A customer brought in the front wheel of a Corima Aero Plus for me to work on.
They'd brought it in a little while back for a front and rear wheel inspection,
but there was a problem with the front wheel so I didn't do any truing work.
It's a front hub with inpoke catch-style lacing that's common on Corima bikes, but—
there's a crack in it.
I've seen a few cases of this with aluminum hubs,
↑like this one
↑and this one
But this is my first time seeing it on a carbon hub.
Looking closely at those aluminum hubs, they're actually not the same.
There's a difference in how the transition from hub body to flange is either angular or smooth.
When I removed the axle nut, the hub axle with the bearing
on the side where the crack was came out without any resistance.
That's because the crack had progressed all the way to the bearing press-fit section.
Unfortunately, that's the end of it.
This front wheel is 18H, and it has pair-spoked phasing, so
it can only be laced with a Corima 18H pair-spoked front hub.
That's what I figured earlier, but...
The customer sourced a hub themselves and brought it in.
It turns out that when they contacted Corima directly,
the warranty covered it!
The hub is different too—it looks like a revised version.
The gray section is removable, and I thought,
"Oh no, is this another inpoke catch-style hub?"
But no—it was straight-spoke spec.
The hub flange thickness has become abnormally thick.
I wonder if something bad happened to them (playing dumb).
This is neither here nor there, but I love this quick release that came with the hub
Now, the original wheel uses catch-style lacing, so
loosening the nipples about half a turn allows you to extract the hub.
Since I couldn't reuse these spokes,
I checked my shop's straight-spoke inventory, but
we didn't have enough.
They're laced with CX-RAY equivalent spokes
(the original catch-style hub can use CX equivalent spokes too,
but the revised hub uses through-spokes with no slot, so CX equivalent spokes are incompatible),
so normally I'd handle this with "310mm threaded-end no-thread spokes cuttable down to 270mm in CX-RAY straight spec,"
but since I have the hub and rim, I can calculate the exact spoke length.
Rather than place a special order, I might as well order spokes cut to exactly the right length from the start.
I calculated the needed length and ordered exactly 18 spokes at that length,
plus several dozen 310mm repair spokes as well
(it's lazy, but they're necessary inventory anyway).
CX-RAY through Japanese distributors comes in even-numbered 2mm increments,
but I cut the ordered spokes down by 1.5mm for use.
Since my calculations were correct, I was able to source
the shortest length that still gives me the needed spoke length within range.
Got it laced up.
The revised hub body has CORIMA printed on it, so
I'm lacing it to match the phase visible from the valve hole.
They'd brought it in a little while back for a front and rear wheel inspection,
but there was a problem with the front wheel so I didn't do any truing work.
It's a front hub with inpoke catch-style lacing that's common on Corima bikes, but—
there's a crack in it.
I've seen a few cases of this with aluminum hubs,
↑like this one
↑and this one
But this is my first time seeing it on a carbon hub.
Looking closely at those aluminum hubs, they're actually not the same.
There's a difference in how the transition from hub body to flange is either angular or smooth.
When I removed the axle nut, the hub axle with the bearing
on the side where the crack was came out without any resistance.
That's because the crack had progressed all the way to the bearing press-fit section.
Unfortunately, that's the end of it.
This front wheel is 18H, and it has pair-spoked phasing, so
it can only be laced with a Corima 18H pair-spoked front hub.
That's what I figured earlier, but...
The customer sourced a hub themselves and brought it in.
It turns out that when they contacted Corima directly,
the warranty covered it!
The hub is different too—it looks like a revised version.
The gray section is removable, and I thought,
"Oh no, is this another inpoke catch-style hub?"
But no—it was straight-spoke spec.
The hub flange thickness has become abnormally thick.
I wonder if something bad happened to them (playing dumb).
This is neither here nor there, but I love this quick release that came with the hub
Now, the original wheel uses catch-style lacing, so
loosening the nipples about half a turn allows you to extract the hub.
Since I couldn't reuse these spokes,
I checked my shop's straight-spoke inventory, but
we didn't have enough.
They're laced with CX-RAY equivalent spokes
(the original catch-style hub can use CX equivalent spokes too,
but the revised hub uses through-spokes with no slot, so CX equivalent spokes are incompatible),
so normally I'd handle this with "310mm threaded-end no-thread spokes cuttable down to 270mm in CX-RAY straight spec,"
but since I have the hub and rim, I can calculate the exact spoke length.
Rather than place a special order, I might as well order spokes cut to exactly the right length from the start.
I calculated the needed length and ordered exactly 18 spokes at that length,
plus several dozen 310mm repair spokes as well
(it's lazy, but they're necessary inventory anyway).
CX-RAY through Japanese distributors comes in even-numbered 2mm increments,
but I cut the ordered spokes down by 1.5mm for use.
Since my calculations were correct, I was able to source
the shortest length that still gives me the needed spoke length within range.
Got it laced up.
The revised hub body has CORIMA printed on it, so
I'm lacing it to match the phase visible from the valve hole.