I tried searching - not too much info. I'm just curious how they weigh so little. They look beefy and they have high flanges, with cutouts in the front hub. They claim 105 grams for the front, 180 grams for the rear. To put that into perspective, the low flange Dura Ace hubs are 203 front and 298 rear. Phil Wood hubs are 225 front and 389 rear. What's going on here? That whole hubset weighs less than one low flange Dura Ace rear hub. Did I miss something?

Hub bodies filled with hydrogen.

Nurr.

what i would like to know is how a rear phil hub gets to damn near one pound.

Phils are heeeeeavy. Common knowledge.

I believe that Phil hubshells are CNC machined, and Shimanos are cold forged. Cold forged is stronger, so perhaps Phil Wood makes up for that with more material. Of course, that line of reasoning would not hold vis a vis Chris King. Who the hell knows?

I'm guessing aluminum axles versus steel, but I could be wrong.

I've got an AC front hub. The weight is kept low by using a smaller diameter spindle (steel) and thin alloy. The hubs aren't strong and the bearings are rubbish. Better for a Weight Weenie build than a street bike build.

good to know... they do have an upgrade to ceramic bearings...but I don't know how much that would improve them. I don't think there are many weight weenies here. Carbon in fashion her, not to save weight.

looks like hollow axles.
possibly aluminum ones