Bulging around nipples of Zipp 404 carbon fairings

Hello,
I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee

cycledogg wrote:
Hello,
I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee

have you measured the spoke tension? what is it?

On Fri, 27 Feb 2009 20:43:18 -0800, jim beam
wrote:

cycledogg wrote:
Hello,
I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee

have you measured the spoke tension? what is it?


If the rim is cracking, the spoke tension could appear "correct." Wha
happens is the the rim cracks, the spokes loosen, someone tightens
them, then they appear "correct," even though there are problems
coming.

On Feb 27, 7:12*am, cycledogg wrote:
Hello,
*I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee

Zipp rims are very prone to cracking with any tension above about 90
kgf, which isn't very high. On previous rims, that had a metal 'hoop'
that supported the nipples it wasn't a problem but in their zeal to be
lighter, they removed it. Perhaps a trip to Zipp for inspection would
be a good idea.

On Feb 28, 7:36*am, "P. Chisholm" wrote:
On Feb 27, 7:12*am, cycledogg wrote:

Hello,
*I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee

Zipp rims are very prone to cracking with any tension above about 90
kgf, which isn't very high. On previous rims, that had a metal 'hoop'
that supported the nipples it wasn't a problem but in their zeal to be
lighter, they removed it. Perhaps a trip to Zipp for inspection would
be a good idea.

I'm not sure what the tension is. It looks like a trip to the LBS is
needed. Will there be any chance that if the sopke tension is taken
off, then reset, it will correct this issue?
There is some small amount of cracking noticed. Hard to see, but it
IS there.
Cheers,
Rick in Tennessee

cycledogg wrote:
On Feb 28, 7:36�am, "P. Chisholm" wrote:
On Feb 27, 7:12�am, cycledogg wrote:

Hello,
�I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee
Zipp rims are very prone to cracking with any tension above about 90
kgf, which isn't very high. On previous rims, that had a metal 'hoop'
that supported the nipples it wasn't a problem but in their zeal to be
lighter, they removed it. Perhaps a trip to Zipp for inspection would
be a good idea.

I'm not sure what the tension is. It looks like a trip to the LBS is
needed. Will there be any chance that if the sopke tension is taken
off, then reset, it will correct this issue?

nope.


There is some small amount of cracking noticed. Hard to see, but it
IS there.
Cheers,
Rick in Tennessee

sorry dude - you got screwed by whoever sold these to you.

On 1 Mar, 03:19, cycledogg wrote:
On Feb 28, 7:36*am, "P. Chisholm" wrote:

On Feb 27, 7:12*am, cycledogg wrote:

Hello,
*I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee

Zipp rims are very prone to cracking with any tension above about 90
kgf, which isn't very high. On previous rims, that had a metal 'hoop'
that supported the nipples it wasn't a problem but in their zeal to be
lighter, they removed it. Perhaps a trip to Zipp for inspection would
be a good idea.

I'm not sure what the tension is. It looks like a trip to the LBS is
needed. Will there be any chance that if the sopke tension is taken
off, then reset, it will correct this issue?
There is some small amount of cracking noticed. Hard to see, but it
IS there.
Cheers,
Rick in Tennessee

A crack in resin does not sound good. Unless there are recommended
repairs possible for minor cracks, I would be inclined to either scrap
them immediately or test them to destruction at convenience. If not
doing the former, clearly mark the wheels as unsuitable for riding due
to cracking of rim.
TJ

On 28 Feb, 13:36, "P. Chisholm" wrote:
On Feb 27, 7:12*am, cycledogg wrote:

Hello,
*I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee

Zipp rims are very prone to cracking with any tension above about 90
kgf, which isn't very high. On previous rims, that had a metal 'hoop'
that supported the nipples it wasn't a problem but in their zeal to be
lighter, they removed it. Perhaps a trip to Zipp for inspection would
be a good idea.

Manufacturers require feedback to ensure a competent product.
TJ

On Feb 28, 8:19*pm, cycledogg wrote:
On Feb 28, 7:36*am, "P. Chisholm" wrote:

On Feb 27, 7:12*am, cycledogg wrote:

Hello,
*I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee

Zipp rims are very prone to cracking with any tension above about 90
kgf, which isn't very high. On previous rims, that had a metal 'hoop'
that supported the nipples it wasn't a problem but in their zeal to be
lighter, they removed it. Perhaps a trip to Zipp for inspection would
be a good idea.

I'm not sure what the tension is. It looks like a trip to the LBS is
needed. Will there be any chance that if the sopke tension is taken
off, then reset, it will correct this issue?
There is some small amount of cracking noticed. Hard to see, but it
IS there.
Cheers,
Rick in Tennessee

Cracking bad, bulging maybe not, but cracks-bad.

On Feb 28, 8:38*pm, Nick L Plate wrote:
On 28 Feb, 13:36, "P. Chisholm" wrote:

On Feb 27, 7:12*am, cycledogg wrote:

Hello,
*I just picked up a set of used Zipp 404 clinchers and noticed that at
some of the nipples their is a slight bulge. Is this a sign of
weakness in the carbon, overtightened when truing, or is this commonly
seen on this type of rim? Everything else seems structurally ok.
Cheers,
Rick in Tennessee

Zipp rims are very prone to cracking with any tension above about 90
kgf, which isn't very high. On previous rims, that had a metal 'hoop'
that supported the nipples it wasn't a problem but in their zeal to be
lighter, they removed it. Perhaps a trip to Zipp for inspection would
be a good idea.

Manufacturers require feedback to ensure a competent product.
TJ

Like Zipp when they made them lighter and when eyelets pulled out they
said to reduce tension below what was needed to keep the wheel true?
Or FSA when their left arms kept falling off, they sent out some uber-
bonding loctite? Some manufacturers don't want feedback.