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 02-29-08, 03:56 PM   #1
bagster
Senior Member
Thread Starter
 
Join Date: Aug 2006
Bikes: cannondale f600 mongoose crossway 850
Posts: 77
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Freewheel Wobble

The LBS just shippped a new rear wheel and Shimano Mf Hg37 7-speed freewheel for my '87 Gt mt. bike.
I noticed the freewheel wiggles back and forth visibly while spinning the wheel.
Is this normal? If not, how do I tighten it? I have a grating sound coming from the drive train while
riding and am wondering if this could be it.
bagster is offline   Reply With Quote
Old 02-29-08, 06:04 PM   #2
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)
It is not unusual for a freewheel to wobble. Doesn't hurt anything.
waldowales is offline   Reply With Quote
Old 02-29-08, 07:03 PM   #3
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)
Normal. Assuming it's not actually crossthreaded.
operator is offline   Reply With Quote
Old 02-29-08, 11:27 PM   #4
markjenn
Senior Member
 
Join Date: Aug 2006
Bikes:
Posts: 929
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
I understood that a small wobble was designed into some freehubs for better shifting.

- Mark
markjenn is offline   Reply With Quote
Old 03-01-08, 07:44 AM   #5
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)
Quote:
Originally Posted by markjenn View Post
I understood that a small wobble was designed into some freehubs for better shifting.

- Mark
Without the wobble, it won't freewheel(verb).
DieselDan is offline   Reply With Quote
Old 03-01-08, 08:41 AM   #6
twobikes
Healthy and active
 
twobikes's Avatar
 
Join Date: Mar 2007
Location: Caldwell, Idaho USA
Bikes: mid-60's Dunelt 10-speed, Specialized Allez Sport Tripple, Trek 7.2 FX
Posts: 887
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If it is new, there is no problem. If it has some miles on it, a wobble combined with a clunk might mean the retaining ring is threading itself out and you have play in the bearings. I had this happen a couple of times on one freewheel. Twice it lost its bearing balls and left me stranded. Most freewheels do not have retaining rings that thread themselves out, but it can happen.
twobikes is offline   Reply With Quote
Old 03-01-08, 06:13 PM   #7
WillisB
Do I use too many commas?
 
Join Date: Aug 2006
Location: Central New York
Bikes: Giant Yukon SE
Posts: 621
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Mine wobble. It's normal!
WillisB is offline   Reply With Quote
Old 03-01-08, 06:23 PM   #8
jfmckenna
Tiocfáidh ár Lá
 
jfmckenna's Avatar
 
Join Date: Dec 2003
Location: The edge of b#
Bikes: A whole bunch-a bikes.
Posts: 5,440
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 65 Post(s)
Quote:
Originally Posted by markjenn View Post
I understood that a small wobble was designed into some freehubs for better shifting.

- Mark
I've heard this too and wonder if anyone can confirm it.
jfmckenna is offline   Reply With Quote
Old 03-01-08, 06:41 PM   #9
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)
Quote:
Originally Posted by jfmckenna View Post
I've heard this too and wonder if anyone can confirm it.
Sounds pretty/extremely bogus to me.
operator is offline   Reply With Quote
Old 03-02-08, 12:30 AM   #10
Rowan
Senior Member
 
Join Date: Jun 2003
Bikes:
Posts: 15,206
Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 447 Post(s)
I believe that the wobble comes from the wider tolerances in fit between the ball bearings and the races inside the freewheel. If you disassemble a freewheel, you will find some spacers under the lock ring. These vary in thickness from freewheel to freewheel because of those wide tolerances, and are intended to take up the bearing preload. However, there will continue to be movement or wobble as described as the wheel rotates because in the production line process, it's unlikely that the exact combination of spacers will be fitted. You've got to remember that these days, freewheels are near the bottom of the retail pond... as borne out by their cheap price... and hence fine tolerances aren't a major concern.

You can believe the shifting theory if you wish. I don't think it's correct.

The wobble is nothing to worry about, and is mentioned frequently on this forum by people relatively new to bicycle mechanics.
Rowan 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 06:50 AM.