Industry Nine announced their XD1 driver body for SRAM’s XX1 1×11 drivetrain in October, and now we’ve got our hands on one to get our own XX1 group test underway.

Before installation, though, we snapped a few detail pics, actual weights and follow up with some install notes. I’m mounting these on my 2-1/2 year old Industry Nine wheels, which have held up incredibly well. Industry Nine has a rebuild manual that, despite a layout that could be improved a bit, is comprehensive enough to walk you through swapping the freehub bodies.

Click through for pics and weights…

The XD1 body is 11g lighter than a standard one, probably 10g if you take away the fresh grease on the original. That cuts down on the almost 60g added weight of an XX1 cassette compared to XX.

The XD1 is a good bit shorter, leaving room for the smaller cogs to sit on the axle.

Industry Nine’s freehubs have two internal sealed cartridge bearings between it and the axle, and one much larger bearing between it and the hub shell.

Six pawls, each with three teeth, surround the inside of the body. Each is held in place with a thin metal spring that both retains the pawl and helps it spring back. The design requires a thinner grease to ensure smooth action – they recommend DuMonde Tech. To see how the hubs, pawls and everything else is made in house (except bearings), check out our factory tour post!

Basically, you remove the driveside axle cover, loosen and unthread the non-drive dust cap, then tap the axle and freehub out. Once that combo piece is out, you pull (or tap with a rubber mallet if necessary…which it most likely will be) the axle out of the freehub body.

To install the XD1, reverse the process. The only issue we ran into was popping the outermost bearing out of the XD1 shell when reinserting the axle. It goes back in easy enough, but being able to see our “before” photos eased our mind that it wasn’t supposed to sit flush inside the XD1 body.

Want one? They’re available now for $100 for the body with internal bearings. The complete refit with pawls, springs and external bearing is $200 as shown here, but not required. You can swap over the pawls and bearings from your existing freehub body with perfect compatibility.

The finished product!

Now, to get the complete group installed and start riding!