A customer brought in the rear wheel from a レーシングゼロカーボン (Racing Zero Carbon) wheel for repairs.
There's a broken spoke caused by chain drop, but
the spoke fracture didn't happen right after the chain dropped—
it happened a bit later.
It seems the rider pedaled quite hard when the chain dropped,
and normally in mild cases only the outer spokes (the ones on the Yamaarashi direction) would deform,
but the inner spokes also show deformation here.
Also, since the phase of the broken spoke is roughly opposite to the other side,
I can tell the spoke deformation extends all the way around the wheel.
Not only were there broken spokes, but
there were quite a few spokes deformed to the point of needing replacement.
It's fixed.
Out of 14 spokes on the freewheel side, I've taped up 11 of them,
but only replaced 9.
The other 2 locations I'd ideally like to tighten for truing purposes,
but rust in the spoke nipple pocket and thread-locking compound would be pushed in,
so if I forcibly turned the nipples (in the tightening direction)
the spokes might deform or worst case break, so I decided
to loosen them completely for now.
↑replaced spokes
The spoke that's fifth from the top in the image is almost perfectly straight, but
the gouge from the chain drop is quite deep, so it needed replacement.
There's a broken spoke caused by chain drop, but
the spoke fracture didn't happen right after the chain dropped—
it happened a bit later.
It seems the rider pedaled quite hard when the chain dropped,
and normally in mild cases only the outer spokes (the ones on the Yamaarashi direction) would deform,
but the inner spokes also show deformation here.
Also, since the phase of the broken spoke is roughly opposite to the other side,
I can tell the spoke deformation extends all the way around the wheel.
Not only were there broken spokes, but
there were quite a few spokes deformed to the point of needing replacement.
It's fixed.
Out of 14 spokes on the freewheel side, I've taped up 11 of them,
but only replaced 9.
The other 2 locations I'd ideally like to tighten for truing purposes,
but rust in the spoke nipple pocket and thread-locking compound would be pushed in,
so if I forcibly turned the nipples (in the tightening direction)
the spokes might deform or worst case break, so I decided
to loosen them completely for now.
↑replaced spokes
The spoke that's fifth from the top in the image is almost perfectly straight, but
the gouge from the chain drop is quite deep, so it needed replacement.