Online forums say over tightened spokes. Are there any other reasons? Could it be the fact that its a 20h low flange hub?
knoeier on
And radial lacing
It_is_me-Stoney on
It could also be stress corrosion cracking, where tension is one element, but not the sole reason for failure. It’s the bane of my winter cycling with aluminium nipples on salted roads.
Spelunka13 on
Maybe not so technical. You banged it on bike rack maybe or hit a branch or rock?
BadFeisty6728 on
over tensioned, judging by the shape of your spoke head, it should have more of an L shape to it
-ImMoral- on
Could be spoke tension, could be absolutely anything else from corrosion to a rock.
JohnDStevenson on
Crap design/manufacturing.
Yes, the radial spokes aren’t helping, but that’s not exactly an unforeseeable use case, and the rim should deform long before there’s enough tension in the spokes to damage the hub.
Saw a lot of this sort of thing in the CNC-machined components craze of the 90s, because cutting a hub shell from a lump of aluminium doesn’t create the grain in the metal necessary to strengthen it.
Of course it’s possible this is just a one-off failure caused by a manufacturing defect. It happens. But the way the missing piece has just broken off suggests the whole thing wasn’t strong enough in the first place.
lrbikeworks on
Some hubs are designed for radial lacing, some are not. Judging by the white powder residue on the spoke and in the hole and the straightening of the J bend, I’d say it’s a combination of age and corrosion plus impact and overtensioning in this case.
drewbaccaAWD on
Many hubs will not get a warranty if laced radially. Whether that hub was designed for it or not is an unknown but the likely reason.
El_Comanche-1 on
That doesn’t looked to be machined but instead it looks like it casted. Which makes things more brittle. Once you involve a scratch and sweat that equals what you have…
PojkenSomDuger on
Mack superlight has failed in the same way in the past. Rip harmony good luck trying to get a replacement.
Liquidwombat on
A combination of the fact that it’s a crappy hub, and that (based based upon your own replies in this thread) you abuse it
itsEroen on
Bike was locked with a u-lock through the wheel and someone ~~tried to steal~~ wanted to move it out of the way?
13 Comments
Online forums say over tightened spokes. Are there any other reasons? Could it be the fact that its a 20h low flange hub?
And radial lacing
It could also be stress corrosion cracking, where tension is one element, but not the sole reason for failure. It’s the bane of my winter cycling with aluminium nipples on salted roads.
Maybe not so technical. You banged it on bike rack maybe or hit a branch or rock?
over tensioned, judging by the shape of your spoke head, it should have more of an L shape to it
Could be spoke tension, could be absolutely anything else from corrosion to a rock.
Crap design/manufacturing.
Yes, the radial spokes aren’t helping, but that’s not exactly an unforeseeable use case, and the rim should deform long before there’s enough tension in the spokes to damage the hub.
Saw a lot of this sort of thing in the CNC-machined components craze of the 90s, because cutting a hub shell from a lump of aluminium doesn’t create the grain in the metal necessary to strengthen it.
Of course it’s possible this is just a one-off failure caused by a manufacturing defect. It happens. But the way the missing piece has just broken off suggests the whole thing wasn’t strong enough in the first place.
Some hubs are designed for radial lacing, some are not. Judging by the white powder residue on the spoke and in the hole and the straightening of the J bend, I’d say it’s a combination of age and corrosion plus impact and overtensioning in this case.
Many hubs will not get a warranty if laced radially. Whether that hub was designed for it or not is an unknown but the likely reason.
That doesn’t looked to be machined but instead it looks like it casted. Which makes things more brittle. Once you involve a scratch and sweat that equals what you have…
Mack superlight has failed in the same way in the past. Rip harmony good luck trying to get a replacement.
A combination of the fact that it’s a crappy hub, and that (based based upon your own replies in this thread) you abuse it
Bike was locked with a u-lock through the wheel and someone ~~tried to steal~~ wanted to move it out of the way?