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 04-30-07, 09:27 PM   #1
registered usar
Senior Member
Thread Starter
 
Join Date: Apr 2007
Bikes:
Posts: 185
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What causes that locking screw on the wheel hub to get loose

i bought a bike that was a little rough but was very cheap because of this. one of the first things i noticed was play in the front wheel. I didn't know what it was. At first I thought the quick release wasn't tight enough. But after inspecting it i saw the hub screw was loose. so i took off the wheel and removed that small plastic cap that meshes with the locknut and tightened it. That did the trick. I'm just wonder what would cause that screw to come loose? This was a mountain bike. Is that something that loosens normally oiver time? It was only a 2006 bike.
registered usar is offline   Reply With Quote
Old 04-30-07, 09:48 PM   #2
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Bikes: Some silver ones, a black one, a red one, an orange one and a couple of titanium ones
Posts: 17,832
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 82 Post(s)
Quote:
Originally Posted by registered usar
i bought a bike that was a little rough but was very cheap because of this. one of the first things i noticed was play in the front wheel. I didn't know what it was. At first I thought the quick release wasn't tight enough. But after inspecting it i saw the hub screw was loose. so i took off the wheel and removed that small plastic cap that meshes with the locknut and tightened it. That did the trick. I'm just wonder what would cause that screw to come loose? This was a mountain bike. Is that something that loosens normally oiver time? It was only a 2006 bike.
Go over to Park Tools for more details. The cone system of a hub consists of a cone which engages the bearings and provides the surface for them to run on, usually a spacer and a nut. There should be nuts on both sides. The nut should be jammed against the spacer to hold the cone in place. Often the jam nut isn't tightened against the cone sufficiently and can back out (friction will do that). What I do is to adjust the bearings so that they are just a little too tight with the cones (a little!) and then hold one cone still with a cone wrench and hold the jam nut on the same side still with another wrench. I then turn the cone counter clockwise against the jam nut with a fair amount of force. You should end up with bearings that have a little play in them and the cone should be locked in place. The play in the bearings is taken up by the quick release.
__________________
Stuart Black
New! Pokin' around the Poconos A cold ride around Lake Erie
New! Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
An Good Ol' Fashion Appalachian Butt Whoopin'.
cyccommute is offline   Reply With Quote
Old 05-01-07, 12:18 AM   #3
z415
Senior Member
 
z415's Avatar
 
Join Date: Apr 2006
Location: Gainesville/Tampa, FL
Bikes: Trek 1000, two mtbs and working on a fixie for commuting.
Posts: 2,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sometimes it just happens. Hubs are very picky, IMO, and I have usually have a hard time minimizing bearing play, maximizing bearing smoothness, and locking those darn things in. Incidentally I overhaul my hub once once every other month, just when they get loose.
z415 is offline   Reply With Quote
Old 05-01-07, 09:31 AM   #4
DieselDan
Senior Member
 
DieselDan's Avatar
 
Join Date: Mar 2003
Location: Beaufort, South Carolina, USA and surrounding islands.
Bikes: Cannondale R500, Motobecane Messenger
Posts: 8,521
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
More then likely it came loose when someone removed the wheel to change a flat. Cones and locknuts can lose adjustment if not properly tightened.
DieselDan 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 06:52 AM.