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PostPosted: Fri Mar 29, 2013 7:40 pm 
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Joined: Wed Jul 16, 2008 10:37 am
Posts: 253
I've just had a front wheel built with this rim (updated version), on the first ride I felt excessive pulsing of the brake, on inspection there is a noticeable bulge on one side of the brake track, it starts exactly at the welded joint and is 70mm long, measuring the width of the rim at this point with a micrometer shows it's 21.6mm (+1.35mm) wide compared to 20.25 for the rest of the rim.
This bulge appears only when the tire is on and fully inflated (95psi) and it disappears when deflated!
Image


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Posted: Fri Mar 29, 2013 7:40 pm 


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PostPosted: Fri Mar 29, 2013 7:44 pm 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 2196
Location: Santa Cruz, California, USA
Scary! 1.35mm is a lot. I've found that anything over .25-.30mm causes noticable pulsing. Sometimes even less.


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PostPosted: Fri Mar 29, 2013 8:04 pm 
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Joined: Tue Feb 05, 2013 8:29 pm
Posts: 236
Warranty those rims ASAP.


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PostPosted: Fri Mar 29, 2013 8:59 pm 
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Joined: Wed Oct 31, 2007 10:32 pm
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Location: Los Angeles / Glendale, California
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Exp001 || Other projects in the works.


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PostPosted: Fri Mar 29, 2013 9:17 pm 
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Joined: Wed Jun 01, 2011 7:53 am
Posts: 678
Is this an older 340? I have thre pairs of these and on the first pair it seems the rims were really thin. I had some malformation around the nipple holes over time after retensioning a few times. They just seem to be pretty thin and fragile rims. I think that's why they came out with the 400 honestly.

Weird to see a bulge at the brake track thopugh...


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PostPosted: Fri Mar 29, 2013 10:04 pm 
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Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1606
Location: Welland, Ontario
That's not rideable.

My experience with the early version of these rims was related to poor joint quality. Looks like you have a different quality problem.

Considering the price they were pretty disappointing.

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PostPosted: Fri Mar 29, 2013 10:10 pm 
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Joined: Mon Apr 03, 2006 8:53 am
Posts: 646
bikerjulio, I agree.

I had two that pulsed 1st gen, will not use then again.

C


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PostPosted: Fri Mar 29, 2013 10:20 pm 
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Joined: Sun May 16, 2010 7:28 pm
Posts: 872
I crashed on monday going down a descent because a rock bent the bead of my rim inwards knocked the entire wheel out of true. It was clear that there was bulging at other spots on the rim where the uneven spoke tension had pulled the rim material out of the way. I would not ride that rim. V1 340 rims btw.


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PostPosted: Fri Mar 29, 2013 10:55 pm 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 2196
Location: Santa Cruz, California, USA
Aiee! I'll ride chinese carbon down a 55 mph descent with no concern but I wouldn't use that rim.

Part of me wants to tell you to pump the tire up to 140 psi to see what happens. But only if you have a safety cage to put it in. The rest of me says to let the air out right now, keeping your face as far away from the rim as possible.


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PostPosted: Sat Mar 30, 2013 5:59 am 
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Joined: Wed Jul 16, 2008 10:37 am
Posts: 253
This is the updated (heaver) version, pulled the tire off and the rim has a crack in the corner of the bead seat
starting at the welded joint and running along it for a couple of inches or so, I can flex it open with a bit of finger pressure quite easily,
the joint is poorly finished inside and out and theres quite a noticeable step at the joint inside.
If I pumped it up to 140psi I think it would open up like a sardine can.
Image
sorry don't know whats up with the pics


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PostPosted: Sat Mar 30, 2013 6:02 am 
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Location: Los Angeles / Glendale, California
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Posted: Sat Mar 30, 2013 6:02 am 


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PostPosted: Sun Mar 31, 2013 2:26 am 
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Joined: Sat Mar 05, 2011 6:01 am
Posts: 35
Location: SF Bay Area
I have a set of custom wheels built on older Stans 340 rims. Even though they are older version rims, the wheels have very low miles. On the rear wheel, while I was cleaing the rim yesterday, I noticed hairline cracks around at least 4 nipple holes. I have read many postings on the net about this cracking issue. Has Stans ever taken responsibility for what seems like a faulty product? If not, why not?


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