Nomu Lab Diary

Rebuilt a Shimano PRO RC50 wheel

Another day, another wheel (and so on).
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A customer dropped off the rear wheel of what I thought was a Shimano PRO RC80.
UPDATE: It's an RC50. Sorry about that, and thanks for pointing it out.
I've corrected the title and post accordingly.


The rider said the wheel felt a bit sluggish,
and asked me to improve it by changing the spokes and lacing pattern.

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The spokes were the same on both sides—some Sapim CX whatchamacallit—
and it was laced four-cross.
I'll write a separate post about the CX whatchamacallit stuff since there's a lot to cover.

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Not related to the rebuild itself, but
the rim tape width wasn't right, and there were several sketchy spots.

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The nipples before the rebuild had
a threadlocker that had strong initial holding power, but
became pretty much useless if you had to readjust later.

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↑As you can see, there's no threadlocker at all
between the nipple and spoke threads.

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I cleaned up the 12 spokes on the freehub side since I was reusing them.

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All laced up.

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I laced it with an FH-6600 24H hub, CX whatchamacallit on the freehub side, and CX-RAY half-CX whatchamacallit four-cross with radial lacing on the non-freehub side.

This CX whatchamacallit isn't actually a CX.
The 6600 hub doesn't have the aero slit hole version, so CX won't work on it.

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Before the rebuild, it had 16mm brass nipples, but
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after the rebuild, I switched to 14mm aluminum nipples.
These come with the CX-RAY.
I thought 12mm nipples (the standard DT size)
wouldn't have much clearance for the wrench, so I went with these instead.
There were nipple washers in use, so I reused them,
but that means the nipples sit about 0.5mm deeper now.

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