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


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-29-08, 01:31 AM   #1
NoCash27
bree bree bree
Thread Starter
 
NoCash27's Avatar
 
Join Date: Sep 2008
Location: Bay Area, CA
Bikes:
Posts: 191
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Something is loose on my bike.

I recently got a new cog and lockring put onto my wheel and when I ride, sometimes it feels like its jerking forward. Not the wheel itself, just maybe the cog or something twisting. I got off to look and can't budge it with my fingers or anything. Sometimes when I'm just riding, everything "clicks" forward or it happens when I skid sometimes too.

Any idea what the problem could be?
NoCash27 is offline   Reply With Quote
Old 11-29-08, 01:43 AM   #2
elTwitcho
Live without dead time
 
Join Date: Jun 2008
Location: Toronto
Bikes:
Posts: 2,137
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is the chain binding? What happens when you spin the cranks with the bike off the ground?
elTwitcho is offline   Reply With Quote
Old 11-29-08, 01:54 AM   #3
matt wisconsin
Senior Member
 
Join Date: Jun 2008
Location: Stevens Point/Milwaukee, WI
Bikes:
Posts: 440
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What kind of cranks? My friend has this exact problem because he had a crankset with the chainring mounted permanently on the cranks.
matt wisconsin is offline   Reply With Quote
Old 11-29-08, 02:02 AM   #4
prawza
Senior Member
 
prawza's Avatar
 
Join Date: Apr 2008
Location: Perth, Australia
Bikes: Avanti ventura, Fuga Track Bike
Posts: 298
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
chain too tight perhaps?
prawza is offline   Reply With Quote
Old 11-29-08, 03:11 AM   #5
squintal
Member
 
squintal's Avatar
 
Join Date: Nov 2006
Location: New Haven, CT
Bikes: 1984 Medici Pro strada running fixed, late 90's Cannondale road bike, 1999 Gary Fischer Paragon mountain bike
Posts: 33
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
could be your cog is stripped.
Especially if you've got a cheaper hub, cog or both.

I don't know if you trust your bike shop, but it sounds like a bad installation to me. Have the shop that did the swap take your cog off (while you watch)
If there's any metal shavings or wear on the lockring, cog, or hub the cog is stripped and you'll need a new cog and hub.
squintal is offline   Reply With Quote
Old 11-29-08, 06:10 AM   #6
NoCash27
bree bree bree
Thread Starter
 
NoCash27's Avatar
 
Join Date: Sep 2008
Location: Bay Area, CA
Bikes:
Posts: 191
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'll go check tomorrow about it being stripped, but I've got the stock cranks on The Hour. When I spin the cranks of the ground all goes well.

It really is completely random when it happens though. And kind of scary. I've got dimension hubs.
NoCash27 is offline   Reply With Quote
Old 11-29-08, 02:47 PM   #7
MarkWW
Senior Member
 
Join Date: Jan 2006
Location: LI, NY
Bikes: A little of each
Posts: 457
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Sounds to me like either the cog or the lockring weren't fully tightened on installation. you probably couldn't budge it with your fingers because after each time that it happens, the cog is either binding up against the hub or the lockring, but just not both like it should be. One way to check would be to push down hard on the forward pedal so that it slips forward again and then feel if you can move the lockring. However, as squintal brings up, each time this happens, your threads are more and more likely to strip, so play with it at your own risk (personally, i'd just assume this is the correct diagnosis and not ride that wheel until I could get everything tightened down again). I don't think the hub is stripped yet, though. It might be stripping, but if it was fully stripped, the cranks would just spin without you moving anywhere because there are no threads left on the hub for the cog to engage.
MarkWW 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 08:07 AM.