Another day with wheels (and so on).
A customer dropped off a rear wheel with a 38mm carbon tubular rim.
The hub is a separated twin of a Leaf hub (which one is the older model is unclear).
It's a 24-hole all-black CX-RAY Yonzero build,
but the customer wants it converted to semi-comp with a 4-spoke trailing pattern.
The spokes are clearly short, so I unscrewed the nipples on 23 holes and pulled the last one out of the rim without turning the nipple at all.
This is the non-freewheel side, but the spoke is abnormally short.
The threadlocker is holding strong—I can't even turn the nipple by hand without using tools to break it loose—so it wouldn't have loosened when I disassembled other sections.
There's a special washer between the nipple and rim, so accounting for that, the spoke would need to be about 0.5mm longer, but even without that correction factor, it's way too short.
Since the freewheel side will be a 4-spoke pattern with the same rim and hub, if the original spoke length were reliable, I could just copy it.
But of course it's not reliable, so I calculated the proper length from actual measurements of the rim and hub.
When I aligned them at the threaded end,
you can see this big difference at the spoke head.
The DT-marked Competition spokes I'm using as the new ones are 273mm.
The theoretical value was 272.51mm, which already includes compensation for the nipple washer.
Even accounting for that, you can clearly see how short the original CX-RAY spokes are.
Built it up.
Black semi-comp 4-spoke with trailing pattern and wire tie.
Since I rebuilt it right in front of the customer, I had him confirm that even without the wire tie, it's noticeably tighter and more solid than before the rebuild.
A customer dropped off a rear wheel with a 38mm carbon tubular rim.
The hub is a separated twin of a Leaf hub (which one is the older model is unclear).
It's a 24-hole all-black CX-RAY Yonzero build,
but the customer wants it converted to semi-comp with a 4-spoke trailing pattern.
The spokes are clearly short, so I unscrewed the nipples on 23 holes and pulled the last one out of the rim without turning the nipple at all.
This is the non-freewheel side, but the spoke is abnormally short.
The threadlocker is holding strong—I can't even turn the nipple by hand without using tools to break it loose—so it wouldn't have loosened when I disassembled other sections.
There's a special washer between the nipple and rim, so accounting for that, the spoke would need to be about 0.5mm longer, but even without that correction factor, it's way too short.
Since the freewheel side will be a 4-spoke pattern with the same rim and hub, if the original spoke length were reliable, I could just copy it.
But of course it's not reliable, so I calculated the proper length from actual measurements of the rim and hub.
When I aligned them at the threaded end,
you can see this big difference at the spoke head.
The DT-marked Competition spokes I'm using as the new ones are 273mm.
The theoretical value was 272.51mm, which already includes compensation for the nipple washer.
Even accounting for that, you can clearly see how short the original CX-RAY spokes are.
Built it up.
Black semi-comp 4-spoke with trailing pattern and wire tie.
Since I rebuilt it right in front of the customer, I had him confirm that even without the wire tie, it's noticeably tighter and more solid than before the rebuild.