Bicycle TutorBicycle Tutor

Show off your bike!

Post Reply 

Crank arm problem

Related video tutorials:
Author Message
Fisher.King Offline
New Member


Posts: 2
Joined: Aug 2010
Post: #1
Crank arm problem
I was tinkering with my bike a couple months ago and while I was test riding it, the right crank arm fell off. I put it back fast because I was in a parking lot and got back on my bike, then realized I didn't line up the left and right arms correctly so now one points forward while the other faces up or down, and neither will come off. After looking online the only solution I found was a tool called a 'crank puller'. It is very cheap, thankfully, but now the only problem I have is not knowing which size to get. If someone knows how to find what size I need, or if there is another solution, I would appreciate the help.

I know the nut and cover-cap thing isn't on in this picture, I forgot to replace them before taking it.

   
Aug 27, 2010 08:33 PM
Find all posts by this user Quote this message in a reply
Bill Offline
Veteran Member

NY,USA
Posts: 2,766
Joined: Sep 2009
Post: #2
RE: Crank arm problem
Ok don't quote on this but I do believe that the park cwp-7 will be the one you need. Sure there are. Other make types but parktools do last a very long time

Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Aug 27, 2010 09:11 PM
Visit this user's website Find all posts by this user Quote this message in a reply
trevgbb Offline
Senior Member

West Midlands UK
Posts: 416
Joined: Apr 2010
Post: #3
RE: Crank arm problem
You say the right side came off? it's usually the left that causes the problems, and this is the one you show in the pic. and this does't appear to have a retaining nut on.
This is a fairly common problem, you should be able to remove this without a special tool except that universal one, the hammer.
Stand on the left of the bike with the crank arm up and rapidly tap the back of the arm, not too hard but quickly and as near to the centre as possible, this will set up a vibration and the arm will usually come off fairly easily, especially as it hasn't been tightened up, you will need a nut to hold it on again and it has to be fitted very tight, or the problem will happen again.
If this doesn't work, I suggest you take it to your LBS, they will do it for you and supply the nut for less than the cost of a tool.
Note that if you ride the bike without the nut and the crank arm becomes loose, you will damage the inside of the locking taper on the arm and need a new arm.
Aug 28, 2010 12:49 AM
Find all posts by this user Quote this message in a reply
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Threaded Left Crank Arm (Pedal thread) square_eyes 7 412 Sep 29, 2014 04:03 AM
Last Post: square_eyes
  Crank Puller ericnwoody 3 309 Aug 27, 2014 06:13 AM
Last Post: ericnwoody
  Broke a Crank Arm ! 1FJEF 18 936 Aug 24, 2014 07:46 PM
Last Post: 1FJEF
  Broken crank arm beave 4 431 Aug 18, 2014 06:20 AM
Last Post: beave
  Replacing crank arms tommywaj 3 1,087 Jul 5, 2014 06:36 AM
Last Post: cny-man
  Older Giant Acapulco Left crank arm falling off dierad53 1 570 Jun 30, 2014 09:13 AM
Last Post: nfmisso
  Thread busted on right pedal crank zippy 35 46,754 Jun 10, 2014 09:21 AM
Last Post: emmanuelr
  New crank? fishboy316 15 1,206 May 25, 2014 10:28 PM
Last Post: fishboy316
  Will a 7-speed freewheel work with a single speed chain and crank? ibie1983 6 741 May 20, 2014 01:30 PM
Last Post: nfmisso
  Noise coming from crank dben2010 2 924 May 20, 2014 11:57 AM
Last Post: DaveM

Forum Jump:


RSS Forum RSS Feeds / Powered by MyBB

ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy

feed