Nomu Lab Diary

Changed the Cannondale 650B rear wheel to 700C

Wheels again today (et cetera).
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Continuing from yesterday, I'm rebuilding the rear wheel.

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The rim is the same as the front wheel.
Hub from the stock wheel: 28H
Black #14 plain 6x6 JIS laced.

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Before and after rebuild, both rims are low-profile,
so I was able to stack them together.

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Since this rear wheel is for a Cannondale AI offset frame,
the rim needs to be offset 6mm toward the non-drive side.
So the spacing between the left dropout and the center gauge probe becomes 12mm.
When I checked before disassembly, the original state was 11mm though.

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↑Non-drive side
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↑Drive side
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↑Non-drive side
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↑Drive side
The spokes tend to be even shorter than the front wheel.
Without the AI offset correction, the spoke-to-nipple end face relationship
would be about equal left and right at a certain spoke length.
If the non-drive side spokes were then tightened more to offset for AI,
the non-drive side spokes should *appear* longer visually.
But in reality, it was the opposite. Makes no sense.

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It's built.

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28H all-black CX Sprint 6x6 JIS laced, no cross-lacing.
I determined cross-lacing wasn't necessary.
It could be done, but if I were to do it, it would be full lacing on both sides.
It's been a while since I've built a rear wheel with identical spoke count and gauge on both sides.
The spokes could have been all Competition instead of all CX Sprint,
but I went with CX Sprint because it has a lower spoke weight ratio,
which also helped me think about the wheel's overall lightness.

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Set up for AI offset compatibility.

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Both before and after rebuild were 6x6 JIS laced,
and the marks on the hub flange from inpoke and outpoke spokes
I followed as they were in the original state on both sides.

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↑Non-drive side
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↑Drive side
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↑Non-drive side
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↑Drive side
Both sides have the nipple end flush with the rim.

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↑Front wheel rim actual measured weight before and after rebuild

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↑Rear wheel rim actual measured weight before and after rebuild
Accounting for the weight difference between brass and aluminum nipples,
the total comes to right around 100 grams.

The reason why the Crest MK4 rim being an offset rim is not welcome
is a long topic, so I'll cover that in a separate post.

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