Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Can't get those cranks loose

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.

Can't get those cranks loose

Old 06-26-06, 07:32 AM
  #1  
purple hayes
Senior Member
Thread Starter
 
purple hayes's Avatar
 
Join Date: Dec 2001
Location: Atlanta, Georgia
Posts: 230
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Can't get those cranks loose

I'm getting a popping noise from my cranks/bb when I stand to pedal.

I want to take off the cranks and bb for a clean and re-install, but I can't budge the bolts that hold the cranks on.

Any suggestions? I'd hate to take it to a shop for something so simple.

It's a Giant OCR Touring bike with Truvativ cranks if that matters.
purple hayes is offline  
Old 06-26-06, 08:29 AM
  #2  
KevinF
Keep on climbing
 
Join Date: Apr 2004
Location: Marlborough, Massachusetts
Posts: 2,179

Bikes: 2004 Calfee Tetra Pro

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Brace one of the pedals underneath or against a large heavy immobile object -- i.e., a wall or underneath a car. Position the wrench for proper leverage (i.e., straight up and down seems to work for me -- then you can pull on it while leaning backwards).
KevinF is offline  
Old 06-26-06, 09:21 AM
  #3  
Dostoy
Senior Member
 
Dostoy's Avatar
 
Join Date: May 2005
Location: minneapolis
Posts: 93
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If you can secure the cranks like Kevin suggested, slipping a piece of pipe over the end of the wrench to extend the handle length will give you the needed leverage.
Dostoy is offline  
Old 06-26-06, 12:18 PM
  #4  
Peek the Geek
is slower than you
 
Peek the Geek's Avatar
 
Join Date: Jan 2005
Location: WI
Posts: 1,486

Bikes: Gunnar Sport, Marin Pine Mountain, Gunnar Ruffian, Gunnar Roadie, BMC Fourstroke, Salsa Vaya

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Rotate crank to 3 o'clock position.
Position wrench so that the handle sticks out at the 9 o'clock position.
Carefully stand on wrench with left foot and on crank with right foot.
Gently bounce up and down until bolt comes free.

(NOTE: Not responsible for any bodily harm this might cause if things go wrong. )
__________________
Proud supporter of the Chippewa Off-Road Bike Association (CORBA)
www.chippewaoffroad.org

Peek the Geek is offline  
Old 06-26-06, 03:14 PM
  #5  
Old Hammer Boy
Senior Member
 
Old Hammer Boy's Avatar
 
Join Date: Aug 2005
Location: Utah
Posts: 1,082

Bikes: Trek, Cannondale Tandem, Surly LHT

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Make sure you have removed any washers that may be in the way.
Old Hammer Boy is offline  
Old 06-26-06, 03:44 PM
  #6  
Peek the Geek
is slower than you
 
Peek the Geek's Avatar
 
Join Date: Jan 2005
Location: WI
Posts: 1,486

Bikes: Gunnar Sport, Marin Pine Mountain, Gunnar Ruffian, Gunnar Roadie, BMC Fourstroke, Salsa Vaya

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Old Hammer Boy
Make sure you have removed any washers that may be in the way.
If he can't get the bolts off, he hasn't gotten this far yet.
__________________
Proud supporter of the Chippewa Off-Road Bike Association (CORBA)
www.chippewaoffroad.org

Peek the Geek is offline  
Old 06-26-06, 04:01 PM
  #7  
Mothra
Senior Member
 
Join Date: Jun 2006
Posts: 373
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Use a real wrench for once! Those tiny 6" double-sided Park tools for crankarms isn't gonna give you enough leverage! Use an automotive 3/8" drive ratchet-wrench with 12" handle and it'll come off easily! Also use that size torque-wrench to re-install the crank-arm bolts.
Mothra is offline  
Old 06-26-06, 04:49 PM
  #8  
Fredmertz51
Senior Member
 
Fredmertz51's Avatar
 
Join Date: Oct 2004
Location: Iowa
Posts: 335

Bikes: Actual 10-speed Olmo road, Bianchi BUSS, Kona A-Ha, Schwinn Moab 2 rain bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Good luck, I've got a good schwinn moab frame stripped except for the crankset in the garage because I couldn't get the bolts loose. Tried all kinds of cheater bars, took the bike to the LBS,they shrugged their shoulders, and finally used an impact wrench which stripped the flats inside the allen bolt. Burnt up $20 worth of carbon? drills trying to drill out the bolts, and am unable to even get a hacksaw blade between the crankset and the frame to saw off the spindle. Really liked the frame too.
Fredmertz51 is offline  
Old 06-26-06, 08:58 PM
  #9  
Old Hammer Boy
Senior Member
 
Old Hammer Boy's Avatar
 
Join Date: Aug 2005
Location: Utah
Posts: 1,082

Bikes: Trek, Cannondale Tandem, Surly LHT

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Fredmertz51
Good luck, I've got a good schwinn moab frame stripped except for the crankset in the garage because I couldn't get the bolts loose. Tried all kinds of cheater bars, took the bike to the LBS,they shrugged their shoulders, and finally used an impact wrench which stripped the flats inside the allen bolt. Burnt up $20 worth of carbon? drills trying to drill out the bolts, and am unable to even get a hacksaw blade between the crankset and the frame to saw off the spindle. Really liked the frame too.
A bit brutal, but how about cutting off the crank arms and having a go at it with a Sawsall? It sounds like you don't have much to lose.
Old Hammer Boy is offline  
Old 06-26-06, 09:01 PM
  #10  
Old Hammer Boy
Senior Member
 
Old Hammer Boy's Avatar
 
Join Date: Aug 2005
Location: Utah
Posts: 1,082

Bikes: Trek, Cannondale Tandem, Surly LHT

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Peek the Geek
If he can't get the bolts off, he hasn't gotten this far yet.

Right you are. For some reason my mind was fixed on pulling the cranks. I've never had a problem with the bolts, but I use a good, long socket wrench for the task and alway grease the threads upon re-installation. I left a washer in one time and played hell pulling the crank. Kinda like standing on a board while trying to pick it up.
Old Hammer Boy is offline  
Old 06-26-06, 09:04 PM
  #11  
MudPie
Senior Member
 
MudPie's Avatar
 
Join Date: May 2004
Location: Southern California
Posts: 1,874
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
One word: leverage.

If you can take the pedals off, you can slip a large diameter pipe over the crank arm and use a socket (3/8" drive) with breaker bar - the longer the better. Wrap the crank arm in a towel/rag before slipping the pipe over it.

You also might want to drip some penetrating oil into the interface, in hopes of getting some into the threaded area.

I guarantee you'll be satisified when that bolt breaks free!
MudPie is offline  
Old 06-27-06, 08:39 PM
  #12  
SD_Joe
Junior Member
 
Join Date: Jun 2004
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Fredmertz51
Good luck, I've got a good schwinn moab frame stripped except for the crankset in the garage because I couldn't get the bolts loose. Tried all kinds of cheater bars, took the bike to the LBS,they shrugged their shoulders, and finally used an impact wrench which stripped the flats inside the allen bolt. Burnt up $20 worth of carbon? drills trying to drill out the bolts, and am unable to even get a hacksaw blade between the crankset and the frame to saw off the spindle. Really liked the frame too.
I had a similar problem with a Truvativ crank and rounded off the allen bolt. I ended up drilling it out with a nice fresh bit and using an easy out. Got the bit and easy out from Home depot for about $10. I ended up using a long Crescent wrench on the easy out and eventually got the bolt out. I could feel the easy out twisting through.
SD_Joe is offline  
Old 06-27-06, 10:54 PM
  #13  
Mothra
Senior Member
 
Join Date: Jun 2006
Posts: 373
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by SD_Joe
I had a similar problem with a Truvativ crank and rounded off the allen bolt. I ended up drilling it out with a nice fresh bit and using an easy out. Got the bit and easy out from Home depot for about $10. I ended up using a long Crescent wrench on the easy out and eventually got the bolt out. I could feel the easy out twisting through.
That's scary. If you had snapped off the EasyOut in the drilled-out bolt, you'd be in even bigger trouble! In which case, you can drill out the super-hard EasyOut with a masonry drill-bit, use lots of cutting oil...
Mothra is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mainstreetexile
Classic & Vintage
9
09-11-11 05:41 PM
Chris s
Mountain Biking
3
03-22-10 05:50 AM
Fuse4
BMX
4
11-16-07 05:01 AM
WheresWaldo
Road Cycling
17
04-18-07 03:23 AM
mattkime
General Cycling Discussion
2
10-10-06 10:58 AM

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.