Re: Failed Zipp T2 Front Track hub pics

"jim beam" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Quoted message said:

http://img6.picsplace.to/img.php?file=img6/24/arghZipp.JPG
http://img4.picsplace.to/img.php?file=img4/27/failedzipp.JPG

looks like another victim of "tension as high as the rim can bear" to me.
were they ever trued or "helped" by a wrench, or were these straight from
factory?

Straight from the factory like that. Never touched them with a spoke wrench
(never had to, that is, until I had to remove 24 spokes from the rim to get
the hub out :-/

Quoted message said:

jim beam said:

Gemma_k said:

For your holiday amusement:

http://img6.picsplace.to/img.php?file=img6/24/arghZipp.JPG
http://img4.picsplace.to/img.php?file=img4/27/failedzipp.JPG

looks like another victim of "tension as high as the rim can bear" to
me. were they ever trued or "helped" by a wrench, or were these
straight from factory?

Funny thing is, according to what I've read on this ng, zipp rims can
bear less than most, which would imply an even weaker than normal hub.
I would tend to think that this failure was not caused by excessively
high spoke tension, but by poor quality hubs.

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

jim beam said:

Gemma_k said:

For your holiday amusement:

http://img6.picsplace.to/img.php?file=img6/24/arghZipp.JPG
http://img4.picsplace.to/img.php?file=img4/27/failedzipp.JPG

looks like another victim of "tension as high as the rim can bear" to
me. were they ever trued or "helped" by a wrench, or were these
straight from factory?

Funny thing is, according to what I've read on this ng, zipp rims can
bear less than most, which would imply an even weaker than normal hub.
I would tend to think that this failure was not caused by excessively
high spoke tension, but by poor quality hubs.

I don't know about that re: the rims - the track rim looks pretty beefy,
weighs in at 460g by my scales. The spokes were quite highly tensioned, no
sign of any of the spoke holes in the rims failing (touch wood!). The spoke
head holes in the hub perhaps are too deep, so the thickness of the flange
is really 'wasted' or overengineered, making a stress raiser across the
spoke holes?

My Suntour Supurbes are still holding up---supurbely - best hubs EVER :-)

Gemma

quote='jim beam'Gemma_k said:

For your holiday amusement:

http://img6.picsplace.to/img.php?file=img6/24/arghZipp.JPG
http://img4.picsplace.to/img.php?file=img4/27/failedzipp.JPG

looks like another victim of "tension as high as the rim can bear" to
me. were they ever trued or "helped" by a wrench, or were these
straight from factory?[/QUOTE]
Flawed hub (and lousy hub design) with radial spoking looks like the cause to me.