A customer brought in the latest Racing Zero hub where the front hub bearing diameter
has become smaller than the rear hub.
The reason I'm mentioning the wheel model year right at the start is
because something happened.
When the customer tried to grease the hub,
the right end nut came off first, and when they grabbed the right end of the shaft
they stripped it.
When I inserted a 5mm Allen key from both sides,
the right side loosened first as well.
Since the customer approved replacing the hub shaft,
there's a rough method to remove it, so
I was able to loosen the left end nut.
This front hub shaft is
a brand new part, and despite not normally being a consumable,
it's been given the dubious distinction of being classified as
a "parts we should keep in stock" at our shop.
Unlike the new Bora version, this comes as three separate components that need assembly,
and the relationship between the shaft and dust cap is a press fit.
When tightening with a 5mm Allen key from both sides,
the left end nut might grip more strongly again.
So first I'll firmly tighten the right end nut and hub shaft.
I'm also applying threadlocker with adhesive-like strength to the threads.
The problem is that when you really torque it down with a 14mm hub wrench,
assembly marks appear on the gripping surface.
I used to align two hub wrenches side by side to tighten,
but I ground down a 14mm wrench to exactly match the width of the gripping surface
and made it a dedicated tool just for this job.
I ground it like you see in the picture above.
Wait, I actually ground the opposite side from what's shown in the image.
Boy, I wasn't paying attention there.
So I was able to tighten the right end nut without leaving any marks.
The rear hub logo was facing the correct direction, so
the front hub, which had its logo facing the wrong way when I received it,
I reassembled it with the shaft oriented the other way so the logo faces the correct direction.
I checked everything and found virtually no problems.
has become smaller than the rear hub.
The reason I'm mentioning the wheel model year right at the start is
because something happened.
When the customer tried to grease the hub,
the right end nut came off first, and when they grabbed the right end of the shaft
they stripped it.
When I inserted a 5mm Allen key from both sides,
the right side loosened first as well.
Since the customer approved replacing the hub shaft,
there's a rough method to remove it, so
I was able to loosen the left end nut.
This front hub shaft is
a brand new part, and despite not normally being a consumable,
it's been given the dubious distinction of being classified as
a "parts we should keep in stock" at our shop.
Unlike the new Bora version, this comes as three separate components that need assembly,
and the relationship between the shaft and dust cap is a press fit.
When tightening with a 5mm Allen key from both sides,
the left end nut might grip more strongly again.
So first I'll firmly tighten the right end nut and hub shaft.
I'm also applying threadlocker with adhesive-like strength to the threads.
The problem is that when you really torque it down with a 14mm hub wrench,
assembly marks appear on the gripping surface.
I used to align two hub wrenches side by side to tighten,
but I ground down a 14mm wrench to exactly match the width of the gripping surface
and made it a dedicated tool just for this job.
I ground it like you see in the picture above.
Wait, I actually ground the opposite side from what's shown in the image.
Boy, I wasn't paying attention there.
So I was able to tighten the right end nut without leaving any marks.
The rear hub logo was facing the correct direction, so
the front hub, which had its logo facing the wrong way when I received it,
I reassembled it with the shaft oriented the other way so the logo faces the correct direction.
I checked everything and found virtually no problems.