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 04-28-07, 07:43 AM   #1
optimator
The Beer Guy
Thread Starter
 
optimator's Avatar
 
Join Date: Nov 2006
Location: Boulder, CO
Bikes: Redline Conquest Pro
Posts: 62
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ruined crank arm threads....

....We have a Campy crank with the threads where you would screw in the crank arm puller ruined. I've been into bikes for years but I don't recall ever seeing a tool to recut those threads. Can it be done? Thanks - Carl
optimator is offline   Reply With Quote
Old 04-28-07, 09:10 AM   #2
MrCjolsen
Senior Member
 
MrCjolsen's Avatar
 
Join Date: Nov 2004
Location: Davis CA
Bikes: Surly Cross-Check, '85 Giant road bike (unrecogizable fixed-gear conversion
Posts: 3,957
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
I think your crank is toast. Your goal now is to remove the crank and the BB without damaging the frame.

When it happened to me, I was able to unscrew the BB threads on one side. If it's a cup and cone BB, you should be able to do that.

Of course, if you're talking about a crank that is already off the bike, then perhaps you might be able to use it as a meat tenerizer.
MrCjolsen is offline   Reply With Quote
Old 04-28-07, 01:14 PM   #3
Grand Bois
Senior Member
 
Grand Bois's Avatar
 
Join Date: Mar 2005
Location: Pinole, CA, USA
Bikes:
Posts: 16,696
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 90 Post(s)
How hard did you try to find that tool?
http://www.biketoolsetc.com/index.cg..._id=VR-PE11000
Grand Bois is offline   Reply With Quote
Old 04-28-07, 04:08 PM   #4
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,322
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
Quote:
Originally Posted by Dirtdrop
How hard did you try to find that tool?
http://www.biketoolsetc.com/index.cg..._id=VR-PE11000
Well, unless he can locate a shop with that tool it would be foolish to spend more on the tool than on a new crankset. I know that there once existed a tool that would cut new threads if there was enough metal left but don't know if it still exists. I'll have a look. A car mechanic may be able to rig a pulley remover to pull off the crank.
cny-bikeman is offline   Reply With Quote
Old 04-28-07, 04:12 PM   #5
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,322
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
Here is the thread chasing tool. Note that this will only repair minor damage. If someone has actually pulled the threads out by not engaging the tool completely this will likely not help. http://www.bicycleresearchtools.com/...l#anchor350490
cny-bikeman is offline   Reply With Quote
Old 04-28-07, 05:28 PM   #6
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Or this set (here too) to re-cut the threads on the bike and use them to pull the arm off?
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 04-28-07, 05:38 PM   #7
pigiron
Member
 
Join Date: Feb 2007
Bikes:
Posts: 29
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
hacksaw: http://forums.mtbr.com/showthread.php?t=291321
pigiron is offline   Reply With Quote
Old 04-28-07, 05:48 PM   #8
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,920
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 96 Post(s)
Quote:
Originally Posted by DMF
Or this set (here too) to re-cut the threads on the bike and use them to pull the arm off?
A $150 tool for one repair? Yeah it probably works but you would need to resurrect a lot of cranks to justify buying one. I don't think many LBS's will have one either.

I think from an economic standpoint the current crank isn't worth saving and just be more careful with the replacement.
HillRider is online now   Reply With Quote
Old 04-28-07, 05:54 PM   #9
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A cool tool is its own justification.
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 04-29-07, 07:55 AM   #10
n4zou
Scott
 
n4zou's Avatar
 
Join Date: Jun 2006
Bikes: Too Many
Posts: 2,393
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Loctite "Form A Thread" will take care of your problem. Here is the link to get you started.
http://68.72.74.113/USERFORUM/forum3.htm
n4zou 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 10:02 AM.