...how this works?

looks to me like a bike. you pedal it and it goes...

the chain?
the lockring?
the tug?
the drop out?
or the photograph overall?

The 'tug'
It looks to me like two allen-key bolts screwed into a replaceable trackend.
I can't see anything actually holding the axle.

it would help to know the frame MFR

Giant 2004 TCR track
It's on ebay right now.

I think you got a bad link there techone. I almost looks like you can tighten down the axel and then adjust the tension. Not sure why this would be better but it does look cool. I would like to see it in person.

Well, if you look at this picture of it, you can see the actual dropouts. Those tensioners not only lay over the dropout from the side, but also surround it in back, if that makes sense.

What don't you understand.

The axle has a female thread and there is an allen bolt that secures it. Look closely at the end of the axle, that's and allen bolt.

The two smaller allen bolts are part of the chain tensioner. The chain tensioner loops over the axle and comes to the back of the dropout.

How this works is you keep the axle bolt loose. Then you screw in the two chain tensioner bolts. These push against the frame (the ends of the dropout) that's why there are two one top and one bottom.

This pull the chain tensioner back. Since this is over the axle, it pulls the wheel backwards as well. When you have the desired chain tension, you tighten down the axle bolt.

Viola, tight chain and a rear wheel that WILL NOT move!

Chain tensioners can be as cheap as $10 or as expensive as $50.

Go to www.danscomp.com it's a BMX website and look there for some!

L8R

No *****. I know phil's and I have a goldtec hub.
Similiar to an MKS tug or the hundreds of similiar types? I still don't see anything that is 'attached' or 'wrapped' or 'looped' to or around the axle.
Damn you are one smartass muppet!
I'm glad 'everybody' assumes that if someone has a question that the person is an imbecile. That way 'everybody' knows everything and doesn't ever need to ask anything or even question anything. *****ing sheep

Still, to me it just looks like two bolts stuck into a replaceable trackend. and doesn't look like it can tug anything.

(BTW, 'everybody' doesn't mean everybody)

smartass muppet.

nice.

I guess I could've worded the original post a little better. But it seemed obvious to me that the two allen key bolts don't look like any normal chaintug I've seen.
If it's some new stealth, built in type chaintug, then I really like it!

Cynikal and Schwinnbikelove posts was the only one that hit on what I'm talking about, and seems along the same line with what I'm on about.

I used to have two bolt tensioners very similar to this one except they were more on the rather than in the dropouts. As I posted previously, the two bolt set up is a pain in the neck and a female dog to adjust. Once you have one screw tight. you need to tighten the nut down, then the other screw needs to be tightened wich makes the first on a little loose again so you need to adjust that a little more but then the chain is to tight so have to loosen it again and so on and so forth ad nauseam.

Now I have those MKS NJS tensioners and they are soooooooooo much nicer.

Installed a pair similar to those on my brothers IRO. Works great. The tensioner itself has a hole that you don't see in the pic for the axle to slide through. It's just hidden or covered over by the nut/head of the allen.