A customer brought in a Kysrium carbon tubular rim model wheel for service.
When we talk about "Kysrium," it's not referring to the aluminum spokes, but rather to the Isopulse pattern (radial lacing on the freewheel side), so this wheel follows that design.
Starting with the front wheel. The centering was off only very slightly and there was almost no run-out, so I thought it would be easy to correct with some simple truing on one side.
Many spokes were twisted, so when I applied a spoke press tool and twisted a spoke gently, there was a loud cracking sound. It turned out that the spoke head wasn't fully seated in the rim slot, yet the wheel was built with tension applied to it. Looking at the image above, you can see the spoke at an angle—that's the problem spoke. The neighboring spoke also isn't fully seated in the slot.
↑Right here.
↑Incorrect state
↑Normal state
With this one too, when I twisted the spoke gently, the spoke head settled into its proper position. And even though there was supposed to be almost no run-out, severe lateral wobble appeared. I don't mean to scare anyone, but if this had been used without inspection, the moment you stood up and pedaled hard, you'd hear an awful noise from the hub, and afterwards even under no load, the wheel would rub so badly it would make a scraping sound. It was extremely dangerous.
If you're using a wheel with this same hub, I'd recommend checking yours again.
The rear wheel had a slight centering offset but almost no run-out,
and it's fixed now.
When we talk about "Kysrium," it's not referring to the aluminum spokes, but rather to the Isopulse pattern (radial lacing on the freewheel side), so this wheel follows that design.
Starting with the front wheel. The centering was off only very slightly and there was almost no run-out, so I thought it would be easy to correct with some simple truing on one side.
Many spokes were twisted, so when I applied a spoke press tool and twisted a spoke gently, there was a loud cracking sound. It turned out that the spoke head wasn't fully seated in the rim slot, yet the wheel was built with tension applied to it. Looking at the image above, you can see the spoke at an angle—that's the problem spoke. The neighboring spoke also isn't fully seated in the slot.
↑Right here.
↑Incorrect state
↑Normal state
With this one too, when I twisted the spoke gently, the spoke head settled into its proper position. And even though there was supposed to be almost no run-out, severe lateral wobble appeared. I don't mean to scare anyone, but if this had been used without inspection, the moment you stood up and pedaled hard, you'd hear an awful noise from the hub, and afterwards even under no load, the wheel would rub so badly it would make a scraping sound. It was extremely dangerous.
If you're using a wheel with this same hub, I'd recommend checking yours again.
The rear wheel had a slight centering offset but almost no run-out,
and it's fixed now.