Originally Posted by
HillRider
That's exactly how it works on Shimano self-extracting cranks. The bolt is loosened with an 8 mm hex key and after the first turn or so it gets tight as it butts up against then outer ring. Keep turning the hex wrench and the entire arm comes off.
A standard square taper extractor won't work as this is a hollow Octalink spindle. You need the appropriate Park tool or Shimano tool with the wide screw press tip or the Shimano "mushroom" TL-FC15 if you remove the outer ring first.
Yeah, I've had those cranks a long time ago. The Shimano crank tool has the correct pin spacing for the "dust cover" and the other end is for the chain ring bolts.
The main problem you'll find is if you sweat on it a lot, the outer ring will corrode into the arm and it's a batch to remove.