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 05-31-10, 04:49 PM   #1
egraetze
Junior Member
Thread Starter
 
Join Date: May 2010
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Fixed gear removal - Motobecane Fantom Uno

I bought a Fantom Uno several weeks ago new. It has a flip flop hub. I've wanted to put a smaller sprocket on the fixed side. I've removed the locking ring, but can't get the sprocket to budge at all. I've pulled on my chainwhip tool as hard as I can. I've tried to force the cranks with my front wheel against the wall, and nothing happens. When I first bought the bike, I could feel the sprocket seating in the backward pedal direction. Any suggestions for breaking this free?
egraetze is offline   Reply With Quote
Old 05-31-10, 04:55 PM   #2
xkillemallx16
Senior Member
 
Join Date: Sep 2009
Location: im, hungary
Bikes:
Posts: 1,976
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Lbs.
xkillemallx16 is offline   Reply With Quote
Old 05-31-10, 05:02 PM   #3
j3ffr3y
chickenosaurus
 
j3ffr3y's Avatar
 
Join Date: Sep 2008
Location: Boston, MA
Bikes: 2010 Motobecane Team Track, 1997 GT Edge, 2012 Kilo TT Stripper
Posts: 1,189
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by xkillemallx16 View Post
Lbs.
reverse rotafix
http://204.73.203.34/fisso/eng/schpignone.htm
j3ffr3y is offline   Reply With Quote
Old 05-31-10, 05:44 PM   #4
WoundedKnee
Antarctica awaits
 
WoundedKnee's Avatar
 
Join Date: Jun 2009
Location: Tucson, Zona
Bikes:
Posts: 1,965
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by j3ffr3y View Post
This.
WoundedKnee is offline   Reply With Quote
Old 05-31-10, 06:03 PM   #5
Scrodzilla
There goes Tokyo
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: San Diego, CA
Bikes: EAI Bare Knuckle, 1975 Raleigh Pro Track
Posts: 25,331
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 217 Post(s)
Yup.
__________________
Scrodzilla is offline   Reply With Quote
Old 05-31-10, 06:26 PM   #6
Roland Owens
Senior Member
 
Join Date: Mar 2007
Location: Massanutten, VA
Bikes:
Posts: 111
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
So when I got my Motobecane Messenger the cog was on there with red loctite. Took a torch to heat it up to get it loose.

Roland
Roland Owens is offline   Reply With Quote
Old 06-01-10, 05:59 AM   #7
egraetze
Junior Member
Thread Starter
 
Join Date: May 2010
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Roland Owens View Post
So when I got my Motobecane Messenger the cog was on there with red loctite. Took a torch to heat it up to get it loose.

Roland
I could feel the cog move when braking with the pedals, and there is no evidence of locktite. The lockring came off easy too. I will have to give this method a try tonight. Thanks for the advice.
egraetze is offline   Reply With Quote
Old 06-01-10, 06:11 AM   #8
f50fan
Senior Member
 
Join Date: May 2008
Bikes:
Posts: 174
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What? No! dont need a blow torch!
You werent really going to try that were you?

As others said, try reverse rotafix. If that doesnt do it, then use a torch. Reverse rotafix will give the most torque using a simple method.
f50fan is offline   Reply With Quote
Old 06-01-10, 06:15 AM   #9
norskagent
car dodger
 
norskagent's Avatar
 
Join Date: Aug 2005
Location: garner/raleigh nc
Bikes:
Posts: 3,365
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've had luck using the dubious method of wrapping the chain whip so the cog is fully engaged, then carefully stomping on the chain whip handle. I don't recommend this, but it has worked for me several times.
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
norskagent is offline   Reply With Quote
Old 06-01-10, 06:25 AM   #10
TejanoTrackie 
Veteran Racer
 
TejanoTrackie's Avatar
 
Join Date: Jul 2009
Location: Ciudad de Vacas, Tejas
Bikes: 29 frames + 73 wheels
Posts: 10,373
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 232 Post(s)
An effective alternate method that has worked well for me is to strike the end of the chain tool handle with a steel hammer. This applies a short duration very high impact force that will break the cog free. The principle is similar to an impact wrench. I strongly recommend wearing heavy work gloves when doing this.
__________________
What, Me Worry? - Alfred E. Neuman

Quote:
Originally Posted by Dcv View Post
I'd like to think i have as much money as brains.
I see the light at the end of the tunnel, but the tunnel keeps getting longer - me
TejanoTrackie is offline   Reply With Quote
Old 06-01-10, 06:56 AM   #11
kyselad
extra bitter
 
kyselad's Avatar
 
Join Date: Apr 2006
Bikes: Miyata 210, Fuji Royale II, Bridgestone Kabuki, Miyata Ninety
Posts: 1,560
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by egraetze View Post
I bought a Fantom Uno several weeks ago new. It has a flip flop hub. I've wanted to put a smaller sprocket on the fixed side. I've removed the locking ring, but can't get the sprocket to budge at all. I've pulled on my chainwhip tool as hard as I can. I've tried to force the cranks with my front wheel against the wall, and nothing happens. When I first bought the bike, I could feel the sprocket seating in the backward pedal direction. Any suggestions for breaking this free?
Just to make sure there isn't something very basic going wrong here, you previously felt the cog unscrewing when backpedaling, yes? "Seating" makes me think of tightening the cog. Since you have a chainwhip, I'm guessing you understand the threading directions properly, but I figured it's worth verifying that you're going in the right direction.
kyselad is offline   Reply With Quote
Old 06-01-10, 07:00 AM   #12
f50fan
Senior Member
 
Join Date: May 2008
Bikes:
Posts: 174
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Also, if you already felt the cog unthreading and you already have the lockring off, you could try skidding without the lockring on. You may generate enough force to unthread the cog. Thats how I have gotten my cog off before. Jump off the bike before the cog spins out though, because you could damage the threads if the cog is loosely spinning on the hub threads for too long.
f50fan is offline   Reply With Quote
Old 06-01-10, 07:06 AM   #13
TejanoTrackie 
Veteran Racer
 
TejanoTrackie's Avatar
 
Join Date: Jul 2009
Location: Ciudad de Vacas, Tejas
Bikes: 29 frames + 73 wheels
Posts: 10,373
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 232 Post(s)
Quote:
Originally Posted by kyselad View Post
Just to make sure there isn't something very basic going wrong here, you previously felt the cog unscrewing when backpedaling, yes? "Seating" makes me think of tightening the cog. Since you have a chainwhip, I'm guessing you understand the threading directions properly, but I figured it's worth verifying that you're going in the right direction.
Excellent point. The cog unscrews counter-clockwise (lefty-loosey), whereas the lockring unscrews clockwise (righty-loosey). The OP may have been unintentionally tightening the cog instead of loosening it.
__________________
What, Me Worry? - Alfred E. Neuman

Quote:
Originally Posted by Dcv View Post
I'd like to think i have as much money as brains.
I see the light at the end of the tunnel, but the tunnel keeps getting longer - me
TejanoTrackie is offline   Reply With Quote
Old 06-01-10, 07:55 AM   #14
cg1985
Goon
 
Join Date: Jul 2008
Location: Ypsilanti, MI
Bikes: Rocky Mountain RC30, Soma Sport Fixed
Posts: 863
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I guess I just don't understand why people put loctite on their lockring/cog.

In fact I put a little bit of grease on there and then tightened them *****es down. never had a problem.
cg1985 is offline   Reply With Quote
Old 06-02-10, 11:58 AM   #15
egraetze
Junior Member
Thread Starter
 
Join Date: May 2010
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by TejanoTrackie View Post
Excellent point. The cog unscrews counter-clockwise (lefty-loosey), whereas the lockring unscrews clockwise (righty-loosey). The OP may have been unintentionally tightening the cog instead of loosening it.
Thank you for the clarification. The lockring had a left hand thread, so I assumed the same for the cog. I didn't realize that the cog may be on a larger diameter thread. I probably should have looked at the smaller replacement cog. I will try the chainwhip again in the correct direction, then try the trick method to get it off if that doesn't work. I hope I didn't tighten the thing too much now.
egraetze is offline   Reply With Quote
Old 06-02-10, 12:15 PM   #16
Brian
Senior Member
 
Brian's Avatar
 
Join Date: Nov 2004
Location: Between the mountains and the lake.
Bikes: 8 bikes - one for each day of the week!
Posts: 16,683
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That could be an expensive assumption.
Brian is offline   Reply With Quote
Old 06-03-10, 06:52 AM   #17
egraetze
Junior Member
Thread Starter
 
Join Date: May 2010
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Brian View Post
That could be an expensive assumption.
I tried the cog removal making use of the trick method and it worked great. Thanks for the help.
egraetze is offline   Reply With Quote
Old 06-03-10, 07:44 AM   #18
Totaled108
Truck Driver
 
Totaled108's Avatar
 
Join Date: May 2009
Location: Portland, OR
Bikes:
Posts: 328
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Just to clarify, when you take the lockring off, the cog unscrews in the opposite direction the lockring unscrews. When you said you tried taking it off by putting the front wheel against a wall, you were tightening it up more.

Oops, already fixed...

Last edited by Totaled108; 06-03-10 at 07:45 AM. Reason: already answered, but I'll still leave it.
Totaled108 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 02:58 PM.