mine. probably more useful than mine too



​​​​​​