Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 31

Thread: Presta Tubes

  1. #1
    Senior Member
    Join Date
    Jul 2009
    Location
    Alberta,Canada.
    Posts
    800
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Presta Tubes

    Its not like i havnt been around cycling alot,but ive never seen this practice before. I was talking to a bike shop mech who tells me its common to not put plastic cap or the little knurled nut on presta tubes on bike. Ive never had troubles with using them although they can be a bit of a pain not to lose in dark with flat.
    Is this a common practice to leave them off?
    Is it ok. to not use them?

  2. #2
    Senior Member
    Join Date
    Dec 2009
    Posts
    263
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I use dust caps on schrader valves and presta valves and I always use the little knurled nut on presta stems (when threads are present).

  3. #3
    Senior Member Nichole's Avatar
    Join Date
    May 2009
    Location
    West Jordan, UT
    My Bikes
    2009 Giant Defy 1
    Posts
    61
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    All the little plastic cap does is act as a dust cap. You won't lose any air without it since the little nut on the stem itself is what keeps the air from escaping when tightened. If your ride is significantly muddy/gritty, then you would simply have to clean the valve before inflating. Otherwise, I wouldn't worry about not having one.
    <3 ><>

    Beware of my perpetual helmet hair.

  4. #4
    Senior Member
    Join Date
    Apr 2006
    Location
    Sioux Falls
    My Bikes
    Bianchi Road bike, Nashbar Ultegra triple cyclocross, Raleigh full XT hybrid, lugged steel Schwinn, Full rigid Diamondback MTB
    Posts
    220
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The dust caps are optional especially if you aren't riding in sloppy conditions. (I leave mine on but also ride through snow, mud etc) I've heard the threaded ring helps keep the tube in place and your more likely to suffer flats without it. I've been too chicken to try the experiment of leaving the ring off so I can't tell you if that's true.

  5. #5
    Senior Member
    Join Date
    Aug 2007
    Location
    Belgium
    Posts
    748
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    The plastic cap on schrader valves is important to keep debris out of the valve stem opening that could interfere with the spring. Schrader valves keep air in by means of a spring actuated valve. Presta valves keep air in by means of the air pressure pushing the valve closed, then the knurled stem of the valve is screwed down as extra insurance. Given the difference in design there is little chance for debris affecting the presta valve. Some cyclists/mechanics omit the cap on presta as taking it off is just one more step that they have to perform before a punctured tube can be replaced. Some might consider using the cap as additional assurance that the stem of the presta valve won't unscrew or to give the wheel that extra "finished look". To answer your question directly, it is perfectly fine to leave them off if you so choose.

    -j

  6. #6
    Quirky Grifter LesterOfPuppets's Avatar
    Join Date
    Sep 2008
    Location
    Vancouver, USA
    My Bikes
    My War
    Posts
    20,001
    Mentioned
    42 Post(s)
    Tagged
    7 Thread(s)
    I used to put the nut on the tubes of my 28-38 mm tires on my old road bike, since I had to deflate the tires every time I removed the wheels, and I did a lot of drive+bike+drive trips in a Toyota Corolla back then. The nut makes inflating a completely deflated tube a little easier.

    Now that I hardly ever deflate tires, I don't put the nut or the cap on.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  7. #7
    Senior Member
    Join Date
    Jul 2009
    Location
    Alberta,Canada.
    Posts
    800
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for answers,i thought possibly the mech was pulling my leg as hes prone to do.
    Last edited by ddez; 02-22-10 at 12:36 PM.

  8. #8
    Quirky Grifter LesterOfPuppets's Avatar
    Join Date
    Sep 2008
    Location
    Vancouver, USA
    My Bikes
    My War
    Posts
    20,001
    Mentioned
    42 Post(s)
    Tagged
    7 Thread(s)
    The tube should only move around if you run fairly low pressures.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  9. #9
    Senior Member jack002's Avatar
    Join Date
    Feb 2009
    Location
    Southwest MO
    My Bikes
    (1) 1993 Cannondale R900, red
    Posts
    594
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ddez View Post
    Its not like i havnt been around cycling alot,but ive never seen this practice before. I was talking to a bike shop mech who tells me its common to not put plastic cap or the little knurled nut on presta tubes on bike. Ive never had troubles with using them although they can be a bit of a pain not to lose in dark with flat.
    Is this a common practice to leave them off?
    Is it ok. to not use them?
    Yeah, I don't use either one. The Cap, just because the valve screws down and theres no place for dirt to get into them, and the ring, if you tighten them too much the valve comes out of the tube, I had it happen like 3x this last summer, the LBS mech said you don't even need them, so I don't use them to try to keep the tubes intact.
    Biking isn't a sport because anybody can do it. I can bike, you can bike. For goodness sakes, my mother can bike! You don't see her on the cover of Sports Illustrated, do you?

  10. #10
    Spinning @ 33 RPM Glynis27's Avatar
    Join Date
    Aug 2007
    Location
    NE Ohio
    My Bikes
    '89 Fuji Saratoga, '97 Schwinn Mesa SS, '07 Felt F1X, '10 Transition TransAM, '11 Soma Analog SS
    Posts
    746
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I don't use the caps, but I do use the knurled nut. It makes it easier to inflate, especially with a mini pump. I left it off once, and the valve would move around and make a ticking noise with every rotation. Put the nut back on, no more problems.
    1989 Fuji Saratoga
    1997 Schwinn Mesa SS
    2007 Felt F1X
    2008 Transition Vagrant SOLD!
    2010 Transition TransAM
    2011 Soma Analog SS

  11. #11
    Gears? CliftonGK1's Avatar
    Join Date
    Jul 2006
    Location
    Philadelphia, PA
    My Bikes
    '08 Surly Cross-Check, 2011 Redline Conquest Pro, 2012 Spesh FSR Comp EVO, 2009 Spesh Singlecross, 2011 RM Flow1
    Posts
    11,322
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Glynis27 View Post
    I don't use the caps, but I do use the knurled nut. It makes it easier to inflate, especially with a mini pump.
    +1
    I keep a knurled nut on the tube in my flat repair gear for just this reason. It's easier with the tight fitting heads on most mini pumps to just use the nut when doing a roadside repair.
    "I feel like my world was classier before I found cyclocross."
    - Mandi M.

  12. #12
    Senior Member CACycling's Avatar
    Join Date
    Feb 2008
    Location
    Oxnard, CA
    My Bikes
    '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX
    Posts
    4,439
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've never used the rings (and never had a problem because of it) but always use the caps (although I can't see why leaving them off would hurt).

  13. #13
    Hello zebede's Avatar
    Join Date
    Aug 2007
    Location
    Suncoast, Florida
    My Bikes
    BF Tikit, Dahon Speed TR, Mezzo I4
    Posts
    520
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    The bike would be NAKED without the little knurled nut and a valve cap.

    I wouldn't let a bike go outside.

  14. #14
    Senior Member mkane77g's Avatar
    Join Date
    Apr 2009
    Posts
    675
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My stems are smooth so no nut, and no cap. While using a pump, wrap thumb over the top of the tire to stabilize and have at it.

  15. #15
    Senior Member BCRider's Avatar
    Join Date
    Mar 2008
    Location
    The 'Wack, BC, Canada
    My Bikes
    Norco (2), Miyata, Canondale, Soma, Redline
    Posts
    5,429
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You've hit on a topic that is almost as religious in nature as what to lube the chain with

    I use them semi fanatically because I don't want a bit of grit sitting on the stem thimble to get blown into the valve and possibly cause a slow leak through the valve. Granted the end of the valve is no where near as exposed as the open cup of a schreader stem but I figure why take chances. On the other hand if I lose the cap during a trialside flat repair it's hardly the end of the world and I don't keep a half dozen spares in my repair kit.

    But during a thread we had about this exact same topic roughly a year back a lot of folks said that they served NO purpose at all other than protecting the tube while in the box, that anyone using them likely has dork discs as well and that generally their IQ was lower than a snake's belly in a wagon rut for figuring they were worthwhile.

    Oddly enough having had a chain eat an entire back wheel on one occasion when it slipped down between the big cog and the spokes I proudly run dork discs on all my bikes. I guess that pretty much answers those folk's opinion of me..... Geez, the sides of this rut sure are high....
    Last edited by BCRider; 02-23-10 at 08:26 PM.
    Model airplanes are cool too!.....

  16. #16
    STFD mcgreivey's Avatar
    Join Date
    Jul 2008
    Location
    North Bergen, NJ
    My Bikes
    '80 Windsor Carrera Sport, '02 Specialized Sirrus A1, '10 Giant Escape 2
    Posts
    778
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I use the cap because I see no reason not to, and because more than once it's happened that when I've left it off, I've cut my finger on the metal flashing that's on the tip of the stem. But perhaps I'm more of an absent-minded clod than most.

  17. #17
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    12,450
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    If the couple extra grams using the caps is an insufferable burden for you, by all means leave them off. I leave them on because the extra mass means I'm training that much harder than the next guy.


  18. #18
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    20,513
    Mentioned
    45 Post(s)
    Tagged
    1 Thread(s)
    Possibly the practice of not using the cap or rim nut goes back to the days of tubular tires. With tubulars, I never want anything that could trap the valve in the rim if I were to roll a tire. It could be the difference between riding a rim (and probably destroying it) and a locked wheel causing a more serious crash.

    It's a habit that sticks with you, so today, even on my PV mtn bike tires, where it doesn't matter either way, I still don't use the cap or ring. As far as I'm concerned the only purpose of the valve cap on PV tubes is to protect the tube from puncture while it's still a rolled up spare.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  19. #19
    Senior Member
    Join Date
    Dec 2009
    My Bikes
    late 80's bianchi campion d'italia, early 90's trek 2100, early 90's shogun selectra, mid 90's aluminum marin xcMTB, dept. store grade but upgraded columbia double eagle tandem
    Posts
    437
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My Old Bianchi came with mismatched valve stems (one for a deep V wheel one not), but both with Red valve caps. I continue this tradition and transfer them from tube to tube because they look bada$$.
    All You Haters Suck My Pawls.

  20. #20
    Old Fogy
    Join Date
    Oct 2006
    Location
    Murray, Utah
    Posts
    1,224
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It's a difficult decision, leave off the caps and save all that weight, or put them on for the streamlining effect, by covering up the drag-inducing pin and nut.

  21. #21
    Senior Member
    Join Date
    Sep 2009
    Posts
    588
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by JohnDThompson View Post
    If the couple extra grams using the caps is an insufferable burden for you, by all means leave them off. I leave them on because the extra mass means I'm training that much harder than the next guy.

    then you can take them off and drop everybody

    for some reason, my bike has the knurled nut on one tire and it doesn't have it on the other. I haven't had to change the tubes or tires yet, so I couldn't have lost it, the LBS must have only put on one as some kind of sick joke.

    But I haven't had any problems with either wheel, I'd say the nut doesn't do anything. But I can see how it could be useful when using a pump.

  22. #22
    Senior Member vredstein's Avatar
    Join Date
    Aug 2008
    Location
    Tucson, Arizona
    My Bikes
    '02 Lemond Buenos Aires, '98 Fuji Touring w/ Shimano Nexus premium, '06 Jamis Nova 853 cross frame set up as commuter, '03 Fuji Roubaix Pro 853 back up training bike
    Posts
    701
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by BCRider View Post
    a lot of folks said that they served NO purpose at all other than protecting the tube while in the box,
    It also protects the small valve which is prone to getting bent if anything hits it.
    "See, it's not that getting wet is a big deal. Really, it's what you're getting wet with.
    Fenders....because it's probably urine."
    Bike Snob NYC

  23. #23
    Quirky Grifter LesterOfPuppets's Avatar
    Join Date
    Sep 2008
    Location
    Vancouver, USA
    My Bikes
    My War
    Posts
    20,001
    Mentioned
    42 Post(s)
    Tagged
    7 Thread(s)
    Once I had a dude on the train point out that my nut was loose. That might have been the impetus for me no longer using the nuts.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  24. #24
    bike whisperer Kimmo's Avatar
    Join Date
    Dec 2009
    Location
    Melbourne, Oz
    My Bikes
    copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
    Posts
    6,828
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by BCRider View Post
    But during a thread we had about this exact same topic roughly a year back a lot of folks said that they served NO purpose at all other than protecting the tube while in the box, that anyone using them likely has dork discs as well and that generally their IQ was lower than a snake's belly in a wagon rut for figuring they were worthwhile.
    LOL... I'd be in that camp.

    If it's not necessary, it doesn't go on my bike.

    Mind you, I did use the nuts on my old early 70s classic to hide the fact some dickhead had drilled out one of the rims to fit a shrader valve... they kind of added to period look, too.

  25. #25
    Quirky Grifter LesterOfPuppets's Avatar
    Join Date
    Sep 2008
    Location
    Vancouver, USA
    My Bikes
    My War
    Posts
    20,001
    Mentioned
    42 Post(s)
    Tagged
    7 Thread(s)
    Hehehe! I drilled out a couple of my rims back in the day in preparation for a tour. Figured I had to be ready for anything.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •