Another day with wheels (and so on).
I received a front wheel from a customer—a Racing Zero.
↑The valve hole had expanded due to corrosion, so they wanted to replace the rim.
Since tubeless tires are no longer usable, I suggested that we could just patch the area around the valve hole with tubeless tape, but they decided to go with a full rim replacement.
↑This is the rim from a Nomo Lab Wheel No. 5, and white corrosion appears quite noticeably around the valve hole area (though not so much at the rim holes). The potential difference with the brass valve seems to be a major factor.
When I shook the rim, it made sounds like hard objects—small stones or metal fragments—were inside, so I shook them out. But what actually came out was soft sealant debris. The moisture in the sealant may also be contributing to the corrosion.
↑The 2WAY-FIT spare rims come with tubeless valves included. The top image is from the C17 rim era and the bottom is from the C15 rim era, each with tubeless valves suited to their respective periods. The C15 comes with a brass valve with a square base rubber (equivalent to Campagnolo WH-SH001), while the C17 comes with a black-anodized aluminum valve with a round base rubber (equivalent to Campagnolo WH-SH101).
The WH-SH101 is nominally designated for C17 rims, but it's not a shape specifically tailored to that—it's just the first introduction of that style—so it can also be used on C15 rims. There are also aluminum tubeless valves from brands like Stan's, and from my own experience using aluminum valves with DT aluminum rims and sealant, aluminum valves appear less prone to galvanic corrosion.
I replaced the rim.
There were a lot of nipples on the verge of seizing, but since the spoke heads are hooked-type, I could remove the hub by loosening only the nipples on roughly half the circumference. Once freed from spoke tension, those nipples become easier to turn since spoke tension is no longer a factor preventing them from loosening... However, there were 3 nipples that remained stubbornly seized.
I deliberately snapped one of them off.
I received a front wheel from a customer—a Racing Zero.
↑The valve hole had expanded due to corrosion, so they wanted to replace the rim.
Since tubeless tires are no longer usable, I suggested that we could just patch the area around the valve hole with tubeless tape, but they decided to go with a full rim replacement.
↑This is the rim from a Nomo Lab Wheel No. 5, and white corrosion appears quite noticeably around the valve hole area (though not so much at the rim holes). The potential difference with the brass valve seems to be a major factor.
When I shook the rim, it made sounds like hard objects—small stones or metal fragments—were inside, so I shook them out. But what actually came out was soft sealant debris. The moisture in the sealant may also be contributing to the corrosion.
↑The 2WAY-FIT spare rims come with tubeless valves included. The top image is from the C17 rim era and the bottom is from the C15 rim era, each with tubeless valves suited to their respective periods. The C15 comes with a brass valve with a square base rubber (equivalent to Campagnolo WH-SH001), while the C17 comes with a black-anodized aluminum valve with a round base rubber (equivalent to Campagnolo WH-SH101).
The WH-SH101 is nominally designated for C17 rims, but it's not a shape specifically tailored to that—it's just the first introduction of that style—so it can also be used on C15 rims. There are also aluminum tubeless valves from brands like Stan's, and from my own experience using aluminum valves with DT aluminum rims and sealant, aluminum valves appear less prone to galvanic corrosion.
I replaced the rim.
There were a lot of nipples on the verge of seizing, but since the spoke heads are hooked-type, I could remove the hub by loosening only the nipples on roughly half the circumference. Once freed from spoke tension, those nipples become easier to turn since spoke tension is no longer a factor preventing them from loosening... However, there were 3 nipples that remained stubbornly seized.
I deliberately snapped one of them off.