This one worries me.
 

http://www.fixedgeargallery.com/2004/g/gibson.htm

A chain tensioner on a fixie with only one brake. Hopefully he/she does not run into the tacoma in the background.

paging doctor sketchy, your ride is here...

I dunno, it doesn't look like he's got much tension on it - the chain is pretty straight when it's on the fixed side... Obviously it's been working for him...

I'd get rid of the tensioner, but as you mentioned, it is pretty slack tensioned.
As long as he doesn't backpedal it should work. I like the overall look and also
enjoy riding an off-road fixed/cyclocross bikes.

if you read the description, he says that he uses the tensioner to take up slack in the 40x17 freewheel offroad combination.
no rear brake? freewheel? offroad? paging Dr. Endo?

Some of us older riders are trying to give up the habit of using imovable objects like parked trucks or trees as stopping 'aids'.

Seems to me if the tensioner is engaged in the fixed gear (as it is in the photo), sufficient back pressure will tension the chain and tend to try to force it into a straight line through the der. Perhaps it goes *ping*!

Paging Dr. Octagon, Dr. Octagon...

Oh sh1t, there's a horse in the hospital.

I'm a little curious how the 3-leading 3-trailing spoke pattern in the rear is holding up to fixed riding... I love the pattern but I don't know if I would trust it on a brakeless bike.

I just had a two leading, two trailing 32 spoke wheel built onto a Mavic OR10 tubular rim
with a Dura Ace track hub. It seems plenty strong. I weigh about 175, so I don't expect an problems.

You can stop yourself just fine with one front brake.

Got em on my fix and love em.
No worries

i'd maybe ride it free on the street, but not off road and not fixed.

I'm more worried about the disk brake on a radial spoke pattern. I hope he knows what he is doing.

it looks like the disc side is at least 2x. he might have half a brain in his head after all.

He says it's laced 3x but I only counted 2 (though it's kind of hard to see). Anyhow, at least not radial on the brake side.

Personally radial doesn't do it for me visually and it does nothing for the mechanics of the wheel, so I don't really see the point.

I guess I missed that. Personally I like radial for a front wheel. Just a matter of personal taste.

But radial lacing makes the wheel lighter!
By a few grams.