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Presta valve tube question

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Presta valve tube question

Old 06-29-08, 08:30 AM
  #1  
kayandallie
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Presta valve tube question

Next dumb question from me: I'm about to replace my Presta type tube. This tube is different from my old tube and has a silver bolt/nut which seems to be screwed right to the tube. Do I take it off and screw it on after I put the tube on my wheel (as in, it gets screwed down to the rim?) That would seem to make sense to me, but I don't know why it's there and there wasn't one on my old one.
Thanks
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Old 06-29-08, 08:42 AM
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MudPie
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You're correct, that nut is installed after you insert the stem thru the rim. That nut is not necessary. On one bike I have them, on another I don't. The nut helps keep the stem in place when you push the pump head onto it, especially if the tube has no air in it. Often, you can push on the tire opposite of the stem when inserting the pump head. If you do use the nut, just install it finger tight.
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Old 06-29-08, 08:51 AM
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alancw3
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you are correct. once you pump the tube/tire up to the proper pressure you will need the re-tighten the bolt. some tubes like michelin do not have a threaded stem and nut. i like the stem and nut the only negative being that the threads wearout my pump compression rubber fitting.
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Old 06-29-08, 09:01 AM
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kayandallie
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Thanks!
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Old 06-29-08, 10:06 AM
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Originally Posted by MudPie View Post
If you do use the nut, just install it finger tight.
That's a biggie!

If you over tighten that nut you can pull the valve stem off of the inner tube. Hard cornering, if the nut is too tight, will cause your tubes to tear at the side of the valve stem. I used to have a delightful Malasian bike mechanic working for me who called them "The work of the devil." I don't use the valve stem nuts on my personal bikes.
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Old 06-29-08, 11:49 AM
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OLDYELLR
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Originally Posted by kayandallie View Post
... a silver bolt/nut which seems to be screwed right to the tube. Do I take it off and screw it on after I put the tube on my wheel
Is it a hex nut and on there real tight, or a knurled nut just screwed on loose? If the former, just leave it. Some tubes were made that way. If the latter, take it off and throw it away. All those nuts do is keep the valve straight if the tube isn't installed properly. Without the nut, you'll see the valve start to lean if the tire loses air. With the nut, you'll tear out the valve.
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Old 06-29-08, 01:13 PM
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Originally Posted by Retro Grouch View Post
I used to have a delightful Malasian bike mechanic working for me who called them "The work of the devil."
Wow, he must've had quite a distaste for those!
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