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 05-30-07, 11:00 AM   #1
exas
Banned.
Thread Starter
 
exas's Avatar
 
Join Date: May 2007
Location: Canada
Bikes:
Posts: 133
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
can i use a gear with missing teeth?



im interested in the smallest one in the pic, would i have any problems if i use that one even though it has a broken tooth?
exas is offline   Reply With Quote
Old 05-30-07, 11:35 AM   #2
rjacob
Senior Member
 
rjacob's Avatar
 
Join Date: Apr 2007
Bikes: 90' Trek 1000, Trek 700 cyclocross conversion, Legnano, 54 Indian Scout, 1980 Trek 412, Zeus Professional?, Raleigh Team USA, Raleigh Technium, Scott Spark 60,...
Posts: 167
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Besides the missing tooth, the cog looks cracked at the base of the next tooth. The smallest cog has had it, and will self distruct if used very much longer.
rjacob is offline   Reply With Quote
Old 05-30-07, 11:48 AM   #3
TallRider
Senior Member
 
TallRider's Avatar
 
Join Date: Oct 2005
Location: Fresno, CA
Bikes:
Posts: 4,118
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
You might be able to get away with it. It's in a worse location on the smallest cog, compared to if it were on the largest cog, because the small cog doesn't have many teeth to begin with.

As rjacob pointed out, it looks as if the cog is cracked, perhaps from impact. I don't think that it will self-destruct, but it probably won't shift well, the chain may hop, and it has the possibility of hurting your chain.

I'd try it - if it works well enough, ride it but watch it to see if the crack worsens.

On the other hand, you can get a new 6-speed freewheel for $20.
TallRider is offline   Reply With Quote
Old 05-30-07, 12:17 PM   #4
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,494
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 125 Post(s)
IF you insist on riding with THAT FW, set the high limit screw so you can't use that cog.
You're going to "gobble up" you chain which will then cause undue wear on the chain rings.

Usually Falcons eat up bearings before something else happens to them. They tend not to be long lived.
I'm not sure if a Shimano or SRAM replacement fits. Falcon MIGHT be a different "animal", with different threading???
Maybe someone knows for sure.
Bill Kapaun is offline   Reply With Quote
Old 05-30-07, 12:38 PM   #5
TallRider
Senior Member
 
TallRider's Avatar
 
Join Date: Oct 2005
Location: Fresno, CA
Bikes:
Posts: 4,118
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
SRAM and Shimano cogs may thread onto the freewheel differently than Falcon, but for replacing the entire freewheel, nearly everything threads the same these days.
TallRider is offline   Reply With Quote
Old 05-30-07, 02:05 PM   #6
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,494
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 125 Post(s)
" nearly everything threads the same these days."
It's the "nearly" part I'm not sure of. I've never seen Falcon FW's for sale other than when installed on a Target or Xmart type bike. Since they are from China, I wouldn't be surprised if they had a proprietory threading or whatever to be used with a "Falcon hub". I know Park sells a removal tool for them, which probably indicates they are worth removing I wouldn't think anybody would remove one, if no "available" FW would fit.
Bill Kapaun is offline   Reply With Quote
Old 05-30-07, 04:07 PM   #7
Gonzo Bob
cycles per second
 
Gonzo Bob's Avatar
 
Join Date: Oct 2003
Location: Minnesota
Bikes: Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
Posts: 1,790
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You can try but it will likely skip a lot whenever you use that cog. I once broke a tooth on a commute to work and the chain would skip on that cog whenever I attempted to accelerate. Since it was a heavily used cog in the middle of the cassette, I replaced it.
Gonzo Bob is offline   Reply With Quote
Old 05-30-07, 06:55 PM   #8
rjacob
Senior Member
 
rjacob's Avatar
 
Join Date: Apr 2007
Bikes: 90' Trek 1000, Trek 700 cyclocross conversion, Legnano, 54 Indian Scout, 1980 Trek 412, Zeus Professional?, Raleigh Team USA, Raleigh Technium, Scott Spark 60,...
Posts: 167
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by timcupery
As rjacob pointed out, it looks as if the cog is cracked, perhaps from impact. I don't think that it will self-destruct, but it probably won't shift well, the chain may hop, and it has the possibility of hurting your chain.
Since the damage is on the smallest cog with the fewest teeth, and the metal is actually cracked (or torn?) on the tooth next to the missing one, I am thinking that crack (or tear) will only get stressed and larger.
rjacob is offline   Reply With Quote
Old 05-30-07, 07:22 PM   #9
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)
I had an XMart bike with a Falcon freewheel. I replaced it with a new wheel with a Shimano freehub from the LBS for under $65.00. Got an 11 tooth cog instead of the 14, and got rid of the wobble the Falcon had.
waldowales is offline   Reply With Quote
Old 05-30-07, 09:40 PM   #10
John E
feros ferio
 
John E's Avatar
 
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
Posts: 17,307
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 139 Post(s)
Quote:
Originally Posted by waldowales
I had an XMart bike with a Falcon freewheel. I replaced it with a new wheel with a Shimano freehub from the LBS for under $65.00. Got an 11 tooth cog instead of the 14, and got rid of the wobble the Falcon had.
That sounds like a reasonable solution.

One could also attempt to ride with the damaged high-gear cog by using it only at high speeds, under very light torque, remembering to downshift either to accelerate or as soon as one's pedal RPMs began to dip.
__________________
"Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1981 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
John E 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 06:31 AM.