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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 12-21-06, 01:36 AM   #1
G0balistik
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Disc Wheel Modification? PIC

So I just got a new tubular in the mail from nashbar, and I set it up on my disc wheel to stretch it out and I noticed that the valve is too long. It goes past the middle of the hole cut out for the pump, so it is a real hassle to get the pump head in there. Even then I can only inflate it to about 80psi, because the seal isnt good. And yes I have a hasg pipe on my pump so I can inflate disc wheels.

My question is; is it safe to cut out a few mm of material to make the hole larger? Will that destroy the wheel? I know I can go buy another tubular but, then I will always have this useless one lying around.

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Old 12-21-06, 01:48 AM   #2
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because that hole your looking at looks so professionally done.
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Old 12-21-06, 01:56 AM   #3
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Doesn't look too clean, but evidently good enough for the fastest bike in the world (link)
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Old 12-21-06, 02:00 AM   #4
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Yup its fine if you know how to do it. Our shop manager did the same exact thing for a word class triathlete just 3 weeks ago.
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Old 12-21-06, 03:27 AM   #5
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Is there a special way to do it? or recomended tools? i Just figured I would try an exacto and work slow.
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Old 12-21-06, 03:29 AM   #6
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Dremel?
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Old 12-21-06, 06:43 AM   #7
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Quote:
Originally Posted by Nouia


Doesn't look too clean, but evidently good enough for the fastest bike in the world (link)
That looks like it was made in 0.01 sec with a shotgun.
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Old 12-21-06, 08:16 AM   #8
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I've never done this exact job before, but I would probably use a small die grinder, or a grinding head on a dremel tool. Move the tool back and forth across the bottom of the hole in slow even motions keeping light pressure, and you'll come out with a pretty clean looking elongation.
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Old 12-21-06, 11:13 AM   #9
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dremel tool cutting disk. cover any fiber burrs with clear nailpolish.
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Old 12-21-06, 11:25 AM   #10
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Buck shot would take out the whole wheel. Probably a 357.
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Old 12-21-06, 12:38 PM   #11
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dremel tool, fine toothed cutting disc, latex gloves and a dust-mask [skin doesn't like carbon fibres, and silicosis sucks a bit more than itchy skin].

after you've finished cutting, run some cyano/superglue along the cut edge to seal everything back up.

fsnl
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Old 12-21-06, 01:08 PM   #12
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be aware that you will have to remove extra material to give clearance for the pump "pipe" to inflate the tire.
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