Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-05-08, 05:38 PM   #1
nahh
on your left.
Thread Starter
 
Join Date: Nov 2007
Location: Blacksburg, VA
Bikes: Scott SUB 30, Backtrax MTB
Posts: 1,802
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
leaving presta valve adapters on valve stem.

searched, but i can't find the exact answer to my question.

my lbs convinced me to leave my valve adapters on my valve stems, which is great. my question, though, is: Can i leave the presta valve unscrewed (as it is when you're filling it) and the adapter over it, or do i have to rescrew the presta valve everytime i put the adapter on to leave it?

thanks, and if that was too confusing i'll clear it up.
nahh is offline   Reply With Quote
Old 08-05-08, 06:08 PM   #2
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You can leave it unscrewed, the adapter neatly covers the top so that the nut cannot be depressed with the adapter in place. At any rate, the adapter adds rotational weight to your wheels at the worst spot.
operator is offline   Reply With Quote
Old 08-05-08, 06:22 PM   #3
nahh
on your left.
Thread Starter
 
Join Date: Nov 2007
Location: Blacksburg, VA
Bikes: Scott SUB 30, Backtrax MTB
Posts: 1,802
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'd think the tube would fail somewhere else or some other way before the stress of the additional rotational weight would cause it to puncture it at the stem, right?
nahh is offline   Reply With Quote
Old 08-05-08, 06:42 PM   #4
waldowales
Old Fogy
 
Join Date: Oct 2006
Location: Murray, Utah
Bikes:
Posts: 1,224
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Please leave them on. I collect them from the trails and roadsides after they fall off!
waldowales is offline   Reply With Quote
Old 08-05-08, 06:50 PM   #5
Feaduin
Senior Member
 
Join Date: Jul 2008
Bikes:
Posts: 79
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The rotational weight won't cause your tubes or rims to fail. It will just adversely effect acceleration and possibly unbalance the wheel at high speed. But in all honesty, and I mean this in the least offensive way possible, if you are the type of rider who uses valve adapters, you probably won't notice the effects of said adapters; I even doubt most pros or serious amateurs would notice that much. So if you find them convenient go ahead and leave them on... they can't weigh more than 5g anyways.
Feaduin is offline   Reply With Quote
Old 08-06-08, 06:56 AM   #6
treebound 
aka: Mike J.
 
treebound's Avatar
 
Join Date: Apr 2005
Location: between Milwaukee and Sheboygan in Wisconsin
Bikes: 1995 Trek 520 is the current primary bike.
Posts: 3,044
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Quote:
Originally Posted by waldowales View Post
Please leave them on. I collect them from the trails and roadsides after they fall off!


This is along the lines of "don't ziptie your SuperFlash blinkies"
treebound is offline   Reply With Quote
Old 08-06-08, 07:12 AM   #7
04jtb
Senior Member
 
04jtb's Avatar
 
Join Date: Mar 2007
Location: West Dorset, UK
Bikes: 1983 Dawes Galaxy, 2006 Raleigh Airlite, 1982 Sun Solo (fixed)
Posts: 908
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Screw the nut back in would be my advice.
__________________
Quote:
Originally Posted by cc700 View Post
i jam my thumbs up and back into the tubes. this way i can point my fingers straight out in front to split the wind and attain an even more aero profile, and the usual fixed gear - zen - connectedness feeling through the drivetrain is multiplied ten fold because my thumbs become one with the tubing.
A group for all Dawes Galaxy owners to give and recieve information about them
http://flickr.com/groups/dawes_galaxy/
04jtb is offline   Reply With Quote
Old 08-06-08, 08:58 AM   #8
anti.team
Senior Member
 
anti.team's Avatar
 
Join Date: Dec 2007
Location: Ballard, WA
Bikes: '98 Kona Kula, '8X Univega Sportour SS, '81 Trek 710
Posts: 150
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by 04jtb View Post
Screw the nut back in would be my advice.
I agree. The adapter might cover it so you can't press it in, but a pebble or other piece of road debris could.
anti.team is offline   Reply With Quote
Old 08-06-08, 09:01 AM   #9
treebound 
aka: Mike J.
 
treebound's Avatar
 
Join Date: Apr 2005
Location: between Milwaukee and Sheboygan in Wisconsin
Bikes: 1995 Trek 520 is the current primary bike.
Posts: 3,044
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Then put a valve cap on it too.
The LBS I'm at has a little jar with free valve caps for people to take if they need/want one, it's an assortment of both Presta and Schrader valve caps. Some customers like the brightly colored ones whenever they see one in there and will exchange a black one for a red one.
treebound is offline   Reply With Quote
Old 08-06-08, 09:47 AM   #10
nahh
on your left.
Thread Starter
 
Join Date: Nov 2007
Location: Blacksburg, VA
Bikes: Scott SUB 30, Backtrax MTB
Posts: 1,802
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thanks for the advice! @treebound: zipties and superflash blinkies were made for each other
i'm gonna screw the nut back in to avoid road gunk from getting in the valve.
nahh is offline   Reply With Quote
Old 08-06-08, 11:11 AM   #11
datlas
Senior Member
 
datlas's Avatar
 
Join Date: Dec 2007
Location: Malvern, PA (20 miles West of Philly)
Bikes: 1986 Alpine (steel road bike), 2009 Ti Habenero, 2013 Specialized Roubaix
Posts: 18,996
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 488 Post(s)
Maybe I don't get it, but why would you use these adaptors anyway? Don't you use a presta pump??
datlas is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:09 AM.