A customer brought in a Bora One for service.
There's a massive failure happening with the new shaft on the front hub, so
if necessary, they said I could replace the hub shaft and wanted me to fix it.
↑This one
To cut to the chase, the hub shaft replacement wasn't necessary.
I have spare parts in stock just in case.
When I held the right side with a dedicated 14mm wrench,
the left end came off with a 5mm Allen key.
The left end is falling apart, so I'm replacing it.
I removed the right end, applied high-strength threadlocker, and tightened it firmly.
On the left end, I applied grease to the threads and hand-tightened it, then
with the tool, I gave it just a slight additional snug so it won't naturally loosen.
When an Allen key is used on both left and right ends to turn,
I've made sure the left side always comes loose first.
So even if the gripping surface on the right shaft (which isn't used) is stripped, it doesn't matter.
That's why I didn't replace the hub shaft.
Perfectly centered with virtually no runout.
The rear wheel was the same.
Next, the rear wheel.
Nothing special to report. No play in the hub.
The USB marking on the rear hub body is
applied in the correct orientation when viewed from the right side,
but on the front hub body it was upside down, so
while I was at it, I flipped the hub shaft orientation around.
At my own discretion, since it's not an expensive part,
I replaced the valve stem sealing ring.
In the image above, the left one is what I recently replaced for a different bike,
and the right one came with this Bora One,
but even when the left valve stem sealing ring's tabs are oriented front-to-back,
it has started making a rattle when the valve shakes.
It looks like wear has developed from long-term use.
This is probably not just my imagination.
It's not doing its job of preventing the valve rattle noise,
so I replaced it with a new pipe-type valve stem sealing ring of the same part number.
The biggest problem with the two-tab design is
that sometimes the tube valve doesn't pass through smoothly.
With the pipe type, that problem doesn't occur.
Just in case they can be used as spare parts,
I've returned the left end and the two-tab valve stem sealing ring to the customer.
There's a massive failure happening with the new shaft on the front hub, so
if necessary, they said I could replace the hub shaft and wanted me to fix it.
↑This one
To cut to the chase, the hub shaft replacement wasn't necessary.
I have spare parts in stock just in case.
When I held the right side with a dedicated 14mm wrench,
the left end came off with a 5mm Allen key.
The left end is falling apart, so I'm replacing it.
I removed the right end, applied high-strength threadlocker, and tightened it firmly.
On the left end, I applied grease to the threads and hand-tightened it, then
with the tool, I gave it just a slight additional snug so it won't naturally loosen.
When an Allen key is used on both left and right ends to turn,
I've made sure the left side always comes loose first.
So even if the gripping surface on the right shaft (which isn't used) is stripped, it doesn't matter.
That's why I didn't replace the hub shaft.
Perfectly centered with virtually no runout.
The rear wheel was the same.
Next, the rear wheel.
Nothing special to report. No play in the hub.
The USB marking on the rear hub body is
applied in the correct orientation when viewed from the right side,
but on the front hub body it was upside down, so
while I was at it, I flipped the hub shaft orientation around.
At my own discretion, since it's not an expensive part,
I replaced the valve stem sealing ring.
In the image above, the left one is what I recently replaced for a different bike,
and the right one came with this Bora One,
but even when the left valve stem sealing ring's tabs are oriented front-to-back,
it has started making a rattle when the valve shakes.
It looks like wear has developed from long-term use.
This is probably not just my imagination.
It's not doing its job of preventing the valve rattle noise,
so I replaced it with a new pipe-type valve stem sealing ring of the same part number.
The biggest problem with the two-tab design is
that sometimes the tube valve doesn't pass through smoothly.
With the pipe type, that problem doesn't occur.
Just in case they can be used as spare parts,
I've returned the left end and the two-tab valve stem sealing ring to the customer.