A guy calling himself FJT left a disc wheel with me for work.

It's an Araya Kevlar disc wheel.
"I'm not the first owner so I don't really know, but when I put it on the frame something was obviously wrong"—that's what he said.

↑right

↑left
The over-locknut dimension measured about 121.3mm.
A bit wide, but nothing that's a problem.
The hub axle has washers and nuts installed "with equal dimensions on both sides."

↑left

↑right
The right side end nut is installed backwards.
The serrations that grip the frame are facing inward.
When I checked the wheel center,


it was way off.
Making the washers equal on both sides was the mistake.
Same with the end nut issue—there's clear evidence that someone who doesn't understand wheel structure at all has been tinkering with this. The bearing adjustment wasn't set up right either.


The center is pretty much dialed in now.
Strictly speaking, there's still about a paper thickness of runout, but there's not much you can do about that.

It's an Araya Kevlar disc wheel.
"I'm not the first owner so I don't really know, but when I put it on the frame something was obviously wrong"—that's what he said.

↑right

↑left
The over-locknut dimension measured about 121.3mm.
A bit wide, but nothing that's a problem.
The hub axle has washers and nuts installed "with equal dimensions on both sides."

↑left

↑right
The right side end nut is installed backwards.
The serrations that grip the frame are facing inward.
When I checked the wheel center,


it was way off.
Making the washers equal on both sides was the mistake.
Same with the end nut issue—there's clear evidence that someone who doesn't understand wheel structure at all has been tinkering with this. The bearing adjustment wasn't set up right either.


The center is pretty much dialed in now.
Strictly speaking, there's still about a paper thickness of runout, but there's not much you can do about that.