retro ryder headset 1 1/8 fork in 1 headtube?!

http://www.genuinebicycleproducts.com/parts.html

http://www.flickr.com/photos/17534977@N00/sets/72157628195500205/

Has anyone every used a Retro Ryder headset, as in the link above?

These claim to enable you to use a 1 1/8 fork in a 1 headtube. Is this possible, and are there any other companies that make these?

i guess it means the bearings are rather small though?

There was a chris king headset that did this "devolution" I think it was called and being king it's probably quality expensive though

^^^ the claim is for American Standard 32mm inside diameter head tube fitting found on old BMX bikes and the like. Standard road / track bike are approximately 30mm ID. The steerer on a 1 1/8 fork is approximately 28.6mm so that would leave you about 0.75mm wall thickness on the cups were they go into the head tube with a 30mm ID head tube. Probably more like 0.5mm with some clearance for the steerer tube. Possible but I think you'd struggle to fit one with application of differential expansion fitting.

^^ the bearings could be normal size as it's an external headset.

There was a chris king headset that did this "devolution" I think it was called and being king it's probably quality expensive though

devolution is for 1" forks in 1 1/8 heatubes, so the other way

^ ahh i see!