Can’t get the crank arms off of this bike. Tried a crank puller for a while. I was able to get it fully in and to the point I couldn’t turn it anymore. Applied tension and eventually it just popped back out. Any ideas?
If you stripped the threads on the crank arm you‘re most likely in for a new crank. You probably wont be able to take it off without damaging the crank beyond repair.
fonironi on
Share a picture of the end of your crank puller? It looks like its not the right shape? The end might be too large and is causing the inside of your cranks to deform (the silver part)
bikepackerWill on
I’m not being funny, I had to go full musculoskeletal when I ripped my old cranks using a puller. The amount of pressure you need to force — all while being terrified that it will release (pushing your tensioned hand into the teeth of the chainring) — is honestly insane.
I blurted out a noise that I have never repeated.
sar_tr on
Looks like you used an octalink puller instead of a square taper extractor, which has a bigger push shaft which won’t fit through the square taper hole, so you were just cranking the tool against the inside of the crank (see where it is worn away in a circle around the square taper hole). If it isn’t completely stripped in the crank then you might get lucky with a square taper extractor. Otherwise you go for the dodgy ride until it loosens by itself (if it does in a short enough time frame) or you get busy with a dremel. You can get extractors that clamp to the crank, but it’s a specialist bit of kit that your lbs might or might not have.
samquam on
If you stripped the threads, it might be approaching “destructive disassembly” time.
Top-Yogurtcloset5272 on
Ok so I cut one crank off fully with an angle grinder, do I now need to cut the second one off, I’m replacing the whole mechanism
Weird-Indication-191 on
put your chain back on and ride it around the block. it will come loose
7 Comments
If you stripped the threads on the crank arm you‘re most likely in for a new crank. You probably wont be able to take it off without damaging the crank beyond repair.
Share a picture of the end of your crank puller? It looks like its not the right shape? The end might be too large and is causing the inside of your cranks to deform (the silver part)
I’m not being funny, I had to go full musculoskeletal when I ripped my old cranks using a puller. The amount of pressure you need to force — all while being terrified that it will release (pushing your tensioned hand into the teeth of the chainring) — is honestly insane.
I blurted out a noise that I have never repeated.
Looks like you used an octalink puller instead of a square taper extractor, which has a bigger push shaft which won’t fit through the square taper hole, so you were just cranking the tool against the inside of the crank (see where it is worn away in a circle around the square taper hole). If it isn’t completely stripped in the crank then you might get lucky with a square taper extractor. Otherwise you go for the dodgy ride until it loosens by itself (if it does in a short enough time frame) or you get busy with a dremel. You can get extractors that clamp to the crank, but it’s a specialist bit of kit that your lbs might or might not have.
If you stripped the threads, it might be approaching “destructive disassembly” time.
Ok so I cut one crank off fully with an angle grinder, do I now need to cut the second one off, I’m replacing the whole mechanism
put your chain back on and ride it around the block. it will come loose