Some Caveats


This method has been useful to me a number of times, with the problem of unyielding crank arms. With s bike stand, you only have so much force you can use with one arm. You may find that you are rotating your crank puller ( with a wrench  ) but have come to a point where you no longer can get the leverage to help turning it. Some people may use a mallet in this case, but I find the method in the video more effective.


When any great force is being applied to bikes, or any mechanical device for that matter, it’s important to make sure:

  • that it’s worth doing it
  • you don’t break something else in the process
  • you don’t cause yourself injury


In this case, the crankset needed to come off because it was so dirty. The other alternative was to take off the chain rings while leaving the spider fixed onto the spindle. However, with this unusual Thun Silverton crank, that idea wasn’t an option; it doesn’t have any chain bolts, and the rings are fixed and unremovable. Who came up with that stupid idea?


Tools and Technique


  • Large adjustable wrench
  • Crank tool puller


It’s very important to keep the bike secure as you apply the force with your foot. Otherwise, the chances of an accident increase exponentially. Most of all, protect the frame and the other crank arm. Using a large block of wood instead of the cinder block I used would offer a better safeguard against damage, as even the slightest graze of bare metal against the cinder block could ruin the frame. Nevertheless, a cinder block is heavy and grips to the ground, which is ideal in this case. Good luck!



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