"X Airfoil" rims?

We were heading out on a 65 mile ride earlier this week and I set my
tire to 35PSI. I have the TA and a 36" stock tube on my airfoil rim
with the "X". 8 miles into it it blew off...bad times. I've never
known anything to be that intolerant that close to its limit. I
suppose it is over, but seriously...3PSI??

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mouse
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mouse said:

...but seriously...35PSI??

corrected

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skilewis74
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skilewis74 said:

corrected

3 psi over the 32 recommended. I want to upgrade my stock wheel, but
it just doesn't feel right with less than 50 psi.

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boo radley

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I ride mine at 50PSI and would be very dissappointed were I not be able
to. Mine is not an "X". There are other threads on this. I think this
rim may be a problem.

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pdc

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pdc said:

I think this rim may be a problem.

Yes, the rim is a problem.

<start broken record mini-rant> But the other problem is UDC's
unwillingness to flex a little "buyer muscle" and reject those things
for the [censored] that they are. I don't think they'd even have that
disclaimer had I not raised the issue when ordering my son's X-mas
Nimbus.

If the current supplier--whom they won't disclose--isn't up to the task
of delivering quality product, then the world's largest distributor of
unicycling equipment should step up and source an alternative. <end
broken record mini-rant>

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tomblackwood

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They said in an email that they aren't even going to look at buying new
stock or finding a new supplier until all of the current ones are sold
which is upsetting because I really want to get a coker for this summer
but I refuse to do so until the rim issue is fixed. I don't want the
steel rim.

"We won’t have any more airfoil 36 rims for a long time. Since
the mess-up, we are looking for a new rim-maker. We have no set date on
new airfoils, we just know we won’t be looking for any till the
ones we have are sold."

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Brian O. said:

They said in an email that they aren't even going to look at buying new
stock or finding a new supplier until all of the current ones are sold
which is upsetting because I really want to get a coker for this summer
but I refuse to do so until the rim issue is fixed. I don't want the
steel rim.

I would disagree. In fact, I think that everyone who has a steel
rimmed Coker or who would like a coker should buy an Airfoil rim.

As far as I see it, the sooner people start buying the [censored] small
Airfoil rim that has a track record of failure, the sooner the stocks
will run out. And the sooner the stock is used up, the sooner they
will make more rims which should be back up to normal spec. And the
sooner the new rims are available, the sooner I can buy a decent rim
myslef.

Well, ok, I admit that maybe I'm being a little selfish here. I would
appologise but it would only come across as incincere 😄

STM

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semach.the.monkey
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ok guys i still havent found an answer out.

how do i tell if i have the x rim or not?

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iridemymuni said:

ok guys i still havent found an answer out.

how do i tell if i have the x rim or not?

ha, I was just chuckling to myself about that. If I knew, I'd tell ya.
If you have to resort to calling UDC, please let us know the answer.

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iridemymuni said:

ok guys i still havent found an answer out.

how do i tell if i have the x rim or not?

Measure the diameter and I will measure mine..

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the best measurement i could get was exactly 800mm, how about you?

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800mm, take or give a mm but not much difference, and I have the old
batch..

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hmm.

well it looks like i might have the non-x version then. that's good to
hear.

do we know how much smaller the x rims are, like 1-2mm or like a
whopping 5-6mm?

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To measure it correctly you'd need to remove all the spokes and hub so I
guess it's not the best way to do it.. for now I wouldn't be too
worried, if it's only 1 or 2mm then I don't see you have much trouble
with it, I think UDC Australia would have the old rims in stock seeing
as they probably dont sell many. Why don't you ask UDC to make sure?

--
DustinSchaap

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I'm not positive that this is correct, but I measured our steel rim and
our X airfoil. The steel rim was 807mm and the airfoil was 803mm.
very slight difference, but I suppose it matters. Further into my rim
saga, I replaced the tube with a 29" right after the issue and threw
the tire back on at 32PSI....the tire popped out but there was no
blowout this time about the same distance later...The tire bead is
completely intact and not damaged so I'm not sure what gives. The bike
shop looked over it and said the bead was in good shape but very slight
in general. They said they put tubular tire bead adhesive on it and
put it back on with my spare 36" tube. Its been sitting at 20PSI in
the dorm room for a day now just because I've been too edgy to ride it.
I'll inflate it and give it a go today on some dead back roads where a
potential blow out will not be dangerous. I'll update when I get back.

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A fine point: for evaluating the rim's compatibility, make a visual
inspection of where the bead valley is on the inside of the rim wall.
It's not enough to just measure the overall diameter of the rim, it's
really where the rim bead valley is located.

A course point: when you mount any tire, it has to be centered on the
rim. It is possible to have one section of the tire bead mounted
outside of the rim's bead valley. A blowout waiting to happen. JC has
made this observation many times before in various threads. Important
enough to save your ride.

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hey thanks for pointing out the different size/shape of the inner parts
of the rim that hold the bead. Makes sense that those would also be
different and make a difference in the two designs. It seems like my
tire is holding properly now and I inflated it back to 32PSI/rode a
short 10 mile day yesterday without problems. Hopefully this thursday
will bring a 65mile long ride writeup with it and lack stories of
destroyed 36" tubes :p

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unisk8r said:

A fine point: for evaluating the rim's compatibility, make a visual
inspection of where the bead valley is on the inside of the rim wall.
It's not enough to just measure the overall diameter of the rim, it's
really where the rim bead valley is located.

I concur, I have one of the 'x' rims and it is obvious without
measurement that the tyre does not sit in it as deeply as it should.
Also standing the steel and airfoil rims next to each other the steel
is approx. 5mm larger in diametre.

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kington99

Dave

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I would send it back. It's defective (more so than the other "X" rims)

I recently purchased a wheel (airfoil+wheelTA) from uni.com, and I've
been running it at 45 psi with no problems. 32 is just too low for road
riding.

mouse said:

hey thanks for pointing out the different size/shape of the inner parts
of the rim that hold the bead. Makes sense that those would also be
different and make a difference in the two designs. It seems like my
tire is holding properly now and I inflated it back to 32PSI/rode a
short 10 mile day yesterday without problems. Hopefully this thursday
will bring a 65mile long ride writeup with it and lack stories of
destroyed 36" tubes :p

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