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Author Topic: Valve stem question for BUB / AMA  (Read 3769 times)
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Cole222
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« on: August 06, 2008, 08:24:55 PM »

My rims have angled metal valve stems that are welded in place. With this in mind how would the following rule apply?

"Angled valve stems must be safety wired to resist centrifugal force deflection."



* Rim_Valve_001_Small.jpg (28.93 KB, 640x480 - viewed 251 times.)

* Rim_Valve_002_Small.jpg (36.92 KB, 640x480 - viewed 240 times.)
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ol38y
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« Reply #1 on: August 06, 2008, 10:24:04 PM »

You might want to send Drew an email. He is the AMA Tech steward that I know of.

 Drew (AMA Tech)
drewsmcserv@verizon.net 

Larry
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Larry Cason
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Dean Los Angeles
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« Reply #2 on: August 07, 2008, 12:37:24 AM »

Experience has shown that the centrifugal force at high speed is going to break that off. You will have to tie it back to the nearest spoke. Yeah, ugly, but necessary.
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« Reply #3 on: August 07, 2008, 12:46:13 AM »

I have a non related question..what bike are those rims from..?

J
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Cole222
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« Reply #4 on: August 07, 2008, 05:58:34 AM »

Thanks for the input. I will email Drew for input.
The bike is a Triumph TT600 MPS-BG.
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maj
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« Reply #5 on: August 07, 2008, 05:47:59 PM »

Now that will be interesting  smiley
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Cole222
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« Reply #6 on: August 11, 2008, 04:50:37 PM »

I spoke with Drew and he was extremely helpful in clarifying a few questions. As to the angled valve stem he indicates that I will be ok since it is one peice coming through the rim and is welded. The rule being originally designed for spoked rims and rims with a rubber seal and nut holding the valve in place. I am looking into cutting them off and replacing with straight stems though for my own peace of mind.
Cole
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